Windshield Washer Pump: Description and Operation

Actuating the washer portion of the column switch completes the washer pump motor circuit to ground and mechanically moves the wiper switch to the low speed position. This dual function starts the wiper motor and washer operation at the same time. The washer pump runs only while the washer switch is activated.

The washer pump consists of a permanent magnet motor and pump assembly that is mounted to the top of the washer reservoir. The wiper motor can be operated only when the ignition switch is in the run or accessory position.