How to Change the Brake Light Bulb on a 2007 TrailBlazer


In 1983, Chevrolet introduced a mid-sized SUV to the market, known as the Blazer. The Blazer gave drivers the usefulness of an SUV, without the bulk of a full-sized SUV. In 2002, the Trailblazer replaced all four-door Blazers and finally, in 2006, the Trailblazer replaced the Blazer altogether. The 2007 Trailblazer came standard with a 4.2-liter, in-line six-cylinder engine that produced 291 horsepower and 277 foot-pounds of torque. The 2007 Trailblazer's styling was similar to that of its Blazer predecessor, including the vertical taillight assemblies. Replacing the brake light bulbs in these vertical taillight assemblies is a relatively easy task.

Things You'll Need

  • Phillips screwdriver
  • Style 3157 taillight bulb
  • Open the rear hatch and remove the two screws on the inner part of the taillight assembly with a Phillips screwdriver.

  • Pull the taillight assembly rearward to remove it from the Trailblazer's body. Unplug the wiring harness from the rear of the taillight assembly, by pressing the locking button and pulling the harness away from the assembly.

  • Turn the taillight assembly over and remove the three screws holding the socket plate -- the roughly 2-by-5-inch plastic plate on the rear of the taillight assembly. Pull the socket plate from the taillight assembly; notice the bulbs remain attached to the plate.

  • Pull the burnt-out brake bulb from the socket plate with a slight wiggling motion. Grab a new 3157 brake light bulb with a clean, lint-free cloth and press it into the socket. Never touch the glass part of the bulb with your bare hands, as the oils from your hands can cause the bulb to burn out prematurely.

  • Set the socket plate back on the rear of the taillight assembly and tighten the three screws with a Phillips screwdriver.

  • Plug the wiring harness back into the socket plate and set the taillight assembly back on the rear of the Trailblazer. Tighten the two screws on the inner part of the taillight assembly with a Phillips screwdriver.

  • Close the Trailblazer's hatch.

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