Delay 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.

Windshield wiper DELAY operation is a low speed wiper motor function with a variable delay interval between the wiper motor cycles. The DELAY interval is controlled through a series of resistors within the wiper/washer switch. During DELAY wiper operation the wiper switch signal 2 circuit (Dark Green wire) is at the same voltage level used for LOW operation, but the wiper switch signal 1 circuit (Gray wire) voltage is reduced through the DELAY resistors. The windshield wiper motor module uses a capacitor feed by the wiper switch signal 1 circuit (Gray wire) to determine the frequency of the low speed wiper motor cycles. When the wiper switch signal 1 circuit (Gray wire) is at the accessory voltage level as in the LOW switch position, the capacitor charges fast causing continuous low speed wiper motor operation. The DELAY switch position indicating the longest interval between wiper motor cycles is the switch position with the highest resistance resulting in low voltage on the wiper switch signal 1 circuit (Gray wire). The low voltage charges the capacitor slowly causing a long delay interval between wiper motor cycles. As the DELAY switch is turned to positions indicating more frequent wiper cycles, the resistance through the wiper/washer switch is reduced and the wiper switch signal 1 circuit (Gray wire) voltage increases. When the wiper switch signal 1 circuit (Gray wire) voltage increases the capacitor charges faster and the delay interval between wiper motor cycles decreases.