Low Speed Operation

When the wiper switch is in the LOW speed position, battery positive voltage is applied through the switch internal resistor and the wiper switch low/pulse signal circuit to the body control module (BCM). In response to this signal, the BCM energizes the wiper ON/OFF relay by applying battery voltage through the windshield wiper motor relay coil supply voltage circuit to the relay. This allows battery voltage from the WPR Fuse to flow through the switch side of the wiper ON/OFF relay and out to the switch side of the wiper HI/LO relay. Since the wiper HI/LO relay is de-energized and its switch contacts are normally closed to the low speed control circuit of the wiper motor, the motor will operate at low speed.

The wiper low speed operation and ON/OFF relay can also be commanded ON and OFF by using a scan tool. Refer to Scan Tool Output Controls .