Circuit/System Verification
- Ignition ON, observe the scan tool Rear Defog Switch parameter while pressing the rear window defogger switch. The parameter should change between Active and Inactive.
- If the value does not change between the commanded states, refer to Rear Window Defogger Switch Malfunction .
- 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 Window Defogger Malfunction .
- If the rear window defogger indicator is always ON or always OFF, refer to Rear Window Defogger Indicator Malfunction .