Rear window defroster function

P67.29-0214-06

Rear window defroster network

A37 PSE control module (combined)

CAN Control Area Network

N10/1 Signal acquisition and actuation module (SAM)

N18 Heater pushbutton control module

N19 A/C pushbutton control module

cc Automatic air conditioning (AAC) pushbutton control module

R1 Rear window defroster

Illustrated on sedan MODEL 210

The rear window defroster function is switched on if the rear window defroster switch in the pushbutton control module for automatic heater (N18) or air conditioning (N19) or automatic air conditioning (N22) is pressed. The switch signal is applied with voltage coding to an input of the signal acquisition and actuation module (SAM) (N10/1). The SAM (N10/1) transmits the "rear window defroster ON" command via CAN to the pneumatic system equipment (PSE), combination functions (A37). In addition, the SAM (N10/1) initializes the function LED in the rear window defroster switch. The PSE (A37) actuates the rear window defroster via a load relay.

-----------------------------------------------------------------------------------------

The SAM (N10/1) transmits the "rear window defroster OFF" signal to the PSE (A37) if

 circuit 15R off is detected,

 undervoltage < 11 V is detected,

 an ATA alarm is triggered,

 the rear window defroster switch is actuated again,

 at the latest, however, following the expiry of a delay period of 12 min.

The PSE (A37) then switches the rear window defroster off. The function LED is extinguished. In the event of a cutout due to undervoltage, the function LED in the switch flashes on and off at a frequency of 1.5 Hz.



In the case of model 210.2, the heater wire of the rear window defroster is used as a glass breakage sensor for the interior motion sensor.

-----------------------------------------------------------------------------------------