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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 117 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> DTC B3922 - Front Wiper Select Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

The body control module (BCM) monitors the windshield wiper switch low signal circuit. When the wiper switch is placed in a low position, a signal is applied to the BCM through the windshield wiper switch low signal circuit. The BCM then applies a battery positive voltage to the WIPER relay control circuit which energizes the WIPER relay, allowing the battery positive voltage from WIPER/WS fuse through the switched side of the WIPER relay to the windshield wiper motor.

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