2008 GMC 5.3 sierra shifts but won't engage into gear at all. Like the trans…
Interior lights will not come on when opening the door on driver’s side. The other doors work properly. What is wrong with the interior lighting?
Most likely reason would be the driver’s door latch assembly is faulty and or the wiring harness or connection at the door latch.
Courtesy/Illuminated Entry Lamps
The BCM and the door modules communicate through the GMLAN serial data circuit for the lamp illumination commands of the door switch signals. The left and right rear door latch switches are both on one circuit that is also an input to the BCM.
The left and right front door courtesy lamps (if equipped) receive voltage and ground from the driver door switch and the passenger door switch respectively. The remaining courtesy lamps are controlled and receive voltage from the BCM. Voltage for the courtesy lamp supply voltage circuit is from the INT LTS fuse in the instrument panel fuse block.