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Circuit/System Verification

WARNING: This page is about a different car, the 2007 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool BCM Rear Defog Switch parameter while pressing the rear window defogger switch. The reading should change between ON and OFF.
  2. Command the rear window defogger ON and OFF with a scan tool. The rear window defogger and rear window defogger indicator should turn ON and OFF when changing between the commanded states.
    • If the rear window defogger does not turn ON and OFF when changing between the commanded states, refer to Rear Defogger Malfunction .
    • If the Defogger indicator does not illuminate, replace the HVAC control module.
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