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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 143 (Fixed And MOVEABLE Windows) >> Diagnostic Information and Procedures >> DTC B1066 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Engine Running.
  2. Verify the E18 Rear Window Defogger Grid turns ON and OFF when pressing the appropriate switch on the A26 Heater and Air Conditioning User Interface Control - Front
    • If the E18 Rear Window Defogger Grid does not turn ON or OFF 

      Refer to Circuit/System Testing

    • Go to next step: If the E18 Rear Window Defogger Grid turns ON and OFF 
  3. A fault that is not currently present may have been caused by a intermittent condition.
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