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Home >> Cadillac >> 2008 >> XLR Base >> Repair and Diagnosis >> Body & Frame >> Mirrors >> Mirror Systems >> Diagnostic Information and Procedures >> Heated Mirrors Inoperative >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the inoperative outside rearview mirror.
  2. Test for less than 1.0 ohm of resistance between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal E and the ground circuit terminal B.
  4. Command the inoperative mirror heater ON and OFF with a scan tool. The test lamp should turn ON and OFF when changing between the commanded states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the inoperative door control module.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the inoperative door control module.
  5. If all circuits test normal, test or replace the inoperative outside rearview mirror.
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