Wash Operation

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The windshield wiper/washer system WASH function uses 2 switch contacts within the wiper/washer switch assembly. One switch contact closes the wiper/washer switch accessory voltage supply circuit (Yellow wire) to the wiper switch signal 2 circuit (Dark Green wire). Accessory voltage on the wiper switch signal 2 circuit (Dark Green wire) causes the wiper motor module to close the wiper motor accessory voltage supply circuit (Yellow wire) to the wiper motor low speed terminal. The WASH command on the wiper switch signal 2 circuit (Dark Green wire) will cause the wiper motor to operate at low speed for as long as the switch is held in the closed position and approximately 6 seconds after being released. The other WASH switch contact in the wiper/washer switch is the control circuit to the windshield washer pump. When the WASH switch is in the held in the closed position the wiper/washer switch accessory voltage supply circuit (Yellow wire) is used to operate the windshield washer pump until the switch is released.