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Cruise Control Does Not Engage

  1. Ensure BRAKE (10-amp) and STOP/HAZ (20-amp) fuses are okay. Turn ignition off. Disconnect cruise control module connector. Turn ignition on. 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 or short to ground in Brown wire.
  2. Connect test light between cruise control module connector terminals "F" (Brown wire) and "E" (Black/White wire). If test light glows, go to next step. If test light does not glow, repair open in Black/White wire.
  3. Turn cruise control on. 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.
  4. 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.
  5. Connect test light between cruise control module connector terminal "A" (Gray wire) and ground. If test light glows, go to step 7). If test light does not glow, go to next step.
  6. Connect test light between cruise control switch connector terminal A13 (Brown wire) and ground. If test light glows, check for open in Gray wire. If circuit is okay, replace cruise control switch. If test light does not glow, repair open in Brown wire.
  7. Ensure ignition is on. Connect test light between cruise control module connector terminal "D" (Purple wire on A/T, Brown/White wire on M/T) and ground. If test light glows, go to step 10). If test light does not glow, go to next step (M/T) or step 9) (A/T).
  8. Connect test light between clutch pedal position switch connector terminal "B" (Purple wire) and ground. If test light does not glow, go to next step. If test light glows, check for open in Brown/White wire. If circuit is okay, replace clutch pedal position switch.
  9. Connect test light between brakelight switch connector terminal "D" (Brown wire) and ground. If test light glows, check for open in Purple wire. If test light does not glow, repair open in Brown wire.
  10. Ensure ignition is on. Connect test light between cruise control module connector terminal "B" (Dark Blue wire) and ground. Press and hold SET/COAST button. If test light glows, go to next step. If test light does not glow, check for open in Dark Blue wire. If circuit is okay, replace cruise control switch.
  11. Turn ignition switch to OFF position. Connect cruise control module. Disconnect PCM connector C2, or VCM connector C4. Turn ignition switch to RUN position. Using a DVOM, measure voltage at PCM connector C2, terminal "K" (Brown Wire), or VCM connector C4, terminal No. 3 (Dark Green/White wire). If reading is about 7 volts, go to next step. If reading is not about 7 volts, check for short to ground or open in Brown or Dark Green/White wire. If circuit is okay, replace cruise control module.
  12. Turn ignition off. Reconnect VCM/PCM connector. Set parking brake. Start engine. Turn cruise control off. Turn cruise control off. After 3 seconds, press and hold SET/COAST button. Press and hold RESUME/ACCEL switch. Fully depress and hold brake pedal. After 10 seconds, release brake pedal. If engine RPM momentarily increases, check for poor connections at VCM/PCM. If connections are okay, replace VCM/PCM. If engine RPM does not momentarily increase, replace cruise control module.
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