Rear Defogger Switch - Operation

OPERATION

The amber indicator lamp located in the mode control knob in the A/C-heater control will illuminate when the Electric Backlight (EBL) system is operating. When the rear window defogger switch is pressed to the On position, with the ignition switch in RUN, the switch sends a request signal over the Controller Area Network (CAN) bus to the Totally Integrated Power Module (TIPM) to energize the internal EBL high side driver. When energized, the EBL high side driver provides fused battery current to the rear window defogger grid lines and to the heated side view mirrors, when equipped.

NOTE: The EBL system turns off automatically after ten minutes of initial operation. Each following activation cycle of the EBL system will last five minutes.

The EBL system will be automatically turned off after an initial programmed time interval of about ten minutes as long as the ignition switch is in RUN. After the initial time interval has expired, if the rear window defogger switch is pressed to the On position again during the same ignition cycle, the EBL system will automatically turn off after about five minutes. The EBL system will automatically shut off if the ignition switch is turned to any position other than RUN, or it can be turned off manually by pressing the rear window defogger switch a second time.

The rear window defogger switch is diagnosed using a scan tool Testing and Inspection.

The rear window defogger switch and indicator cannot be adjusted or repaired and the A/C-heater control must be replaced if inoperative or damaged A/C And Heater Control - Removal.