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Cruise Control Systems: Diagnosis: Notes

  1. If vehicle speed cannot be set or controlled, check for fault codes and initiate inspection mode (inspection codes). See RETRIEVING FAULT CODES and INITIATING INSPECTION MODE.
    NOTE: Check voltage at cruise control unit connector terminals with ignition on and connector attached (backprobe terminals). See CRUISE CONTROL UNIT under COMPONENT TESTING.
  2. If no fault codes are set and all inspection codes are okay, check METER and STOP fuses. Replace fuse(s) if open (repair wiring if necessary). If fuses are okay, turn ignition and main switches on. Measure voltage at terminal "E" (Yellow wire) of cruise control unit connector. SeeFigure . If voltage is not as specified, check main switch. See MAIN SWITCH under COMPONENT TESTING.
  3. If voltage is as specified, measure voltage at terminal "T" (Black wire) of cruise control unit connector. If voltage is not as specified, repair Black wire (ground circuit). If voltage is as specified, measure voltage at terminal "M" (Green wire) of cruise control unit connector. If voltage is not as specified, check stoplight switch. See STOPLIGHT SWITCH under COMPONENT TESTING.
  4. If voltage is as specified, measure voltage at terminal "H" (Violet wire) of cruise control unit connector. If voltage is not as specified, check cruise brake switch. See CRUISE BRAKE SWITCH under COMPONENT TESTING. If voltage is as specified, go to next step (M/T) or measure voltage at terminal "G" (White wire) of cruise control unit connector (A/T). If voltage is not as specified, check PCMT. See ELECTRICAL COMPONENT LOCATIONS table under DESCRIPTION & OPERATION. If voltage is as specified, go to next step.
  5. Measure voltage at terminal "P" (Green/Red wire) of cruise control unit connector. If voltage is not as specified, check vehicle speed sensor. See VEHICLE SPEED SENSOR under COMPONENT TESTING. If voltage is as specified, measure voltage at terminal "N" (Red wire) of cruise control unit connector. If voltage is not as specified, check cruise control switch. See CRUISE CONTROL SWITCH under COMPONENT TESTING.
  6. If voltage is as specified, measure voltage at terminals "A" (Green/Blue wire), "B" (Green/Black wire), "C" (Green/Yellow wire) and "O" (Pink wire) of cruise control unit connector. If voltage is not as specified, check actuator. See ACTUATOR under COMPONENT TESTING. If voltage is as specified, measure voltage at terminal "E" (Yellow wire) of cruise control unit connector.
  7. If voltage is not as specified, check main switch. See MAIN SWITCH under COMPONENT TESTING. If voltage is as specified, measure voltage at terminal "F" (Gray wire) of cruise control unit connector. If voltage is not as specified, check main switch. See MAIN SWITCH under COMPONENT TESTING.
  8. If voltage is as specified, measure voltage at terminals "A" (Green/Blue wire), "B" (Green/Black wire), "C" (Green/Yellow wire) and "O" (Pink wire) of cruise control unit connector while using chassis dynamometer to simulate driving vehicle at 31 MPH (50 km/h). Turn main switch on. With SET switch button released, about 9 volts should be present at each terminal.
  9. With SET button pressed and held, voltage should be as follows:
    • Terminal "A" - About 0-12 Volts
    • Terminal "B" - About 0-12 Volts
    • Terminal "C" - About 1 Volt
    • Terminal "O" - Battery Voltage.
  10. If voltage is not as specified, replace actuator. If voltage is as specified, check for faulty actuator cable. If actuator cable is okay, replace cruise control unit.
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