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Cruise Control Circuit

  1. Disconnect Powertrain Control Module (PCM) connector. On XJ models, PCM is located on drivers side fender. On ZJ models, PCM is located on passenger side firewall. Using external voltmeter, connect negative lead to vehicle ground.
  2. Turn ignition on. Check voltage at terminal No. 33. Voltage should be zero volts with cruise control switch in OFF position. Voltage should be battery voltage with switch in ON position. Repair harness as necessary if voltage is not correct.
  3. Check voltage at terminal No. 53. Voltage should be zero volts with cruise control switch in OFF position. Voltage should be battery voltage with switch in ON position. Repair harness as necessary if voltage is not correct.
  4. Check voltage at terminal No. 48. Voltage should be zero volts with cruise control switch off. Voltage should be battery voltage with switch on. With switch in ON position, voltage should drop to zero volts when SET button is pressed. Repair harness as necessary if voltage is not correct.
  5. Check voltage at terminal No. 50. Voltage should be zero volts with cruise control switch in ON or OFF position. With cruise control switch in SET or RESUME position, voltage should be battery voltage. Repair harness as necessary if voltage is not correct.
  6. Check voltage at terminal No. 49. Voltage should be zero volts with cruise control switch off. Voltage should be battery voltage with switch on. With cruise control switch in SET or RESUME position, voltage should be battery voltage. Repair harness as necessary if voltage is not correct.
  7. Using external ohmmeter, check resistance between terminal No. 29 of PCM connector and vehicle ground. Pressing brake pedal, ohmmeter should display continuity with pedal released. With brake pedal depressed, ohmmeter should display open circuit.
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