Circuit/System Verification
- Ignition ON, observe the operation of the Rear Defogger Grid while pressing the Rear Defogger Switch. The Rear Defogger Grid should ACTIVATE and DEACTIVATE when changing between commanded states.
- Command the rear window defogger indicator ON and OFF with the scan tool. The rear window defogger indicator should turn ON and OFF when changing between the commanded states.
- If the Defogger Indicator does not illuminate, replace the HVAC control module.