Heated Glass Element Switch: Description and Operation
SWITCH-REAR WINDOW DEFOGGERDESCRIPTION
The switch for the rear window defogger (EBL) system (2) is integrated into the A/C-heater control (1), which is located in the center of the instrument panel. When the rear window defogger switch is activated, the timing circuit integral to the A/C-heater control operates the rear window defogger (EBL) relay. An amber indicator (3) in the rear window defogger switch will illuminate to indicate when the EBL system is turned on. When the EBL relay is activated, current is directed to the rear window defogger grid lines and when equipped, to the heated outside rear view mirrors. The grid lines heat the window and mirror glass to help clear the surfaces of fog or frost.
OPERATION
An amber indicator in the rear window defogger switch will illuminate when the rear window defogger switch is activated. When the switch is activated, the A/C-heater control requests the front control module (FCM) to operated the rear window defogger (EBL) relay via the controller area network (CAN) B bus. The EBL relay controls the current flow to the heating grid of the rear window and when equipped, the heated outside rear view mirrors.
NOTE: The EBL system turns off automatically after approximately 15 minutes of initial operation. Each following activation cycle of the EBL system will last approximately 10 minutes.
The EBL system will be automatically turned off after an initial programmed time interval of about 15 minutes as long as the ignition switch is the Run position. After the initial time interval has expired, if the rear window defogger switch is turned on again during the same ignition cycle, the EBL system will automatically turn off after about 10 minutes. The EBL system will also turn off if the ignition switch is turned to any position other than Run or by manually pressing the rear window defogger switch a second time.
The rear window defogger switch and the rear window defogger LED indicator cannot be repaired and, if faulty or damaged, the A/C-heater control must be replaced