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Cruise Control System Check

  1. Turn ignition off. Install Tech 1 according to manufacturer's instructions. Turn ignition on. Using Tech 1, observe CRUISE CONTROL (C/C) BRAKE SWITCH input. If Tech 1 brake switch indication is "N" (released), go to step 4). If Tech 1 brake switch indication is "Y" (applied), go to next step.
  2. Disconnect Blue brake switch connector. Using a jumper wire, connect brake switch connector terminals together (Gray and Brown wire terminals). Observe C/C BRAKE SWITCH on Tech 1. If brake switch indication is "Y" (applied), go to next step. If brake switch indication is "N" (released), adjust or replace brake switch as necessary. See BRAKE RELEASE SWITCH under ADJUSTMENTS.
  3. Check for open in Pink/White wire between fuse block and multifunction lever connector terminal E1. See Fig 1. Check for open in Brown wire between brake switch and PCM Black 32-pin connector terminal D10. See Fig 2. Check for open in Gray wire between brake switch and Green 32-pin PCM connector terminal E2. Repair as necessary.
    NOTE: Multifunction lever connector is located behind left side of instrument panel below steering column.
    Fig 1: Identifying Multifunction Lever Connector Terminals
    G92B03693Courtesy of GENERAL MOTORS CORP.
    Fig 2: PCM Connector Terminal Identification
    G92A03697Courtesy of GENERAL MOTORS CORP.
  4. Place cruise control main switch in ON position. Using Tech 1, observe C/C ON/OFF switch input. If Tech 1 indicates input is on, go to step 7). If Tech 1 indicates input is off, go to next step.
  5. Disconnect PCM Green 32-pin connector. Using a voltmeter, measure voltage at Green 32-pin PCM connector terminal E2. See Fig 2. If battery voltage is present, check and repair PCM connection, if necessary. If connection is okay, replace PCM. If battery voltage is not present, go to next step.
  6. Check for open in Pink/White wire between fuse block and multifunction lever connector terminal E1 or in Gray wire between multifunction lever connector terminal E2 and PCM. See Fig 1 and Fig 2. Repair as necessary. If wires are okay, replace multifunction lever.
  7. Place cruise control main switch in OFF position. Observe Tech 1 input indication. If Tech 1 indicates OFF, go to step 10). If Tech 1 indicates ON, go to next step.
  8. Disconnect PCM Green 32-pin connector. Check for battery voltage at Green 32-pin PCM connector terminal E2. See Fig 2. If battery voltage is present, go to next step. If battery voltage is not present, replace PCM.
  9. Check Gray wire between multifunction lever connector terminal E2 and PCM Green 32-pin connector terminal E2 for a short to voltage. See Fig 1 and Fig 2. Repair as necessary. If wire is okay, replace multifunction lever.
  10. Using Tech 1, observe SET/COAST switch input and RESUME/ACCELERATE (R/A) switch input. If Tech 1 indicates both inputs are OFF, go to step 13). If Tech 1 does not indicate both inputs are OFF, go to next step.
  11. Disconnect PCM Green 32-pin connector. Check for battery voltage at PCM Green 32-pin connector terminal E3 (for incorrect SET/COAST input) or terminal E4 (for incorrect R/A input). See Fig 2. If battery voltage is present, go to next step. If battery voltage is not present, replace PCM.
  12. Check for a short to battery voltage in affected wire (Dark Blue for terminal E3, Gray/Black for terminal E4). If wire is okay, replace multifunction lever.
  13. Place cruise control main switch in ON position. While observing SET/COAST and R/A inputs on Tech 1, cycle SET/COAST and R/A switches. If Tech 1 indicates input correctly with switch cycling, go to step 16). If Tech 1 does not correctly indicate inputs with switch cycling, go to next step.
  14. Check for open in Dark Blue wire between multifunction lever connector terminal E3 and PCM Green 32-pin connector terminal E3 and in Gray/Black wire between multifunction lever connector terminal E4 and PCM Green 32-pin connector terminal E4. See Fig 1 and Fig 2. Repair as necessary. If wires are okay, go to next step.
  15. While toggling SET/COAST and R/A switches, check for voltage pulse at PCM Green 32-pin connector terminal E3 (SET/COAST switch) or E4 (R/A switch). See Fig 2. If voltage pulses as switch is toggled, replace PCM. If voltage does not pulse as switch is toggled, replace multifunction lever.
  16. Disconnect cruise control servo connector. Connect a test light between servo connector terminals "A" and "C". See Fig 3. Using Tech 1, cycle C/C VENT SOLENOID on and off. If test light flashes with solenoid cycling, go to step 18). If test light does not flash with solenoid cycling, go to next step.
    Fig 3: Identifying Cruise Control Servo Connector Terminals
    G92D03694Courtesy of GENERAL MOTORS CORP.
  17. Check for continuity to ground at servo connector terminal "C" (Black/White wire). See Fig 3. Repair wire if continuity is not present. If continuity is present, check Dark Blue/White wire between servo connector terminal "A" and PCM Black 32-pin connector terminal C1 for open. Repair as necessary. If wire is okay, replace PCM.
  18. Connect test light between servo connector terminals "C" (Black/White wire) and "E" (Light Green wire). See Fig 3. Using Tech 1, cycle C/C VAC SOLENOID on and off. If test light flashes with solenoid cycling, go to next step. If test light does not flash with solenoid cycling, check for open in Light Green wire between servo connector and PCM Black 32-pin connector terminal C3. Repair as necessary. If wire is okay, replace PCM.
  19. Using Tech 1, observe servo position while manually moving servo arm. If servo position indication changes as servo is manually moved, go to next step. If servo position indication does not change as servo is manually moved, go to diagnosis of fault code 65 in appropriate G - TESTS W/ CODES article in ENGINE PERFORMANCE Section.
  20. Check vacuum supply to servo. Repair as necessary. If vacuum supply is okay, measure resistance between servo terminals "A" and "C" and between servo terminals "C" and "E". See Fig 3. If both resistances are 35-50 ohms, go to next step. If either resistance is not 35-50 ohms, replace servo.
  21. Measure resistance between servo terminals "B" and "D". See Fig 3. Manually move servo arm to full stroke, half stroke and rest positions. If resistance is 13-28 ohms at each position, go to next step. If resistance is not 13-28 ohms at each position, replace servo.
  22. Check for cracked or worn insulation on all circuits. Inspect all connections and terminals and repair as necessary. If no faults are found, go to RETRIEVING FAULT CODES.
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