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Home >> Pontiac >> 2009 >> Solstice Base, 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 160 (Fixed And MOVEABLE Windows System) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Testing >> Rear Window Defogger Switch Malfunction

Rear Window Defogger Switch Malfunction

WARNING: This page is about a different car, the 2010 Pontiac G5 and 2010 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the X2 harness connector at the HVAC control module.
  2. Test for less than 1 ohm between the ground circuit terminal A5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, verify the scan tool Rear Defog Relay Cmd parameter is Off.
    • If not the specified value, test the signal circuit terminal A8 for a short to ground. If the circuit tests normal, replace the BCM.
  4. Install a 3A fused jumper wire between the signal circuit terminal A8 and ground. Verify the scan tool Rear Defog Relay Cmd parameter is On.
    • If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM.
  5. If all circuits test normal, test or replace the HVAC control module.
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