System Circuit Diagram for the Wiper/washer System

Fig 1: Wiper/Washer System Circuit Diagram

Courtesy of BMW OF NORTH AMERICA, INC.

COMPONENTS DESCRIPTION CHART

Index	Explanation
1	ZGM central gateway module
2	Wiper motor
3	Heated washer jet on the driver's side
4	Heated washer jet in the center of the vehicle
5	Heated washer jet on the front-passenger side
6	Outside temperature sensor
7	Washer fluid level sensor
8	Washer fluid pump motor
9	Motor, headlight washer
10	Front distribution box
11	Junction box electronics (JB)
12	Wiper switch on the steering column stalk
13	Steering column switch cluster (SZL)
14	Instrument cluster
15	Rain/lights/solar/condensation sensor
16	Roof functions center (FZD)
KI. 30	Terminal 30
KI. 30B	Terminal 30 basic operation
K-CAN2	Body CAN2
PT-CAN	Powertrain CAN
LIN-Bus	Local Interconnect Network bus

The signal produced when the wiper switch on the steering column stalk (12) is operated is sent from the SZL steering column switch cluster (13) via the FlexRay to the central gateway module (1). The central gateway module transmits the signal on the K-CAN2. The junction box electronics (11) switch the wiper motor (2) on, for example and monitor its function.

The washer fluid pump (8) is switched on or off by the junction box electronics.

On vehicles with automatic driving lights control, the rain/lights/solar/condensation sensor (15) sends the request to switch on the wiper motor, for instance, via the LIN bus. The junction box electronics receives the request and implements it.

The roof function center (16) supplies the voltage for the rain/lights/solar/condensation sensor.

K-CAN2 signals to the junction box electronics

K-CAN SIGNALS CHART

In/Out	Information	Source/Recipient	Function
In	Vehicle speed	Wheel speed sensor > Dynamic Stability Control	Wiper speed setting depending on vehicle speed
Out	Wiper status	Wiper motor > Junction box electronics	Information for driver assistance systems that involve a video camera at the base of the rear view mirror