Hello all, I have a 2003 GMC Envoy SLE. Recently got pulled over because passenger side brake light not working. Changed the bulb and no go. All the other lights work, including the same bulb with the running lights. Any ideas on what this could be would help and be appreciated.
Passenger side brake light not working all others are
- Thread starter noahdomani
- Start date
FYI... Your Profile should indicate the Engine as a "4.2L In-line Six".
(1) Check for Powers and Grounds on the Passenger Brake Light Harness.
(2) Do NOT assume that your Replacement Bulb is GOOD. Test it in the Driver's Side Brake Light Socket.
(3) The Rear Tail Lights on the Trailblazer have Gray Circuit Boards that can Melt and FAIL. Follow this Video for How To Test this item out:
Follow THIS Video for MORE Tail Light-Brake Light Diagnostics. Ignore this Dude's Shenanigans ...He is obviously working on a Junk Yard SUV for this Demo:
(1) Check for Powers and Grounds on the Passenger Brake Light Harness.
(2) Do NOT assume that your Replacement Bulb is GOOD. Test it in the Driver's Side Brake Light Socket.
(3) The Rear Tail Lights on the Trailblazer have Gray Circuit Boards that can Melt and FAIL. Follow this Video for How To Test this item out:
Follow THIS Video for MORE Tail Light-Brake Light Diagnostics. Ignore this Dude's Shenanigans ...He is obviously working on a Junk Yard SUV for this Demo:
Last edited:
Dorman Gray Tail Light Circuit Boards are available for under $17.00 over on Amazon:
