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Home >> Buick >> 2012 >> Regal Base >> Repair and Diagnosis >> External Pages >> Different car >> Section 314 (Fixed And MOVEABLE Window System) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2013 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine running.
  2. Verify the scan tool Rear Defogger Switch parameter changes between On and Off when pressing the rear window defogger switch.
    • If the parameter does not change between On and Off 

      Replace the A26 HVAC Controls.

    • If the parameter changes between On and Off 
  3. Verify the E18 Rear Defogger Grid turns ON and OFF when commanding the Rear Defogger On and Off with a scan tool.
    • If the E18 Rear Defogger Grid turns ON and OFF 
  4. Verify the rear defogger indicator turns ON and OFF when pressing the rear window defogger switch.
    • If the rear defogger indicator does not turn ON and OFF 

      Replace the A26 HVAC Controls.

    • If the rear defogger indicator turns ON and OFF 
  5. All OK.
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