Aerio L4-2.3L (2006)
Rear Defogger Switch: Testing and Inspection
Rearend Door Window / Back Window Defogger Switch And Its Circuit Inspection
NOTE: Refer to Inspection of HVAC Control Module and its Circuit for terminal number of HVAC control module.
1. Remove HVAC control module referring to HVAC Control Module Removal and Installation.
2. Turn ignition switch to ON position.
3. Check that the voltage between G77-3 terminal of HVAC control module connector and ground for 10 V or more.
If check result is not satisfied, check rear defogger relay and its circuit.
4. Connect HVAC control module connector to HVAC control module with ignition switch turned OFF.
5. Measure voltage between G77-3 terminal of HVAC control module connector and ground.
Ignition switch ON, Rear defogger switch OFF
Higher than 10 V
Ignition switch ON, Rear defogger switch ON
Less than 0.5 V
If check result is satisfied, rear defogger switch is in good condition.
If check result is not satisfied, replace HVAC control module assembly.
