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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1575 (Wiper System & Washer System) >> Diagnostic Information and Procedures >> DTC B3810 or B3811: Washer Relay Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2003 Oldsmobile Bravada, 2003 GMC Envoy XL, 2003 GMC Envoy, and 2003 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.

Battery positive voltage is supplied to the coil and switch sides of the rear washer and headlamp washer relays. The BCM energizes a relay by grounding the relay coil through the relay control circuit. When a relay is energized the relay switch is closed and battery positive voltage is supplied to the washer pump control circuit.

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