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July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Circuit/System Testing

  1. Ignition OFF, disconnect the REAR DEFOG relay.
  2. Ignition OFF, test for less than 1.0 ohm of resistance between the relay coil ground circuit terminal and ground.
    • If greater than the specified range, test the relay coil ground circuit for an open/high resistance.
  3. Connect a test lamp between the relay coil control circuit terminal and the relay coil ground circuit terminal.
  4. Ignition ON, command the Rear Defogger Grid 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 HVAC 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 HVAC control module.
  5. If all circuits test normal, test or replace the REAR DEFOG relay.
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