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Circuit/System Testing

Remote Door Locks Malfunction

  1. Ignition OFF, disconnect the harness connector at the OnStar interface module.
  2. Ignition ON, test for less than 1 volt between the signal circuit terminal 3 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  3. Test for infinite resistance between the signal circuit terminal 3 and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  4. If all circuits test normal, replace the OnStar interface module.

Remote Horn Malfunction

  1. Ignition OFF, disconnect the harness connector at the OnStar interface module.
  2. Ignition ON, test for less than 1 volt between the signal circuit terminal 4 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage.
  3. Test for infinite resistance between the signal circuit terminal 4 and ground.
    • If not the specified value, test the signal circuit for a short to ground.
  4. If all circuits test normal, replace the OnStar interface module.
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