1995 GMC Forward Control 4.3 Z, StandardFACTORY OEM SERVICE PROCEDURE

Cruise Control Does Not Engage

  1. Ensure ALT fuse is okay. Turn ignition switch to RUN position. Turn cruise control on. Check for battery voltage at Pink/Black wire terminal of cruise control switch connector and cruise control module connector.
  2. If battery voltage is not present, repair open in Pink/Black wire. If battery voltage is present, check for battery voltage at Gray wire terminal of cruise control switch connector. If battery voltage is not present, replace cruise control switch.
  3. If battery voltage is present, check for battery voltage at Gray wire terminal of cruise control module connector. If battery voltage is not present, repair open in Gray wire. If battery voltage is present, check for battery voltage between Gray and Black wire terminals at cruise control module connector.
  4. If battery voltage is not present, repair open in Black wire. If battery voltage is present, check for battery voltage at Pink/Black wire terminal of brake release switch No. 1 connector. If battery voltage is not present, repair open in Pink/Black wire. If battery voltage is present, check for battery voltage at Brown wire terminal of brake release switch No. 1 connector.
  5. If battery voltage is present, go to next step. If battery voltage is not present, adjust brake release switches. See BRAKE RELEASE SWITCHES under ADJUSTMENTS . Replace brake release switches if they cannot be adjusted.
  6. Check for battery voltage at Brown wire terminal of brake release switch No. 2 connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Brown wire between brake release switches.
  7. Check for battery voltage at Brown wire terminal of brake release switch No. 2 connector. If battery voltage is present, go to next step. If battery voltage is not present, adjust brake release switches. See BRAKE RELEASE SWITCHES under ADJUSTMENTS . Replace brake release switches if they cannot be adjusted.
  8. Check for battery voltage at Tan wire terminal of cruise control switch connector. If battery voltage is present, go to next step. If battery voltage is not present, repair open in Tan wire.
  9. Check for battery voltage at Dark Blue wire terminal of cruise control switch connector. If battery voltage is present, replace cruise control switch. If battery voltage is not present, check for battery voltage at Dark Blue wire terminal of cruise control switch connector while pressing SET switch.
  10. If battery voltage is not present, replace cruise control switch. If battery voltage is present, check for battery voltage at Dark Blue wire terminal of cruise control module connector. If battery voltage is not present, repair open in Dark Blue wire.
  11. If battery voltage is present, check for battery voltage at Dark Green wire terminal of cruise control switch connector while pressing RESUME/ACCEL switch. If battery voltage is not present, replace cruise control switch.
  12. If battery voltage is present, check for battery voltage at Dark Green wire terminal of cruise control module connector. If battery voltage is not present, repair open in Dark Green wire.
  13. If battery voltage is present, raise and support vehicle with drive wheels off of ground. While slowly turning drive wheels, check voltage between Pink/Black and Dark Green wire terminals of cruise control module connector.
  14. If voltage pulses between zero and battery voltage, replace cruise control module. If voltage does not pulse between zero and battery voltage, or if no voltage is present, check vehicle speed sensor circuit.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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