Download Tail Lamps/Stop Lamps Inoperative 2004 Buick Rainier – Some 2002-2004 model year Chevrolet TrailBlazer and TrailBlazer EXT, GMC Envoy and Envoy XL, Oldsmobile Bravada vehicles, and 2004 Buick Rainier vehicles have tail lamp/stop lamp(s) that may become inoperative. Service Procedure 1. Open the rear liftgate. 2. Remove the two screws that attach both the left and right tail lamp assemblies and remove the lamps from the body. 3. Inspect the part number on both the left and right tail lamp circuit boards. Chevrolet – New P/N 16532713 Chevrolet Export – New P/N 16532714 Buick and Oldsmobile – New P/N 16532715 GMC – New P/N 16532716 • If the part number printed on a circuit boards IS one of the part number listed above, then the circuit board is the new design and does NOT need to be replaced. • If the part number printed on a circuit board is NOT one of the part numbers listed above, then the circuit boards is the old design and MUST BE REPLACED. Proceed to the next step if either circuit board needs to be replaced. 4. Turn on the tail lamps, directional signals, etc. and determine if there are any bulbs that require replacement. 5. Disconnect the electrical connector from the circuit board being replaced. 6. Remove the three screws attaching the circuit board to the tail lamp and remove the circuit board. 7. Install a NEW stop lamp bulb in a NEW circuit board.