Front Wiper & Washer

Circuit Description

All functions of the front wiper and washer circuit are controlled by the position of the front wiper and washer switch. The wiper switch has 4 positions: OFF, INT, LO and HI.

Wiper operation
1. Low (LO) and High (HI) position
The front wiper motor has two separate brushes for low and high speed operation, When the wiper switch is in LO or HI position, ground is applied to the appropriate brushes through the wiper switch in the multifunction switch.

2. INT position
When the wiper switch is turned to INT, the ETACM receives the INT signal and INT delay time signal. According to these signals, the control module controls the operation of the front wiper through wiper motor relay coil control. Ground is applied to the low speed brush of the front wiper motor through the closed contact of the wiper motor relay.

The remainder of the wipers sweep is controlled by the park circuit. The cycle repeats as long as the wiper switch is in INT and the pause interval between sweeps is determined by the ETACM.

3. 0FF position
When the wiper switch is turned to OFF from another position (I INT, LO and HI) and the wiper is not at the rest (out of park) position, the low speed brush of the front wiper motor is grounded through the parking switch in the front wiper motor.

Washer operation
The front wiper motor operates as long as the washer switch is pulled. When the washer switch is pulled, the control module controls the low speed operation of the front wiper motor through the wiper motor relay control.