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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (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 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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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