Cruise Control System Chevrolet Camaro IV

DESCRIPTION & OPERATION

Cruise control system uses a control module to obtain desired vehicle cruise operation. An electronic controller and an electric stepper motor are 2 important components in the cruise control module. Controller monitors vehicle speed and operates electric stepper motor. Stepper motor moves throttle linkage.

Cruise control module contains a low speed limit to prevent cruise engagement below a minimum speed of 25 MPH. System capabilities include cruise, coast, resume speed, accelerate, "tap-up" and "tap-down". Control switches located on multifunction turn signal lever operate controller. Electric brake switches mounted on brake pedal bracket disengage cruise system when brake pedal is depressed.

ENGAGEMENT SWITCH

The engagement switch turns cruise control system on and off. With switch pushed to ON position and SET button pushed in, cruise speed should be maintained. With cruise in RESUME/ACCELERATE (R/A) position, cruise speed can be resumed after slowing down or stopping.

With cruise in R/A position, cruise speed can be raised (tap-up) or lowered (tap-down) in one MPH increments. Cruise control engagement switch is located in multifunction lever, which serves as turn signal lever and wiper switch.

CRUISE CONTROL MODULE

Cruise control module is mounted on left side of engine compartment near master cylinder. Cruise control module uses an internal electronic controller and electric stepper motor to vary throttle with each cruise control mode.

BRAKE & CLUTCH RELEASE SWITCHES

On automatic transmission models, a brakelight/Torque Converter Clutch (TCC) switch and a cruise control release switch mounted on brake pedal bracket are used to disengage cruise system electrically when brake pedal is depressed. Manual transmission models also use a clutch start switch and cruise control clutch anticipate switch (3.4L) or cruise control clutch release switch (5.7L) to stop cruise operation. (Scheme 1) Speed of vehicle at brake actuation will be stored in cruise control module memory.

Scheme 1

VEHICLE SPEED SENSOR (VSS)

A Permanent Magnet (PM) generator, driven by transmission, generates an output frequency of vehicle speed information. This frequency is sent to ECM, where signal is amplified and sent to cruise control module for cruise control operation.

Depress brake pedal and insert brakelight/TCC and cruise control release switches into proper switch receptacles until fully seated. Slowly pull brake pedal back to its fully retracted position (requires 50 lbs. of force). TCC/cruise control and brakelight switch will move within switch retainers to proper adjustment.

CRUISE CONTROL CABLE

Information is not available from manufacturer.

CRUISE CONTROL WILL NOT ENGAGE, SPEEDOMETER INOPERATIVE

Check vehicle speed sensor. See VEHICLE SPEED SENSOR (VSS) under DIAGNOSIS & TESTING. Check for ECM trouble Code 24. See the TESTS W/CODES article in the ENGINE PERFORMANCE section.

TESTS W/CODES - 3.4L

SYSTEM/COMPONENT TESTS - 5.7L

CRUISE CONTROL WILL NOT ENGAGE, SPEEDOMETER OPERATES NORMALLY

1. Turn ignition off. Disconnect cruise control module connector. Turn ignition switch to RUN. Using a test light, check for battery voltage at terminal "F" of cruise control module harness connector. (Scheme 2) If battery voltage is present at terminal "F", go to next step. If battery voltage is not present at terminal "F", check fuses and check wire to terminal "F" for open or poor connection. See WIRING DIAGRAM.
2. Using a DVOM or test light, check module ground at terminal "E". If module ground is okay, go to next step. If module ground is not okay, service Black or Black/White wire from chassis ground to cruise control module.
3. Ensure ignition switch is still in RUN position. Set cruise control slider switch to ON position. Using a test light, check for battery voltage at terminals "B" and "C" of cruise control module connector. If battery voltage is not present at either terminal "B" or "C", go to next step. If voltage is present at terminal "B", check Dark Blue wire for short to battery voltage. If voltage is present at terminal "C", check Gray/Black wire for short to battery voltage.
4. Using a test light, check for battery voltage at terminal "A" of cruise control module connector. If battery voltage is present, go to step 6). If battery voltage is not present at terminal "A", check for battery voltage to cruise switch. (Check at connector at base of steering column). Battery voltage should be present at Pink wire. If battery voltage is present, go to next step. If battery voltage is not present, check for open in Pink wire between fuse panel and cruise control switch.
5. Check for open in Gray wire between cruise control switch and cruise control module. Repair Gray wire if necessary. If Gray wire is okay, replace cruise control switch/multifunction lever assembly.
6. Check for battery voltage at terminal "D" of cruise control module connector. If battery voltage is present, go to next step. If battery voltage is not present, backprobe Pink wire at clutch pedal switch (M/T) or brake pedal switch (A/T). If battery voltage is not present, service Pink wire as necessary. If voltage is present, check clutch or brake pedal switch operation, replace as necessary.
7. Check brakelight operation. If okay, go to next step. If brakelights do not operate properly, backprobe Orange wire of brakelight switch connector. If voltage is not present, service Orange wire to STOP/HAZARD fuse in instrument panel fuse panel. If voltage is present at Orange wire of brakelight switch connector, backprobe Yellow wire of brakelight switch connector and press brake pedal. If battery voltage is not present, replace brakelight switch. If battery voltage is present, unplug brakelight switch connector. Using a DVOM, check for open in yellow wire between brakelight switch and cruise control module.
8. Connect a test light to terminal "B" of cruise control module connector. Press and hold SET switch. If test light glows, go to step 10). If test light does not glow, use a test light and backprobe cruise control switch terminal "K" (Dark Blue wire) to ground. Press and hold SET switch.
9. If test light lights, check for poor connection at cruise control switch terminal "K" (Dark Blue wire). If wire is okay, repair open circuit in Dark Blue wire between cruise control switch terminal "K" and cruise control module terminal "B". If test light does not light, check for open circuit at cruise control switch terminal "K" (Dark Blue wire). If switch terminal is okay, check for open circuit in Dark Blue wire inside steering column. If wiring is okay, replace cruise control switch.
10. Connect Instrument Panel Tester (J 33431) to vehicle speed sensor connector. Set tester to 60 Hz scale. Measure frequency of signal at cruise control module connector terminal "K" (Green/White wire). If frequency is not 60 Hz, go to step 12). If frequency is 60 Hz, go to next step.
11. Check for poor connection at cruise control module. Check for proper operation of mechanical link cable. If connection and cable are okay, replace cruise control module. Ensure cable strap is not twisted during installation.
12. If frequency is not 60 Hz, check if speedometer is at about 54 mph. If speedometer is not at about 54 mph, check if instrument panel tester is correctly installed. If tester is correctly installed, check vehicle speed sensor. See VEHICLE SPEED SENSOR (VSS) under DIAGNOSIS & TESTING.
13. If speedometer is at about 54 mph, check for poor connection at 17-pin connector terminal A1 (Dark Green/White wire) located behind left kick panel. If connection is okay, repair open circuit in Dark Green/White wire between cruise control module terminal "K" and splice.

CRUISE CONTROL WILL NOT RESUME, ACCELERATE, TAP-UP OR

TAP-DOWN

1. Turn ignition switch to RUN position. Set cruise control switch to ON position. Backprobe Gray/Black wire of cruise control switch. If test light does not glow, replace cruise control switch/multifunction lever. If test light glows, go to next step.
2. Check Gray/Black wire for open, repair wire as necessary. If Gray/Black wire is okay, check associated connectors for good connection. If okay, replace cruise control module.

1. Disconnect ECM connector containing Dark Green/White wire. Connect Red wire of Signal Generator Instrument Panel Tester (J-33431-B) to Dark Green/White wire. Connect Black wire of tester to a good ground. Set tester to 54 MPH. Turn ignition switch to RUN position.
2. If speedometer reads 54 MPH, check for poor connection at Dark Green/White wire of ECM connector. If okay, replace ECM. If speedometer does not read 54 MPH, check for open or short in Dark Green/White wire between ECM and Cruise control module and instrument cluster. Check for poor connection at instrument panel connector. If okay, service instrument cluster.

TROUBLE SHOOTING

1. To resolve any cruise control system malfunction, perform a visual inspection of all components. Check system to ensure there are no blown fuses, damaged or disconnected electrical wires or poor connections. Check high mounted brakelight bulbs; if burned out, cruise control system will not function.
2. With ignition switch in RUN position, battery voltage is applied to terminal "F" of cruise control module. (Scheme 2) When cruise control switch slider is moved to ON position, battery voltage is applied to terminal "A" of module connector.
3. When brake pedal is released, battery voltage should be present at module terminal "D". When brake pedal is depressed, battery voltage should be present at module terminal "G". When cruise switch slider is moved to R/A position, battery voltage should be present at terminal "C" of module connector.
4. With SET button depressed, battery voltage should be present at module terminal "B". With vehicle moving faster than 25 MPH, voltage at module terminal "K" will oscillate from 0-5 volts. Module ground is at terminal "E".

Scheme 2

REMOVAL & INSTALLATION

1. Disconnect negative battery cable. Raise vehicle. Disconnect speed sensor electrical connector. Remove speed sensor retainer bolt, retainer and spacer. Remove speed sensor. Remove speed sensor "O" ring and gear from speed sensor.
2. To install, reverse removal procedure. Tighten speed sensor retainer bolt to 89 INCH lbs. (10.1 N.m).

Removal

1. Remove air cleaner and resonator. Disconnect cruise control cable and clip from throttle body lever stud. Unlock cable conduit at accelerator cable bracket. Remove cable and conduit from accelerator cable bracket.
2. Remove cable from cruise control module. Compress conduit tangs and pull conduit out of cruise control stepper motor ribbon end fitting on module housing. Disconnect cable bead from cruise control motor ribbon end fitting on module. Note routing of cable from vehicle.

Installation

To install, reverse removal procedure. Adjust cruise control cable (if necessary).

1. Disconnect negative battery cable. Remove electrical connectors from switches. Remove switches from retainer. Remove retainer from brake pedal mounting bracket.
2. To install, reverse removal procedure. Adjust brake release switch. See BRAKE & CLUTCH RELEASE SWITCHES under ADJUSTMENTS.

1. Disconnect negative battery cable. Disconnect cruise control module electrical connector. Disconnect cruise control cable from module. Remove cruise control module mounting screws. Remove cruise control module and grommet nuts. Remove grommet nuts from cruise control module if new module is used.
2. To install, reverse removal procedure. Tighten cruise control module mounting screws to 18 ft. lbs. (24 N.m).

CRUISE CONTROL SWITCH

Note. Cruise control switch is serviced by replacing entire multifunction lever.

Disconnect negative battery cable. Remove steering column housing cover end cap by pulling toward front of vehicle. Disconnect electrical connector. Ensure all switches and controls are in OFF position. Pull multifunction lever straight out (toward driver door). Remove multifunction lever. To install, reverse removal procedure.

See also:
• AIR BAG RESTRAINT SYSTEM
• TESTS W/CODES - 3.4L
• SYSTEM/COMPONENT TESTS - 5.7L
• COMPUTER RELEARN PROCEDURES