Diagnostic Instructions
Circuit/System Description
The instrument panel cluster (IPC) illuminates the AWD Disabled indicator by supplying ground to the lamp. The rear differential clutch control module (CCM) sends a serial data messages to the IPC, in order to command the indicator ON or OFF.
Diagnostic Aids
| • | If the AWD disabled lamp turns Off, and there are no DTCs stored in any other vehicle systems, the CCM may detected incorrect size tires installed on the vehicle, or over-heating of the AWD coupling. |
| • | For incorrect tire size, check tire pressure, size and brand. All tires must have the same diameter to protect the AWD coupling. |
| • | For overheating, monitor the temperature of the AWD coupling in the scan tool and, if the temperature stays above 70 degrees C and condition for the size are correct, replace the CCM. |
Reference Information
Schematic Reference
All-Wheel Drive Schematics
Connector End View Reference
Transfer Case Control Connector End Views
Electrical Information Reference
Scan Tool Reference
Circuit/System Testing
Important: Diagnose all vehicle DTCs before using this diagnostic.
With the scan tool, select instrument panel special functions Lamp Test. Command the instrument panel warning lamps OFF.
| ⇒ | If the AWD Disabled warning lamp does not turn OFF, replace the IPC. |
| ⇒ | If the AWD Disabled lamp turns OFF and there are no DTCs stored in any vehicle systems, replace the CCM. |
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for CCM or IPC replacement, setup, and programming.
