Switch-Rear Window Defogger
The switch for the rear window defogger (EBL) system (1) is located in the A/C-heater control (2) in the instrument panel center bezel (3). When the rear window defogger switch is pressed to the On position a request signal is sent to the cabin compartment node (CCN), which sends a message to the totally integrated power module (TIPM) to operate the EBL system.
When the high side driver in the TIPM is energized, current is directed to the rear defogger grid lines and to the heated side view mirrors (when equipped). The grid lines heat the glass to help clear the surface of fog or frost.