Description And Operation: Operation
There is a single ground signal sent by the SCCM to the Body Control Module (BCM) that manages all the windshield wiper commands: from the SCCM connector to the BCM connector; the signal sent is coded via resistive dividers so that multiple information can be sent from the SCCM to the BCM via a single connection. Similarly, the windshield washer controls are sent from the SCCM connector to the BCM connector. The BCM receives direct battery power via the circuit protected by a maxi fuse on the Battery Distribution Unit (BDU) on the battery. The BCM receives an ignition-operated power supply (INT) from the Radio Frequency Hub Module (RFHM).
According to the chosen function, the BCM sends the control signals to the windshield wiper motor by means of a Local Interface Network (LIN) bus. The windshield wiper motor is powered directly from the battery through the circuit protected by a fuse in the engine compartment Power Distribution Center (PDC).
The BCM sends a command which operates the windshield washer pump: this sends the washer fluid to the front of the windshield wiper. The power for the pump is controlled by a relay and protected by a fuse in the BCM.
The windshield washer fluid level sensor, on the cap of the reservoir, provides a signal to the BCM.
The Light Rain Sensor Module (LRSM) receives a power supply from the INT circuit protected by a fuse in the BCM and sends the BCM the automatic activating signal via the LIN bus. The BCM is connected via the Controller Area Network (CAN) bus to the Instrument Panel Cluster (IPC) to manage the windshield washer fluid level indication and relevant indicators in case of fault to the wiper motor or to the LRSM.