| Subject: | IPC Backlighting Inoperative TBC 2A Fuse Open |
| Models: | 2003-2006 Cadillac Escalade, Escalade ESV, Escalade EXT |
| 2003-2006 Chevrolet Avalanche, Suburban, Tahoe |
| 2003-2006 GMC, Yukon, Yukon Denali, Yukon XL, Yukon Denali XL |
| 2003-2007 Chevrolet SIlverado Classic |
| 2003-2007 GMC Serria Classic |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
Some customer may bring in their vehicle stating that the Instrument Panel Dimming is inoperative. After initial inspection, you may notice the TBC 2A fuse that is located in the left IP fuseblock is blown.
Recommendation/Instructions:
If you experience this concern and can not isolate the source of the concern, inspect the wiring coming out of the IP relay block for a short to ground. Reports from the field have found issues with harness pictured below and the concern can usually be
located 8 inches below the IP relay block.
(See Photo Below) The arrow shows where the harness rubs on the IP relay block support bracket near the holding clip. Remove the harness from the clip and inspect carefully. Repair as needed and insulate the edge to prevent a repeat occurrence.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
