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Circuit/System Testing

NOTE:

The drive wheels of the vehicle must be raised and the transmission must be placed in drive or first gear. Refer to Lifting and Jacking the Vehicle .

  1. Ignition OFF, disconnect the harness connector at the rear object sensor control module.
  2. With the drive wheels raised start the engine and place the vehicle transmission in drive or the first gear. Verify that the speedometer value does not match the scan tool Vehicle Speed parameter in the ECM Engine Data List.
    • If the speedometer matches the scan tool Vehicle Speed parameter, test the vehicle speed signal circuit terminal 18 for a short to voltage, a short to ground or an open/high resistance. If the circuit tests normal, replace the rear object sensor control module.
  3. Ignition OFF, disconnect the harness connector at the inside rearview mirror (ISRVM).
  4. With the drive wheels raised start the engine and place the vehicle transmission in drive or the first gear. Verify that the speedometer value does not match the scan tool Vehicle Speed parameter in the ECM Engine Data List.
    • If the speedometer matches the scan tool Vehicle Speed parameter, test the vehicle speed signal circuit terminal 6 for a short to voltage, a short to ground or an open/high resistance. If circuit tests normal, replace the ISRVM.
  5. Ignition OFF disconnect the X2 harness connector at the engine control module.
  6. Ignition ON, test for 9-11 V between the vehicle speed signal circuit terminal 22 and ground.
    • If less than 9 V, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than 11 V, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  7. If all circuits test normal, test or replace the ECM.
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