The 2004 Chevy TrailBlazer is a mid-sized SUV available in three styles: the base LS, the luxury LT and the high-performance SS. If one of the brake lights stops working, it is important to change it right away. Regardless of the style of your TrailBlazer, instructions for replacing a brake light bulb are the same.
Raise the liftgate on the TrailBlazer.
Remove the two screws holding the tail lamp assembly in place. They are located along the side of the assembly closest to the vehicle.
Remove the assembly out of the vehicle sideways. For example, if you are removing the driver's side assembly, pull it out to the left. For the passenger side assembly, pull it out to the right.
Detach the wiring harness from the lamp assembly.
Remove the three retaining screws from the bulb assembly. Two of the screws are directly across from each other between two of the sockets, and the third is located at the end.
Press the release tabs for the socket with the bulb you wish to replace and pull it out.
Push in the new bulb. It will snap into place.
Push the socket back into the bulb assembly and reinstall the three screws.
Reattach the wiring harness.
Reinstall the lamp assembly in the vehicle by screwing it back into place.
