Battery Draw ISLPS Fuse Blown Courtesy And Dimming Lamps Inop - keywords BCM dome dead inoperative interior light open overhead

This PI was superseded to update Recommendation/Instructions. Please discard PIT4050C.

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Some customers may comment of the courtesy/reading/sunshade (circuit 6815) and certain LED Backlighting (circuit 6817) lamps are inoperative and the ISLPS/IS Lamps fuse is blown. The ISLPS fuse is a power feed to the BCM and it uses the power from this fuse to feed some of its outputs. One of the outputs is the inadvertent power supply to the courtesy/reading/sunshade lamps on circuit 6815 orange wire. A second is circuit 6817 for LED Backlighting. If either of these circuits (6815 or 6817) short to ground the ISLPS/IS Lamps fuse may blow.

Reports of circuit 6815 chaffing or shorting to ground at the overhead DVD screen or at the sunshades have been received. To correct this concern, repair the short and reroute harness so it does not reoccur.

If circuit 6815 is chaffing or partially shorted to ground it may not blow the ISLPS/IS Lamps fuse but intermittently wake up the BCM and cause a battery draw.

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.