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Acknowledgements

General Motors, the IAGMASEP Association Board of Directors, and Raytheon Professional

Services, GM's training partner for GM's Service Technical College wish to thank all of the

people who contributed to the GM ASEP/BSEP curriculum development project 2002-3. This

project would not have been possible without the tireless efforts of many people. We

acknowledge:

The IAGMASEP Association members for agreeing to tackle this large project to create

the curriculum for the GM ASEP/BSEP schools.

The IAGMASEP Curriculum team for leading the members to a single vision and

implementation.

Direct contributors within Raytheon Professional Services for their support of translating

a good idea into reality. Specifically, we thank:

Chris Mason and Vince Williams, for their leadership, guidance, and support.

Media and Graphics department under Mary McClain and in particular, Cheryl

Squicciarini, Diana Pajewski, Lesley McCowey, Jeremy Pawelek, & Nancy

DeSantis.

For his help on the Electrical curriculum volume, Subject Matter Expert, Ken Beish,

Jr., for his wealth of knowledge.

Finally, we wish to recognize the individual instructors and staffs of the GM ASEP/BSEPColleges for their contribution for reformatting existing General Motors training material, adding

critical technical content and the sharing of their expertise in the GM product. Separate

committees worked on each of the eight curriculum areas. For the work on this volume, we

thank the members of the Electrical committee:

Jack Davis, Community College of Baltimore County - Catonsville

Jim Halderman, Sinclair Community College

Megan Kuehm, Community College of Allegheny County

Frank Longbottom, Camden County College

Jeff Rehkopf, Florida Community College at Jacksonville

Randy Peters, Des Moines Area Community College

David Rodriguez, College of Southern Idaho

Ed Schauffler, Longview Community College

Vince Williams, Raytheon

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Contents

Module 19 Accessories

Acknowledgements .............................................................................................. 2Introduction .......................................................................................................... 4

Lesson 1. Cruise Control .....................................................................................................6

Multi-Function Turn Signal Lever ..........................................................................................7

Diagnostic Aids ................................................................................................................... 14

Cruise Control Description With Electronic Throttle Control ...............................................15

Lesson 2. Rear Window and Mirror Defogger.....................................................................18

Lesson 3. Power Windows .................................................................................................20

Lesson 4. Power Door Locks with Keyless Entry ...............................................................23

Lesson 5. Module Controlled Power Windows ...................................................................26

Lesson 6. Module Controlled PowerLocks ..........................................................................30

Labsheet 1 ..........................................................................................................................36

Cruise Control .....................................................................................................................36

Labsheet 2 .........................................................................................................................38

Defogger .............................................................................................................................38

Labsheet 3 ..........................................................................................................................40

Power Windows and Locks (without Door Modules) ...........................................................40

Labsheet 4 ..........................................................................................................................42

Power Windows and Locks (Module Equipped Doors) .......................................................42

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2002 General Motors Corporation

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Student WorkbooIntroduction

NATEF Tasks VI.H.

Accessories Diagnosis and Repair

1. Diagnose incorrect operation of motor-driven accessory circuits;

determine necessary action.

2. Diagnose incorrect heated glass operation; determine necessary

action.

3. Diagnose incorrect electric lock operation; determine necessary action.

4. Diagnose incorrect operation of cruise control systems; determine

necessary action.

8. Remove and install door panel.

Cruise Control Lab Objectives

apply principles of stepper motors and controls

use service information to locate, remove, and replace components

read electrical schematics

make measurements with DVOM

make necessary adjustments

operate J 42958 Cruise Control Tester

Defog Lab Objectives apply principles of series and parallel circuits

use service information to locate components



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Student WorkbooPower Windows and Door Locks Lab Objectives

apply principles of motor controls





Module Controlled Power Windows and Door Locks Lab Objectives





operate a Tech 2 to display data

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Student WorkbooLesson 1. Cruise Control

Cruise control is a speed control system that maintains a desired vehicle

speed under normal driving conditions. Steep grades up or down may

cause variations in the selected speeds. The cruise control system has

the following capabilities:

Cruise

Coast

Resume Speed

Accelerate

Tap-Up

Tap-Down

Caution:

Do not use the cruise control on slippery roads,

steeply graded roads, or in heavy traffic of heavy

or varying volume. Failure to follow these

CAUTIONS could possibly cause you to loose

control of the vehicle and result in damage to the

vehicle and personal injury;

Figure 19-1,

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Student WorkbooThe cruise control system consists of the following main components:

The multi-function turn signal lever The multi-function turn signal lever

includes an ON-OFF-R/A switch and a SET/COAST switch

The cruise control module

The cruise control cable

The vehicle speed sensor The cruise control release switch The cruise control switch disengages

the cruise system.

The stoplamp switch The stoplamp switch disengages the cruise

system.

The cruise control release and the stoplamp switches are mounted on the

brake pedal bracket. When the brake pedal is depressed, the cruise

control system is electrically disengaged by these switches. The throttle

returns to the idle position.

Multi-Function Turn Signal Lever

OFF-ON-R/A Switch

The OFF-ON-R/A switch has the following 3 positions:

The ON position The ON position

turns the cruise control system ON.

The OFF position The OFF position

turns the cruise control system OFF.

The R/A position The R/A switchposition has the following 3 main

functions:

Resume The system will enter the resume mode when the OFF-

ON-R/A switch is held in the R/A (Resume/Accelerate) position

momentarily. The vehicle speed must exceed 40 km/h (25 mph) at

the time of activation in order for the cruise control operation to

return to the last cruise speed setting.

Accelerate The system will enter the accelerate mode when the

OFF-ON-R/A switch is held in the R/A position for more than one

second. To increase the cruise speed, the vehicle must be travelingat least 40 km/h (25 mph) and the ON-OF-R/A switch held in the

R/A position until the vehicle reaches the desired cruise speed. The

system will maintain the new cruise speed when the OFF-ON-R/A

switch is released to the ON position.

Figure 19-2,

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Student Workboo Tap-Up This function increases the cruise speed by increments of

2 km/h (1 mph). One tap equals a 2 km/h (1 mph) increase. The

cruise must be engaged and operating in order to use this function.

Press the OFF-ON-R/A switch toward the R/A position and release

quickly or tap the lever in order to operate the tap-up function. Do

not hold the lever in the R/A position or the system will go into the

accelerate mode.

SET/CRUISE Button Switch

The cruise control SET/CRUISE button switch is located in the end of the

multi-function turn signal lever. The SET/CRUISE button switch has the

following 3 main functions:

Set

Coast

Tap-Down

The cruise speed sets when the following actions occur:

The SET/CRUISE button switch is depressed and released.

The OFF-ON-R/A switch is in the ON position.

The vehicle speed exceeds 40 km/h (25 mph).

The cruise speed sets at the speed at which the vehicle is traveling when

the button is released. The cruise speed will be within 2 km/h (1 mph) of

the engaged speed.

The system will cruise until one of the following actions occurs:

The OFF-ON-R/A switch is moved to the OFF position.

The brake pedal is pressed.

The ignition switch is turned to the OFF position.

The driver can decrease the cruise speed by completing the following

actions:

Fully depress and hold the SET/CRUISE button switch. This action

disengages the cruise system and allows the throttle to return to the

idle position.

When the vehicle slows to the desired cruise speed, release the SET/CRUISE button switch. This action will set the new cruise speed.

The tap-down function permits the driver to decrease the cruise speed in

increments of 2 km/h (1 mph). One tap equals a 2 km/h (1 mph) decrease.

The cruise must be engaged and operating in order to use this function.

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Student WorkbooPress and quickly release or tap the SET/CRUISE button switch in order

to operate the tap-down function. Holding the SET/CRUISE button inward

will cause the system to go into the CRUISE mode.

Press the accelerator at any time in order to override the cruise system.

The vehicle will return to the last set cruise speed after the accelerator is

released.

When the slider switch is moved to the ON position, the battery voltage isapplied through circuit 397 to terminal A of the cruise control module

connector.

When the slider switch is moved to the ON position, the battery voltage is

applied through circuit 397 to terminal A of the cruise control module

connector.

When the slider switch is moved to the R/A (Resume/Accelerate) position,

the battery voltage is applied through circuit 87 to terminal C of the cruise

control module.

With the SET switch pressed, the battery voltage is present through circuit

84 to the cruise control module terminal B.

Figure 19-3,

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Student WorkbooCruise Control Module

The cruise control system uses a cruise control module to obtain and hold

any desired vehicle cruise speed above a minimum speed of 40 km/h (25

mph). The module contains the following 2 components:

An electronic controller The electronic controller monitors the following

operations:

The vehicle speed

The multi-function turn signal lever

The cruise control release inputs

The brake switch inputs

Operates the electric stepper motor

A stepper motor: The stepper motor moves the internal band in

response to the controller in order to maintain the desired cruise

speed. The internal band is linked to the throttle lever via the cruise

control cable.

Figure 19-4,

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Student Workboo

Figure 19-5,

Figure 19-6,

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The ignition voltage is supplied from the CRUISE Fuse, through circuit

341 to terminal F of the cruise control module. The cruise control module

receives ground at terminal E, through circuit 1750 and from G201.

The cruise control module terminal J is used to signal the powertraincontrol module (PCM) when the cruise control is engaged through circuit

85. The PCM will then determine the correct shift pattern for the

transmission.

Cruise Control Cable

The cruise control cable is adjustable. The cable provides a physical

connection between the cruise control module and the engine throttle

lever.

Figure 19-7,

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Student WorkbooVehicle Speed Sensor

The vehicle speed sensor (VSS) is mounted to the automatic transaxle.

The VSS provides a low voltage alternating current (AC) signal to the

powertrain control module (PCM). The PCM converts the AC signal to a

pulse width modulated direct current (DC) signal. The signal is sent to the

cruise control module at a rate of 4,000 pulses per mile.

The cruise control module terminal K is the speed signal terminal throughcircuit 817. In operation, the voltage will oscillate between a high of 4-5

volts and a low of near ground.

Cruise Control Release Switch and Stoplamp Switch

The cruise control release switch and the stoplamp switch are used in

order to disengage the cruise control system. The switches are mounted

on the brake pedal bracket in order to disengage the system electrically

when the brake pedal is pressed.

The brake pedal interrupts the flow of current to the cruise control module.The cruise speed of the vehicle at brake actuation will be stored in the

cruise control module memory.

If the brake pedal is not pressed, battery voltage is present from circuit

341 through the cruise control release switch and circuit 86 to the cruise

control module terminal D.

If the brake pedal is depressed, battery voltage is supplied from the STOP

LAMP Fuse, through circuit 140, the stop lamp switch and circuit 17 to the

cruise control module terminal G.

Terminal G needs current flow through the center high-mounted stop lamp

(CHMSL) bulbs in order to enable the cruise to operate (disable) properly.

Improper cruise control operation can be caused by mechanical or

electrical problems. Perform the following inspections in order to resolve

any cruise control operating concerns:

Inspect the cruise control wiring for bare or broken wires.

Inspect for loose or backed-out terminals.

Inspect for a properly adjusted cruise control cable. Refer to Cruise

Control Cable Adjustment.

If the preliminary inspections do not resolve the concerns or the systemremains inoperative, refer to Diagnostic System Check - Cruise

Control.

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Student WorkbooDiagnostic Aids

To avoid misdiagnosis:

Inspect for proper operation of the brake lamps (center high mount

stoplamp).

Inspect throttle linkage for mechanical binding which could cause the

system to malfunction.

Inspect cruise control cable for adjustment, should have minimum

slack.

Inspect for stored Diagnostic Trouble Codes (DTC's in the PCM). Refer

to Powertrain OBD System check in Engine Controls.

EMI on the speed sensor signal circuit may cause erratic cruise control

operation.

Conditions for Enabling Cruise Control

When vehicle speed is more than 40 km/h (25 mph)

When PARK, REVERSE, NEUTRAL, or 1st gear IS NOT indicated by

the Park / Neutral Position Switch.

When an over / undercharged battery condition DOES NOT exist.

With normal engine RPM.

Without high engine RPM (fuel cut-off). Refer to Fuel Metering Modes

of Operation

The cruise control module terminal H is used by the PCM through circuit

83 in order to inhibit the cruise control when the conditions areinconsistent with the cruise operation are present.

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Student WorkbooCruise Control Description With Electronic Throttle Control

(2001 Corvette Shown)

Cruise control is a speed control system that maintains a desired vehicle

speed under normal driving conditions. However, steep grades may cause

variations in the selected speeds. The electronic cruise control system has

the capability to CRUISE, COAST, RESUME SPEED, ACCELERATE, and

TAP-UP or TAP-DOWN.

The main parts of the cruise control system are:

The Throttle Actuator Control (TAC) Module

The function control switches

The stoplamp switch assembly

The TCC Brake switch assembly

The clutch pedal position sensor (CPP) if equipped

The cruise control system uses the TAC module to maintain the desired

vehicle cruise speed and operation. The TAC and the powertrain controlmodule (PCM) communicate together to vary the throttle opening in each

different cruise control mode. The PCM monitors vehicle speed and

operates the throttle actuator. The throttle actuator operates in response

to the TAC module, to maintain the desired cruise speed. The throttle

actuator motor moves the throttle blade. The PCM assembly contains a

low speed limit which will prevent system engagement below a minimum

speed of 40 km/h (25 mph). The TAC or PCM module assembly are not

serviceable.

Figure 19-8,

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The stop lamp switch, TCC Brake switch or CPP switch if equipped, is

used to disengage the cruise control. A cruise control release switch circuitand a stoplamp switch circuit are used. The stop lamp, TCC Brake and

CPP switches are mounted to the brake pedal bracket . To disengage the

system the driver presses the brake pedal or clutch pedal, if equipped.

The speed of the vehicle at brake actuation will be stored in the memory

of the TAC module.

With cruise control, the vehicle can maintain a speed of about 40 km/h (25

mph) or more without keeping your foot on the accelerator. When the

driver turns off the cruise control ON/OFF switch or ignition switch, the

cruise control turns off. The vehicle speed stored in the memory of the

TAC module will be lost.

The operation of the TAC module is through the function control switches

located on the multifunction turn signal lever. The cruise control function

control switches includes the ON/OFF, SET/COAST, R/A (resume/

accelerate). The switch assembly provides driver control of the cruise

control system.

Figure 19-9,

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Student WorkbooIgnition positive voltage is supplied from the throttle control fuse, to the

TAC module. The TAC module is grounded to G106. When the cruise

control ON/OFF switch is on, ignition positive voltage is applied to the

cruise on switch signal terminal of the TAC module. If the driver has not

pressed the brake pedal or clutch pedal if equipped, ignition positive

voltage is supplied through the switches, to the cruise control brake pedal

switch signal and clutch signal, if equipped, terminals of the PCM. Cruise

control is canceled when the driver presses either the brake pedal orclutch pedal, if equipped. The stop lamp switch closes, applying battery

positive voltage to the stop lamp signal circuit of the TAC module. Voltage

is also removed from the brake pedal signal circuit and the clutch switch

signal circuit, if equipped, at the PCM. When pressing the SET/COAST

button on the multifunction turn signal lever, ignition positive voltage is

applied to the set/coast switch signal terminal of the TAC module. When

pressing the R/A (resume/accelerate) on the control switch, ignition

positive voltage is applied to the resume/accelerate switch signal terminal

of the TAC module.

When the cruise switch is in the ON position, and the driver presses theSET/COAST button, the TAC module notifies the PCM that the cruise

control is requested. The PCM then checks to see that the cruise control

enable criteria is met. If the cruise control criteria has been met the PCM

sends a class 2 message to the instrument panel cluster (IPC) to

illuminate the cruise light, if equipped

The PCM will inhibit cruise control:

When vehicle speed is less than 40 km/h (25 mph).

When in PARK, REVERSE, NEUTRAL, or 1st gear.

With low engine RPM With high engine RPM (fuel cut-off)

When vehicle speed is to high

When an over or under charged battery voltage condition exists

Antilock brake system/traction control system is active for more than 2

seconds

A 6 MPH or more decrease in non-drive wheel speed in 0.4 seconds

with out seeing the extended brake travel contacts of the TCC/Brake

switch transition.

If the PCM determines that any of the cruise control inhibit conditions are

present, the PCM will disengage the cruise control. The PCM

accomplishes this through data communication with the TAC module. If

the PCM disables the cruise control for an inhibiting event it will record the

reason for disengagement in the Disengage Definition data file.

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Student WorkbooLesson 2. Rear Window and Mirror Defogger

The defogger circuit contains the following main components:

Heater AC control

Rear window defogger relay

Rear window defogger grid

Left and right outside rearview mirrors

The Rear Window Defogger operates when power is applied to the defog

grid in the rear glass. This grid consists of high resistance wiring that heats

with the flow of electricity and the heats the glass to reduce or eliminate

fog/condensation on the rear glass.

A solid state timer controls the battery voltage from the fuse through a

relay. Voltage is momentarily applied to the timer. The voltage activates

the relay that controls the rear window defogger grid when the rear

defogger switch is pressed.

Figure 19-10,

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Student WorkbooWhen the ignition switch is turned to the RUN position, voltage is applied

from the HVAC fuse through circuit 41(BRN) to the following components:

The rear window defogger relay

The heater-A/C control

The rear window defogger relay receives battery voltage from the REAR

DEFOG circuit breaker through circuit 1040 (ORN). When the rear

defogger switch is pressed, voltage is momentarily applied to the solidstate timer, sending a ground signal to the rear window defogger relay

through circuit 193 (WHT). This action activates the relay which causes

the relay contacts to close sending voltage from circuit 1040 (ORN)

through to circuit 293 (PPL). This action sends voltage to the rear

defogger grid which is receiving ground from G401 through circuit 450

(BLK), causing the rear defogger grid to heat. This relay remains closed

until one of the following conditions exist:

The defog cycle is complete.

The rear defogger switch is pressed a second time.

The defog cycle lasts 10 minutes when the following conditions exist:

The ignition switch is turned to the RUN position.

The rear defogger switch is pressed for the first time.

Any further operation will result in 5 minute defog cycles. The defog cycle

is reset to 10 minutes when the ignition switch is turned to the OFF

position and back to the RUN position.

The defogger ON indicator is an LED that illuminates when the rear

defogger is ON.

Radio Noise Suppression

A radio noise suppression wire is provided at connector C 3 of the rear

window defogger grid to prevent the defogger from causing static during

the operation of the radio.

Outside Rearview Mirrors

In addition to providing power to the rear defogger grid, circuit 293 (PPL)

also provides power to the Heated Mirror fuse in the fuse block. From theHeated Mirror fuse voltage is applied to the LH and RH outside rearview

mirrors through circuit 267. These mirrors are connected to ground

through circuit 750 (BLK) and ground G301. This causes the defogger in

the LH and RH Outside Rearview Mirrors to heat the mirrors and defog

them. The operating time duration is the same as the rear window defog

cycle.

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Student WorkbooLesson 3. Power Windows

The power window circuit contains the following main components:

Master window switch

Left rear window switch

Right rear window switch

Left and right front window motor

Left and right rear window motor

Each power window is connected to a permanent magnet motor. The

motor raises or lowers the glass when a switch applies voltage and ground

to the motor. The direction the motor turns depends on the polarity of the

supply voltage and ground.

Figure 19-11,

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Student WorkbooMaster Window Switch

When the ignition switch is in the RUN position, the battery voltage is

applied to the master window switch through circuit 141. The switch

assembly is grounded through circuit 150. When you operate any master

window UP switch that is not associated with express down, the battery

voltage is applied to the window motor. The motor grounds through the

Down contact in the master window switch. The motor drives the window

up.

When you press Down past the first detent on any master window Down

switch, the battery voltage is applied to the window motor in the opposite

direction. The motor grounds through the UP contact in the master window

switch. The motor drives the window down.

Express Down Feature

When you press the left front window switch to the first detent in the

DOWN position, the following actions occur:

1. The express circuit within the master window switch engages.

2. The express circuit applies voltage to circuit 165.

3. The left front window moves to the fully open position.

When the left front window reaches the mechanical limit, the current

drawn to the motor increases significantly. The express down circuits in

the master window switch perform the following functions:

1. The circuits sense this current draw.

2. The circuits remove power to the power window.

Figure 19-12,

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Student WorkbooRear Windows

The rear window switches are tied in a series circuit to the master window

switch. At rest, each switch contact is tied to ground through the master

window switch. When the master window switch operates a rear window,

battery voltage is applied to one side of the associated rear window motor.

The motor drives the window in the corresponding direction.

When you operate a rear window switch, battery voltage is applied to therear power window motor through CKT 1307. The motor drives the window

in the corresponding direction.

Each motor is protected by a built-in electronic circuit breaker PTC. The

PTC resistance increases under the following conditions:

If you hold a window switch too long with the window obstructed

After the window is fully up or down

The resistance returns to normal after the voltage is removed from the

motor terminals.

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Student WorkbooLesson 4. Power Door Locks with Keyless Entry

The power door locks with keyless entry circuit contain the following main

components:

Body control module (BCM)

Door lock switches

Lock/unlock relay

Door lock motors

Keyless entry transmitter

The power door lock system can be operated in two different ways. The

door lock/unlock relay controls the power door locks with keyless entry.

The body control module (BCM) operates the system with the transmitter.

The door lock switches an also operate the system

Each switch contains a pair of contacts which are normally open. The

locks are operated by reversible motors. The switches and the BCM

operate the relays by providing voltage to the coil of the appropriate relay.The relays operate the motors by providing voltage and ground. Each

motor contains a solid state circuit breaker to prevent overheating and

damage to the motor.

When a door lock switch is depressed, voltage is provided through the

closed contacts to the lock/unlock relay. The corresponding relay becomes

energized and the contacts close providing voltage to the door lock

motors. The other relay is normally grounded and provides a path to

ground for the motors. With power and ground provided, the motors will

operate.

Figure 19-13,

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Student Workboo

The system operates in a similar manner using the transmitter. The BCM

provides the same control of the lock/unlock relay.

The following descriptions refer to operation using the key fob remote

keyless entry transmitter.

Unlock Driver's Door Only

Momentarily press the unlock button in order to perform the following

functions:

Unlock the driver's door only.

Illuminate the interior lamps for approximately 20 seconds or until the

ignition is turned ON.

Flash the daytime running lights (if selected ON in personalization).

Chirp the horn (if selected ON in personalization).

Disarm the content theft deterrent system (CTD).

Identify the driver to the radio. The radio will then revert to the station

presets, the last station, the last volume settings, and the last playback

mode used by that driver.

Figure 19-14,

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Student WorkbooUnlock All Doors

Momentarily press the unlock button a second time (within 5 seconds of the

first press) in order to perform the following functions:

Unlock the remaining doors.

Illuminate the interior lamps for approximately 20 seconds or until the

ignition is turned ON.

Lock All Doors

Press the lock button in order to perform the following functions:

Lock all of the doors.

Immediately turn off the interior lamps.

Flash the daytime running lights (if selected ON in personalization).

Chirp the horn (if selected ON in personalization).

Enable the content theft deterrent system (CTD) to arm after all of the

doors are closed.

Rear Compartment Lid Release

If the vehicle transaxle is not in motion, a single press of the trunk release

button will open the trunk lid. The interior lamps will not illuminate.

Alarm

A single press of the alarm button performs the following functions:

Flashes the interior lamps.

Pulses the horn.

Flashes the daytime running lights for 2 minutes or until the following

conditions occur:

The Alarm button is pressed again.

The vehicle is started (the BCM receives a valid Passlock signal

from the ignition lock cylinder).

Rolling Code

The keyless entry system uses a rolling code technology. Rolling code

technology prevents anyone from recording the message sent from the

transmitter and using the message in order to gain entry to the vehicle. The

term "rolling code" refers to the way that the keyless entry system sends

and receives the signals. The transmitter sends the signal in a different

order each time. The transmitter and the body control module (BCM) are

synchronized to the appropriate order. If a programmed transmitter sends a

signal that is not in the order that the BCM expects, the system will not

function.

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Student WorkbooLesson 5. Module Controlled Power Windows

The power window circuit contains the following main components:

Left and right front power window switches

Left and right rear power window switches

Left and right front window motors

Left and right rear window motors

Driver door module (DDM)

Passenger door module (PDM)

Rear door module (RDM)

Each power window is connected to a permanent magnet motor. The

motor raises or lowers the glass when the door module applies voltage to

the motor. The direction the motor turns depends on the polarity of the

supply voltage provided by the associated door module. The two front

doors have their own separate modules. The rear seat contains a singlemodule, which controls both rear power windows.

Figure 19-15,

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Student WorkbooA serial digital communications link, called the simple bus interface (SBI),

is used for communications between door modules and the driver's door

power window switches. The use of serial digital communications allows

the use of a single wire to convey switching information between the

power door lock switch and the driver's door module (DDM). The serial

communication is also used to transmit switching information from the

DDM to the other two door modules.

The door modules apply battery voltage of the correct polarity to the

respective window motor when any local, or power door lock switch, UP

switch is operated, driving the window up. Battery voltage is applied to the

respective window motor in the opposite polarity when any local, or power

window switch, DOWN switch is operated, driving the window down.

Driver Door Module (DDM)

The drivers door module (DDM) directly controls the driver's door windowmotor and the express down window feature. The DDM sends window UP/

DOWN messages received from the power door lock switch to the

passenger door module (PDM) and the rear door module (RDM) over the

simple bus interface (SBI) line. The DDM also contains a class 2 data link

which communicates with other vehicle system modules. The left front

power door locks and outside power mirrors are also controlled through

the DDM.

Figure 19-16,

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Student WorkbooPassenger Door Module (PDM)

The passenger door module (PDM) controls the passenger's door window

motor. The PDM controls the passenger's door window directly from the

RH front power window switch or from instructions over the SBI. The right

front power door locks and outside power mirrors are also controlled

through this module.

Rear Door Module (RDM)

The rear door module (RDM) controls both rear door window motors. The

RDM controls the rear windows directly form the rear door window

switches or from instructions over the SBI.

LH Front Power Window SwitchThe LH front power window switch provides switches for controlling all of

the power windows. This switch also has a lockout button, which the driver

can use to prevent the other window switches from functioning. The switch

passes switching information to the driver's door module (DDM) by way of

the simple bus interface (SBI). Battery voltage and ground are applied to

the LH front power window switch from the DDM through circuits 1729 and

226 respectively.

Figure 19-17,

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Student WorkbooSimple Bus Interface (SBI) Serial Data Link

The simple bus interface (SBI) is a serial data link. This serial data link

replaces vehicle cables between various door modules with a single wire.

The same amount of information is sent by multiplexing (timesharing) data

to and from each device over that wire. The serial data signals are

referenced to ground. If the SBI is lost, both the rear door module (RDM)

and the passenger door module (PDM) will enter the sleep mode. With the

RDM and PDM in sleep mode, no power window operations are possible.

Express Window Down Operation

The express down window function is a driver's window only standard

feature that allows the left front window to be fully opened by momentarily

pressing the left front window DOWN switch to the second detente.

Express down travel may be stopped at any position by momentarily

pressing either the UP or DOWN switch.

Window Switch Operation

When any driver's door power window switch is pressed, a simple bus

interface (SBI) serial digital message is transmitted from the LH front

power window switch to the driver's door module (DDM).

If the either the passenger or the rear window switch is pressed, an SBI

message, relating the switch operation, is transmitted from the DDM to

either the passenger's door module (PDM) or the rear door module (RDM)

as appropriate. All of the window motors are directly controlled by their

respective door modules.

If the driver's window switch is pressed, the DDM will apply battery voltage

of the correct polarity directly to the LH front power window motor, driving

the window up or down.

Each window motor is protected by an electronic circuit breaker. If a

window switch is held too long with the window obstructed or after the

window is fully up or down, the circuit breaker opens the circuit. The circuit

breakers have positive temperature coefficients (PTC) and reset

automatically when voltage is removed from the motors.

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Student WorkbooLesson 6. Module Controlled PowerLocks

The power door lock subsystem contains the following main components:

Class 2 serial data link

Door lock actuators (motors/manual levers)

Power door lock switch

Driver door module (DDM)

Left front power door lock switch

Passenger door module (PDM)

Rear door module (RDM)

Remote function actuator (RFA) module

Right front power door lock switch

Simple bus interface (SBI)

Figure 19-18,

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Student WorkbooRemote Function Actuator (RFA) Module

The remote function actuator (RFA) module is the door lock master

device. This means the RFA has final control over whether or not all doors

will lock or unlock under power. The RFA will not allow any doors to be

power locked unless the key is out of the ignition and the doors are all

closed as indicated by the door jamb switches.

Drivers Door Module (DDM)

The driver's door module (DDM) directly controls the driver's door lock

actuator motor. The DDM receives and forwards driver's door switch lock

request messages to the remote function actuator (RFA) via the serial

data link. The RFA receives the request message and examines it for

lockout prevention criteria. If the conditions are proper, the RFA sends a

lock or unlock command message back to the DDM. The DDM forwards

door lock messages received from the remote function actuator (RFA) to

the passenger door module (PDM) and the rear door module (RDM) over

a simple bus interface (SBI) line. The DDM also contains a class 2 serialinterface which communicates with other vehicle system modules. The LH

front door power window and the outside power mirror are also controlled

through the DDM. Battery voltage is always applied to the DDM through

the RAP circuit breaker located in the Underhood Maxifuse Block.

Figure 19-19,

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Student WorkbooPassenger Door Module (PDM)

The passenger's door module (PDM) controls the passenger's door lock

actuator. The PDM also monitors the passenger's power door lock switch.

The RH front door power window and outside power mirror are also

controlled through the PDM.

Rear Door Module (RDM)

The rear door module (RDM) controls both rear door lock actuators. The

RFA commands the DDM to lock or unlock the doors via a class 2 serial

data message. The DDM then forwards this command to the RDM in the

form of a simple bus interface (SBI) serial data message.

Figure 19-20,

Figure 19-21,

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Student WorkbooPower Door Lock Switch

The power door lock switch is a multiplexed device that communicates

with the drivers door module (DDM) via the simple bus interface (SBI)

serial data link. The LH power door lock switch feeds the LH front power

window switch which then transmits a switch activity message to the DDM.

Passenger Power Door Lock Switch

The RH front power door lock switch directly switches the passenger doormodule (PDM) input. The PDM then transmits a switch activity message to

the DDM over the simple bus interface (SBI).

Door Lock Actuators

The power door lock actuators receive their power from the door modules.

The door modules apply battery voltage of the correct polarity to their

respective door lock motors when any door lock switch is operated, driving

the door lock lever in or out. The rear doors have no power lock buttons,

only manual lock levers. The power door lock switches are generally

closed for just a moment. If the power door lock switches are held closed

for too long, an electronic circuit breaker in each actuator will open to

protect the motor against damage. The circuit breakers have positive

temperature coefficients (PTC) and will reset automatically when voltageis removed from the actuator. When either the left or right front power door

lock switch is activated, all of the doors are locked or unlocked in unison.

Each door lock actuator assembly contains a manual door lock lever. The

lock levers move with actuator position and may be used to independently

lock or unlock any individual door at any time. Both front doors have key

cylinders that will unlock the doors and move the lock actuators. When the

drivers door key cylinder is turned, all doors will unlock. The key locks and

manual lock levers will still work if electrical power is lost.

Figure 19-22,

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Student WorkbooClass 2 and Simple Bus Interface (SBI) Serial Data Links

The class 2 and simple bus interface (SBI) are both serial data links. The

serial data links replace cables in the vehicle by multiplexing (timesharing)

data to and from each device over a single wire referenced to ground. If

the SBI is lost, both the rear door module (RDM) and the passenger door

module (PDM) enters the sleep mode. With the RDM and the PDM in

sleep mode, no power door lock operations are possible.

Lock/Unlock Sequence

When the passenger power door lock switch is pressed, the following

events occur:

1. The passenger door module (PDM) will directly sense actuation of the

passenger door power lock switch.

2. The PDM will send a serial data link message to the driver's door

module (DDM) requesting that the doors be locked.

3. The DDM receives and forwards the lock request message to theremote function actuator (RFA) via a serial data link.

4. The RFA receives the request message and examines for the following

lockout prevention criteria:

IGNITION SWITCH KEY PRESENT signal (CKT 80) from the

ignition switch

DRIVER DOOR OPEN message from the DDM

Last door closed locking (LDCL) function active message from the

IPC

5. The RFA broadcasts a serial data link command message to lock all of

the doors when:

The ignition key is out of the ignition switch and If last door closed

locking (LDCL) is inactive, as soon as the driver's door is closed. If

LDCL is active, as soon as all doors are closed for 5 seconds.

The driver's power door lock switch is held in the LOCK position for

greater than 3 seconds (Lockout Override).

6. The DDM receives and transmits the command message from the RFA

to the PDM and rear door module (RDM).

7. All three modules actuate their door lock motors, thus completing the

locking sequence.

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Student WorkbooLast Door Closed Locking (LDCL) Feature

The LDCL feature provides a wait state following a lock switch or keyless

entry transmitter LOCK command. When a lock command is received, the

key must be out of the ignition switch, and all doorjamb switches must

indicate closed, before any doors are locked. Once all doors close, a 5

second delay is provided for re-entry prior to locking the doors.

The LDCL feature may be activated by the customer through pressing thepower door lock switch and then pressing a valid keyless entry transmitter

UNLOCK button. Repeating this sequence will toggle the LDCL off and on.

LDCL mode active is the standard setting for both keyless entry

transmitters as delivered to the dealer.

Automatic Door Locks

The automatic door lock (ADL) function provides for locking or unlocking

the doors when shifting the transmission in and out of PARK. Customized

selections may be made as follows:

1. No automatic door lock or unlock

2. Automatic all door lock when shifter moves out of PARK. No automatic

door unlock

3. Automatic all door lock when shifter moves out of PARK. Automatic

driver door unlock when shifter moves into PARK

4. Automatic all door lock when shifter moves out of PARK. Automatic all

door unlock when shifter moves into PARK.

The driver's door module (DDM) communicates with the remote function

actuator (RFA) module over the class 2 data link. The RFA modulereceives powertrain control module (PCM) shift select changes. Whenever

the left front door is closed, the ignition is in RUN and the gear selector is

shifted out of PARK, the RFA module will transmit a class 2 lock doors

message to the DDM. The DDM will send this message on to the other

door modules over the simple bus interface (SBI) and the modules will

lock their doors as programmed. If personalization is selected to do so,

the RFA will also unlock the doors when the gear selector lever is put back

in to PARK. Refer to Keyless Entry System Operation in Keyless Entry.

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Student WorkbooLabsheet 1

Cruise Control

Lab Objectives:

apply principles of stepper motors and controls





operate J 42958 Cruise Control Tester

1. Locate a vehicle the uses stepper motor cruise control.

2. Indicate vehicle make, model, year. ________________________

3. Make the following voltage checks at the cruise control module

connector with the connector unplugged:

Cruise on input with the switch open _____ closed _____

Set switch input with the switch open _____ closed _____

4. Res/Acc switch input with the switch open _____ closed _____

5. How many brake and clutch switch inputs are there to this cruise

control module? _____

6. Check for voltage at the module connector for each of these inputs

with the switch open and closed.

Results ______________________

7. With the module connector disconnected, connect the red voltmeterlead to B+ and the black lead to the vehicle speed sensor input

terminal. Raise and support the drive wheels. With the key on and the

transmission in drive rotate by hand one drive wheel and measure the

minimum and maximum DC voltage at this input.

It may be necessary to use the meter min/max feature.

Results __________

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Student Workboo8. Perform the Cruise Control Diagnostic Circuit Check. List any steps

that did not pass.

________________________________________________________

________________________________________________________

9. List any recommended repairs. _____________________________________________________________________________________

10.Remove the cruise control switch from the column. Use an ohmmeter

to make continuity checks of the on-off, set/coast, and resume/accel

switches in each position.

Results ________________________________________________

_______________________________________________________

11. Install switch in column.

12.Locate a J 42958 Cruise Control Tester and demonstrate the above

findings to the instructor. Demonstrate to instructor the procedure for

adjusting the cruise control cable and the procedure for adjusting the

brake and clutch switches.

13.List 3 conditions when the PCM will not allow the cruise control to be

enabled.

1. ____________________________________________________

2. ____________________________________________________

3. ____________________________________________________

14. Perform the Cruise Control Diagnostic System Check and list any

items that did not pass.

15. Review this worksheet with instructor before leaving the vehicle.

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Defogger

Lab Objectives:

apply principles of series and parallel circuits

use service information to locate components



1. Locate a vehicle with a rear window defog circuit.

2. Indicate vehicle make, model, year. _________________________

3. List all of the components used in the defog circuit.______________________________________________________

______________________________________________________

4. What component controls the defog relay?____________________

______________________________________________________

5. Is the relay coil controlled on the B+ or ground side?

______________________________________________________

______________________________________________________

6. What component provides the input to the relay controller?

______________________________________________________

______________________________________________________

7. Backprobe the defog relay high current load side of the switch with avoltmeter. Command the relay on and measure available voltage at

this point. ______________________________________________

______________________________________________________

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Student Workboo8. What should the voltage drop be of each of the conductive lines in

the window grid? _______________________________________

_____________________________________________________

9. Use a voltmeter to measure these voltage drops and record them

here._________________________________________________

_____________________________________________________

10.Perform the Diagnostic Circuit Check on this system and list any

steps that did not pass below. _____________________________

_____________________________________________________

11. List any recommended repairs. ____________________________

_____________________________________________________

_____________________________________________________

12.Review this worksheet with instructor before leaving the vehicle.

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Power Windows and Locks (without Door Modules)

Lab Objectives:






1. Locate a vehicle with non-door module power windows and locks.

2. Indicate vehicle make, model, year. _________________________

______________________________________________________

3. Remove one power window motor with the regulator and necessary

switches to operate the motor. Caution: if regulator is equipped with

a wind-up spring contact instructor before removing.

4. Using jumper wires (fused B+) rewire this system on the workbench to

make the motor travel up and down.

5. Measure and record the amount of current required to operate the

motor. ______________ Demonstrate this to instructor.

6. Remove power door lock motor and necessary switches and relays to

operate this door.

7. Using jumper wires (fused B+) rewire this system on the workbench to

make the motor travel to the lock and unlock positions. Demonstrate

operation to instructor.

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Student Workboo8. Reassemble components on vehicle and verify operation before

installing door panel. Make any necessary glass adjustments at this

time.

9. Perform the Diagnostic System Check for this system and list any

items that did not pass. __________________________________

_____________________________________________________

10.If this vehicle is equipped with Remote Keyless Entry, list the

procedure used to program a transmitter. ____________________

_____________________________________________________

_____________________________________________________

11. List any recommended repairs. ____________________________

_____________________________________________________

_____________________________________________________

12.After final assembly, have instructor inspect vehicle.

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Power Windows and Locks (Module Equipped Doors)

Lab Objectives:






operate Tech 2 to display data

1. Locate a vehicle with power windows and locks that uses electronic

door modules.

2. Indicate vehicle make, model, year. __________________________

_______________________________________________________

3. List all modules by name used for power window and lock operation.

_______________________________________________________

_______________________________________________________

_______________________________________________________

4. Use a Tech 2 to check for module communication.

5. Select a door. Monitor switch input data for this door. Record what

the data display is when using the door switch to run the glass down.

_______________________________________________________

Data display when switched to up. ___________________________

Data display when switched to lock. __________________________

Data display when switched to unlock. ________________________

6. Are the switches operating correctly? _________________________

_______________________________________________________

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Student Workboo7. Remove the inner door panel to gain access to the window motor

connector and door lock motor connector.

8. With the window switch in the up position, list the wire by circuit

number at the motor that is providing B+ to the motor. ______ Unplug

the connector at the motor and record the voltage in the up position on

this wire.

9. With the door lock switch in the unlock position, list the wire by circuit

number at the motor that is providing ground to the motor. _______

Unplug the connector at the motor and using a powered up test light

probe this wire. Is the light on? ________ Power up a voltmeter and

repeat this step. Record voltage.

10.Perform the Diagnostic System Check for this system and list any

steps that did not pass._______________________________________________________

_______________________________________________________

_______________________________________________________

11. List any recommended repairs.

_______________________________________________________

_______________________________________________________

12.Reassemble door and verify operation.

13.If this vehicle is equipped with Remote Keyless Entry, list the

procedure for reprogramming a transmitter.

_______________________________________________________

_______________________________________________________

_______________________________________________________

14.Review this worksheet with instructor before leaving vehicle.

SWB a6 m19 Final

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