The rear glass defogger switch inputs can be checked using the GDS.

To check the input value of rear glass defogger switch, select option "Body Control Module".

Select option "Current Data" of "smart junction box".

To check the input value of windshield deicer switch in force mode, select option "Actuation Test" of "smart junction box".

Disconnect the negative(-) battery terminal.

Remove the center fascia panel (A) after loosening the mounting screws.

Disconnect the heater control unit connector (B) and hose (A).

Remove the heater control unit contained the rear glass defogger switch from the center fascia panel.

Install the heater control unit.

Install the center fascia panel.