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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1143 (Drive Axle - Limited-Slip Differential) >> Diagnostic Information and Procedures >> Differential Lock Indicator Inoperative >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.

The all-wheel drive (AWD) disable indicator lamp is located in the instrument panel cluster (IPC). Ignition 1 voltage is supplied to the IPC when the ignition switch is in the START or RUN position. When the powertrain control module (PCM) or the transmission control module (TCM) receives a signal from the differential clutch pump actuator check valve, indicating an overtemperature condition, or a signal from the antilock brake system (ABS) controller indicating a speed differential between wheels, the AWD system is disabled. The PCM/TCM then sends a class 2 signal to the IPC, illuminating the AWD disable indicator.

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