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Circuit/System Verification

WARNING: This page is about a different car, the 2011 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running, observe the scan tool Rear Defogger Switch parameter while pressing the heated rear window switch. The parameter should change from Inactive to Active.
    • If the value does not change, replace the A26 HVAC control.
  2. Observe the operation of the rear window defogger indicator while pressing the heated rear window switch. The indicator should turn ON or OFF each time the heated rear window switch is pressed.
    • If the indicator does not turn ON or OFF with each switch press, replace the A26 HVAC control.
  3. Command the E18 rear window defogger grid ON and OFF with a scan tool, the E18 rear window defogger grid should turn ON or OFF while changing between the commanded states.
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