Test Description
WARNING: This page is about a different car, the 2005 GMC Yukon XL and 2005 GMC Yukon. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 2: This step determines whether the failure is the result of a malfunctioning transfer case shift control module or the IPC.
Service Indicator Always On
| Step | Action | Yes | No |
|---|---|---|---|
| Schematic Reference: Transfer Case Control Schematics Connector End View Reference: Transfer Case Control Connector End Views |
|||
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Observe the Service 4WD parameter input/output in the instrument panel cluster (IPC) Scan Tool Data List. Is the Service 4WD indicator commanded ON? |
Go to Step 3 | Go to Step 4 |
| 3 | Replace the transfer case shift control module. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair? |
Go to Step 5 | - |
| 4 | Replace the IPC. Refer to Instrument Panel Cluster (IPC) Replacement
in Instrument Panel, Gages, and Console. Did you complete the repair? |
Go to Step 5 | - |
| 5 |
|
Go to Step 1 | System OK |