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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the outside rearview mirror.
  2. Test for less than 1 ohm of resistance between the ground circuit and ground.
    • If greater than 1 ohm, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit and the ground circuit.
  4. Ignition ON, turn ON the rear window defogger. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp remains ON all the time, test for a short to voltage on the control circuit.
    • If the test lamp remains OFF all the time, test for a short to ground or an open/high resistance on the control circuit.
  5. If all circuits test normal, test or replace the appropriate outside heated rearview mirror face.
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