1997 Chevrolet K1500 Service & Repair Manual
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1996 ACCESSORIES & EQUIPMENT
Cruise Control System
DESCRIPTION & OPERATION
Description
Cruise control system components include: Powertrain Control Module (PCM) or Vehicle Control
Module (VCM), cruise control module (electronic controller and electric stepper motor combined),
cruise control switch, vehicle speed sensor, vehicle speed sensor buffer, and brake and clutch release
switches.
CRUISE CONTROL MODULE
Cruise control module is mounted on upper radiator support, next to master cylinder. See Fig. 1 .
Module incorporates an electronic controller and an electric stepper motor. Stepper motor regulates
throttle position in response to control module commands. Module is not serviceable.
Fig. 1: Electric Motor Cruise Control Module ("C" & "K" Series Pickup, Sierra, Suburban,
Tahoe & Yukon)
Courtesy of GENERAL MOTORS CORP.
CRUISE CONTROL SWITCH
Cruise control switch, mounted on end of multifunction (turn signal) lever, controls system
operational modes.
SET/COAST
To set vehicle speed, turn control switch to ON position. With vehicle speed at 25 MPH or more,
press and release SET/COAST button. Vehicle will maintain set speed.
To increase speed during engaged cruise, accelerate to desired speed. Press and release SET/COAST
button. Vehicle will maintain new set speed.
To decrease speed during engaged cruise, press and hold SET/COAST button. System will
disengage. When vehicle has slowed to desired speed, release SET/COAST button. Vehicle will
maintain new set speed.
To decrease speed by one-MPH increments during engaged cruise, tap SET/COAST button (quickly
press and release button; DO NOT hold button). Vehicle speed will decrease one MPH for each tap
of the button.
RESUME/ACCEL
To resume set speed after system has been disengaged by braking, momentarily engage and release
RESUME/ACCEL switch. Vehicle will return to se speed. If RESUME/ACCEL switch is engaged
for more than one second, vehicle will begin to accelerate. To accelerate using cruise control system,
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engage and hold RESUME/ACCEL switch until desired speed is reached.
To increase speed by one-MPH increments during engaged cruise, tap RESUME/ACCEL switch
(quickly move to RESUME/ACCEL position and release). Vehicle speed will increase one MPH for
each tap of the switch. After 10 taps, system must be reset to a new speed to continue this function.
BRAKE & CLUTCH RELEASE SWITCHES
Brake and clutch release switches allow current flow to module when brakes and clutch are released.
When brake or clutch pedal is depressed, voltage supply to cruise control circuit in PCM/VCM is
interrupted. Brake switch may incorporate brakelight and torque converter clutch switch.
VEHICLE SPEED SENSOR
Vehicle Speed Sensor (VSS) is mounted in transmission (2WD) or transfer case (4WD). VSS
produces an AC signal with a frequency proportional to the speed at which the transmission output
shaft rotates, which is also proportional to vehicle speed. This signal is then sent to vehicle speed
sensor buffer.
VEHICLE SPEED SENSOR BUFFER
Vehicle speed sensor buffer receives and conditions AC voltage to a rate of 4000 pulses per mile.
This signal is then sent to cruise control module, speedometer, and VCM/PCM. These components
convert the number of pulses per mile to pulses per second to determine the speed of the vehicle.
Buffer is located above accelerator pedal, on left side of instrument panel, near parking brake.
TROUBLE SHOOTING
1. Check fuses, and replace as necessary. Ensure cruise control cable and throttle linkage move
freely. Some problems may be related to vehicle speed sensor circuit. Check for codes. See
TESTS W/CODES - GASOLINE article.
2. Check for a broken or partially broken wire inside insulation which could cause system
malfunction but prove good in a continuity/voltage check with system disconnected. Visually
inspect for broken or open wires. Ensure any aftermarket electronic equipment is properly
installed.
TESTING
CRUISE CONTROL DOES NOT ENGAGE
1. Ensure BRAKE (10-amp), STOP/HAZ (20-amp) and CRUISE (10-amp) fuses are okay. Turn
ignition switch to RUN position. Turn cruise control off. Disconnect cruise control module.
Connect test light between 48-pin C266 connector (located under left side of steering column,
near firewall) terminal A13 (Brown wire) and ground. If test light glows, go to next step. If test
light does not glow, repair open in Brown wire between C266 connector and fuse block.
NOTE: In the following tests, use an unpowered test light unless otherwise
indicated.
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2. Connect test light between cruise control module connector terminal "A" (Gray wire) and
ground. If test light does not glow, go to next step. If test light glows, check for short to power
in Gray wire. If circuit is okay, replace cruise control switch.
3. Connect test light between cruise control module connector terminal "C" (Gray/Black wire)
and ground. If test light does not glow, go to next step. If test light glows, check for short to
power in Gray/Black wire. If circuit is okay, replace cruise control switch.
4. Connect test light between cruise control module connector terminal "B" (Dark Blue wire) and
ground. If test light does not glow, go to next step. If test light glows, check for short to power
in Dark Blue wire. If circuit is okay, replace cruise control switch.
5. Turn cruise control on. Connect test light between C266 connector terminal A12 (Gray wire)
and ground. If test light glows, go to next step. If test light does not glow, replace cruise
control switch.
6. Connect test light between cruise control module connector terminal "A" (Gray wire) and
ground. If test light glows, go to next step. If test light does not glow, repair open in Gray wire.
7. Connect test light between cruise control module connector terminal "F" (Brown wire) and
ground. If test light glows, go to next step. If test light does not glow, repair open in Brown
wire.
8. Connect self-powered test light between cruise control module connector terminal
"E" (Black/White wire) and ground. If test light glows, go to next step. If test light does not
glow, repair open in Black/White wire.
9. Connect test light between C266 connector terminal A12 (Gray wire) and ground. Press and
hold RESUME/ACCEL switch. If test light glows, go to next step. If test light does not glow,
replace cruise control switch.
10. Connect test light between cruise control module connector terminal "C" (Gray/Black wire)
and ground. Press and hold RESUME/ACCEL switch. If test light glows, go to next step. If
test light does not glow, repair open in Gray/Black wire.
11. Connect test light between cruise control module connector terminal "B" (Dark Blue wire) and
ground. Press and hold SET/COAST switch. If test light glows, go to step 13). If test light does
not glow, go to next step.
12. Connect test light between C266 connector terminal A14 (Dark Blue wire) and ground. Press
and hold SET/COAST switch. If test light glows, repair open in Dark Blue wire. If test light
does not glow, replace cruise control switch.
13. Ensure brake pedal is not pressed. Connect test light between cruise control module connector
terminal "G" (White wire) and ground. If test light glows, go to next step. If test light does not
glow, go to step 15).
14. Leaving test light connected, disconnect brakelight switch. If test light glows, repair short to
power in White wire. If test light does not glow, replace brakelight switch.
15. Leaving test light connected, depress brake pedal. If test light glows, go to next step. If test
light does not glow, repair open in White wire.
16. Connect test light between cruise control module connector terminal "D" (Purple wire on A/T
models, Brown/White wire on M/T models) and ground. If test light glows, go to next step. If
test light does not glow, go to step 18).
17. Leaving test light connected, depress brake pedal. If test light does not glow, go to step 20)
(M/T) or 23) (A/T). If test light glows, check for short to power in Purple or Brown/White
wire. If circuit is okay, replace brakelight switch.
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18. Connect test light between brakelight switch connector terminal "E" (Purple wire) and ground.
If test light does not glow, go to next step. If test light glows on M/T models, go to step 21). If
test light glows on A/T models, repair open in Purple wire.
19. Connect test light between brakelight switch connector terminal "F" (Brown wire) and ground.
If test light glows, replace brakelight switch. If test light does not glow, repair open in Brown
wire.
20. Release brake pedal. Leaving test light connected, press clutch pedal. If test light glows,
replace clutch pedal switch. If test light does not glow, go to step 23).
21. Connect test light between clutch pedal switch terminal "B" (Purple wire) and ground. If test
light glows, go to next step. If test light does not glow, repair open in Purple wire.
22. Connect test light between clutch pedal switch terminal "D" (Brown/White wire) and ground.
If test light glows, repair open in Brown/White wire. If test light does not glow, replace clutch
pedal switch.
23. Turn ignition off. Disconnect VCM. Connect self-powered test light between cruise control
module connector terminal "K" (Dark Green/White wire) and ground. If test light does not
glow, go to next step. If test light glows, repair short to ground in Dark Green/White wire.
24. Connect self-powered test light between cruise control module connector terminal "K" (Dark
Green/White wire) and VCM Black 24-pin connector C4, terminal No. 3 (Dark Green/White
wire). If test light glows, go to next step. If test light does not glow, repair open in Dark
Green/White wire.
25. Reconnect cruise control module. Turn ignition on. Turn cruise control on. Using voltmeter,
check voltage between VCM Black 24-pin connector C4, terminal No. 3 (Dark Green/White
wire) and ground. If reading is greater than 4.5 volts, check for poor connections at VCM. If
connections are okay, replace VCM. If reading is less than 4.5 volts, check for poor
connections at cruise control module. If connections are okay, replace cruise control module.
CRUISE CONTROL WILL NOT RESUME, ACCELERATE OR TAP-UP
1. Disconnect cruise control module. Turn ignition on. Turn cruise control on. Connect test light
between cruise control module connector terminal "C" (Gray/Black wire) and ground. Press
and hold RESUME/ACCEL switch. If test light glows, go to next step. If test light does not
glow, go to step 3).
2. Check for a short to ground in Gray/Black wire. Check for poor connection at cruise control
module connector terminal "C" (Gray/Black wire). If circuit and connections are okay, replace
cruise control module.
3. Check for a poor connection or open in Gray/Black wire. If connection and circuit are okay,
replace multifunction lever. See appropriate STEERING COLUMN SWITCHES article.
REMOVAL & INSTALLATION
CAUTION: When battery is disconnected, vehicle computer and memory
systems may lose memory data. Driveability problems may exist
until computer systems have completed a relearn cycle. See
COMPUTER RELEARN PROCEDURES article in GENERAL
INFORMATION before disconnecting battery.
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BRAKE & CLUTCH RELEASE SWITCHES
Removal & Installation
1. Disconnect negative battery cable. Disable air bag system. See AIR BAG RESTRAINT
SYSTEM article. Using snap ring pliers, remove retainer from pedal pin. Remove switch from
pushrod. Remove electrical connectors from switch.
2. To install, reverse removal procedure. When installing retainer onto pedal pin, use 7/16" socket
to push NEW clip on pin.
CRUISE CONTROL CABLE
Removal & Installation
1. Remove cruise control cable at throttle lever stud and engine bracket. Remove cruise control
cable from cruise control module.
2. To install, reverse removal procedure. Ensure ribbon in cruise control module is not twisted.
On 7.4L, ensure throttle is closed when installing cable to throttle lever stud. Ensure a 0-
0.197" (0-5 mm) clearance exists.
CRUISE CONTROL MODULE
Removal & Installation
Disconnect negative battery cable. Remove cruise control cable. See CRUISE CONTROL
CABLE . Disconnect electrical connector from module assembly. Remove cruise control module. To
install, reverse removal procedure. Tighten cruise control module fasteners to specification. See
TORQUE SPECIFICATIONS .
VEHICLE SPEED SENSOR (VSS)
Removal (A/T Models)
Disconnect negative battery cable. Raise and support vehicle. Disconnect speed sensor electrical
connector. Remove speed sensor retainer bolt. Using Speed Sensor Remover/Installer (J-38417),
remove speed sensor. Remove speed sensor "O" ring from speed sensor.
Installation
To install, reverse removal procedure. Lubricate "O" ring with transmission fluid. Tighten speed
sensor retainer bolt to 97 INCH lbs. (11 N.m).
Removal (M/T Models)
Disconnect negative battery cable. Raise and support vehicle. Disconnect speed sensor electrical
connector. Remove speed sensor retainer bolt. Remove speed sensor. Remove speed sensor "O" ring
from speed sensor.
Installation
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To install, reverse removal procedure. Lubricate "O" ring with transmission fluid. Tighten speed
sensor bolt to 16 ft. lbs.(22 N.m).
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS
WIRING DIAGRAMS
Fig. 2: Cruise Control System Wiring Diagram ("C" & "K" Series Pickup, Sierra, Suburban,
Tahoe & Yukon)
Application Ft. Lbs. (N.m)
Cruise Control Module Screws 44 (5)
Vehicle Speed Sensor Bolt
A/T 97 (11)
M/T
(1)
(1)
Tighten bolt to 16 ft. lbs. (22 N.m).
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What's Included?
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Fast Download Speeds
Offline Viewing
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Full Search Facility
Print one or all pages of your manual
$36.99
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