Tools You'll Need:
* New brake light switch: Make sure you get the correct one for your specific year and model. A parts store can help you find the right one using your VIN.
* Socket wrench: Probably a 11/16" or 7/8" socket, but double-check your vehicle's specifications.
* Ratchet: To turn the socket.
* Extension (optional): Might make it easier to reach the switch.
* Wrench (optional): Some switches require a wrench to hold the switch while you loosen the nut.
* Shop rags or paper towels: To clean up any spilled brake fluid.
* Gloves: To keep your hands clean.
Procedure:
1. Disconnect the Battery: This is crucial to prevent electrical shorts. Disconnect the negative (-) terminal first.
2. Access the Brake Pedal: You'll need to get under the dash, near the brake pedal. This usually requires getting on your knees or lying down.
3. Locate the Brake Light Switch: It's usually mounted on the brake pedal assembly, directly underneath the brake pedal itself. It's a small cylindrical switch.
4. Disconnect the Electrical Connector: Carefully unplug the electrical connector from the switch. It might have a small retaining clip; gently push or squeeze this to release the connector.
5. Remove the Switch: This is where the socket wrench comes in. You'll need to remove the nut securing the switch to the brake pedal. Some switches might be held in place by a bolt. Use the appropriate wrench to loosen and remove the nut or bolt.
6. Install the New Switch: Carefully install the new brake light switch in place, making sure it's fully seated. Tighten the nut or bolt to the manufacturer's specified torque (check your repair manual if possible). Don't overtighten.
7. Reconnect the Electrical Connector: Plug the electrical connector back into the new switch, ensuring it's securely connected.
8. Test the Brake Lights: Reconnect the battery. Turn on the ignition (don't start the engine) and then press the brake pedal. Check all brake lights (taillights, center high-mount brake light, etc.) to ensure they are working correctly.
9. Clean up: Wipe up any brake fluid spills.
Important Notes:
* Brake Fluid: Be cautious when working near the brake pedal as there might be some brake fluid in the area. Avoid getting brake fluid on your skin or painted surfaces.
* Repair Manual: A repair manual specific to your 2005 Chevy Trailblazer is highly recommended. It will provide detailed diagrams and torque specifications.
* Difficulty: While generally straightforward, access can be tight. You may need to maneuver yourself to get the right angle to work on the switch.
* Professional Help: If you're uncomfortable performing this repair yourself, it's best to take your vehicle to a qualified mechanic. A brake light switch failure is a safety concern, and you want to ensure it's done correctly.
This guide provides general instructions. Always consult your vehicle's repair manual for the most accurate and detailed procedure. Remember safety first!
