Windshield Wipers: Notes

Operation of the wipers and washers is controlled by the CJB (central junction box) in response to driver inputs from the wiper control switch and signals from the rain/light sensor. The IC monitors the condition of the wiper/washer control switch and transmits driver requests to the CJB over the medium speed CAN bus.

The wiper control switch is connected via hardwired connections to the IC. The IC outputs on 4 wires a reference voltage to the wash/wipe switch, the auto wiper switch, the wiper switch and the flick wipe switch. All the switches are connected to the IC on a common ground. Each switch function is connected to ground via a resistor or series of resistors and the IC monitors the ground signal and determines which function has been selected. The IC then outputs the appropriate message on the medium speed CAN bus to the CJB which responds to the requested wiper function. The CJB then activates the appropriate function either directly or via relays in the EJB (engine junction box) for the wipers and headlamp washers.