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Home >> Chevrolet >> 2006 >> Cobalt LTZ >> Repair and Diagnosis >> External Pages >> Different car >> Section 728 (Fixed & MOVEABLE Window Systems) >> Diagnostic Information and Procedures >> Rear Window Defogger Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2008 Pontiac G5 and 2008 Chevrolet Cobalt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON, observe the scan tool Rear Defog Relay Cmd parameter while pressing the rear window defogger switch. The parameter should change between On and Off.
    • If the value does not change between the commanded states, refer to Rear Window Defogger Switch Malfunction in Circuit/System Testing .
  2. Command the Rear Defog Relay 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 in Circuit/System Testing .
    • If the Defogger Indicator is always ON or always OFF, refer to Rear Defogger Indicator Malfunction in Circuit/System Testing .
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