Circuit Description
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 PCM receives a signal from the differential clutch pump actuator check valve, indicating an overtemp condition, or a signal from the ABS controller indicating a speed differential between wheels, the AWD system is disabled. The PCM then sends a class 2 signal to the IPC, illuminating the AWD disable indicator.
Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step tests for an intermittent condition.
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This step determines if the failure is the result of a faulty instrument cluster.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: Differential Lock Schematics | |||
1 | Did you perform the Diagnostic System Check - Rear Axle Controls? | Go to Step 2 | |
Verify the fault is present. Does the system operate normally? | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | |
Does the AWD Disable indicator turn ON? | Go to Step 4 | Go to Step 5 | |
4 | Replace the PCM. Refer to Powertrain Control Module Replacement in Engine Controls - 3.4L. Did you complete the replacement? | Go to Step 6 | -- |
5 | Replace the instrument panel cluster. Refer to Instrument Cluster Replacement in Instrument Panel, Gages, and Console. Did you complete the replacement? | Go to Step 6 | -- |
6 | Operate the system in order to verify the repair. Did you correct the condition? | System OK | Go to Step 3 |
