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Circuit/System Testing

  1. Ignition OFF, disconnect the X2 harness connector at the radio and the X2 harness connector at the CIM.
  2. Verify that a test lamp does not illuminate between B+ and the CIM X2 harness connector terminal 1.
    • If the test lamp illuminates, test the signal circuit for a short to ground.
  3. Verify that a test lamp does not illuminate between B+ and the CIM X2 harness connector terminal 2.
    • If the test lamp illuminates, test the signal circuit for a short to ground.
  4. Test for less than 1 ohm between the CIM X2 harness connector terminal 1 and the radio X2 harness connector terminal 7.
    • If greater than the specified range, test the circuit for a short to voltage or an open/high resistance.
  5. Test for less than 1 ohm between the CIM X2 harness connector terminal 2 and the radio X2 harness connector terminal 15.
    • If greater than the specified range, test the circuit for a short to voltage or an open/high resistance.
  6. Reconnect the CIM X2 harness connector.
  7. Ignition ON, test for a momentary AC voltage between the signal circuit radio X2 harness connector terminal 7 and the signal return circuit terminal 15 when the white dot button on the OnStar keypad is pressed.
    • If AC voltage was not present, replace the CIM.
  8. If all circuits test normal, replace the radio.
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