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Home >> GMC >> 1998 >> C3500 HD 7.4 J, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (Transfer Case - Diagnosis - New Venture 246) >> DTC Tests >> DTC B0768: Service 4WD Light Circuit High >> Circuit Description

Circuit Description

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 1998 GMC Yukon, 1998 GMC Suburban, 1998 GMC Pickup, 1998 GMC Cab & Chassis, and 1998 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.

Automatic Transfer Case (ATC) control module controls SERVICE 4WD light, located in instrument cluster, by grounding Light Blue/Black wire circuit. Voltage to light is supplied via GAUGE FUSE (Pink wire circuit) from instrument panel fuse block. See WIRING DIAGRAMS  .

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