The third brake lamp, also known as the center high-mounted stop lamp (CHMSL), on your 2007-2018 Jeep Wrangler JK is a crucial safety feature. A malfunctioning third brake lamp can significantly reduce your vehicle's visibility to other drivers, increasing the risk of rear-end collisions. This guide will walk you through common issues, troubleshooting steps, and the replacement process.
Why is My Jeep Wrangler JK Third Brake Light Not Working?
This is often the first question many JK owners ask. Several factors can contribute to a malfunctioning third brake light:
- Burned-out Bulb: The most common cause is a simple burned-out bulb. This is usually easy to diagnose and replace.
- Blown Fuse: A blown fuse in the vehicle's electrical system can interrupt power to the brake light. Check your owner's manual to locate the correct fuse.
- Wiring Issues: Damaged or corroded wiring can prevent power from reaching the brake light. This requires more in-depth troubleshooting.
- Faulty Brake Light Switch: A malfunctioning brake light switch can prevent the brake lights (including the third brake light) from illuminating when the brake pedal is pressed.
- Control Module Problems: In rare cases, a problem with the vehicle's body control module (BCM) could be the culprit. This usually requires professional diagnosis.
How Do I Test My Jeep Wrangler JK's Third Brake Light?
Testing your third brake light is straightforward:
- Visual Inspection: Start by visually inspecting the bulb. Is it visibly damaged or burned out?
- Ask a Friend: Have a friend press the brake pedal while you check if the third brake light illuminates.
- Fuse Check: Consult your owner's manual to locate and check the fuse responsible for the brake lights. Replace it if it's blown.
How to Replace a Jeep Wrangler JK Third Brake Light Bulb?
Replacing the bulb is generally a simple process:
- Access the Lamp: You'll typically need to access the lamp from inside the vehicle. Consult your owner's manual for specific instructions, as the process may slightly vary depending on the year of your JK.
- Remove the Old Bulb: Carefully remove the old bulb, taking note of its orientation.
- Install the New Bulb: Insert the new bulb, ensuring it's correctly oriented.
- Test the Light: Test the light to confirm it's working properly.
What Type of Bulb Does My 2007-2018 Jeep Wrangler JK Third Brake Light Use?
The type of bulb used in your JK's third brake light will depend on the year and trim level. Always refer to your owner's manual for the correct bulb type. Using an incorrect bulb can lead to improper functionality and potential safety hazards.
My Jeep Wrangler JK Third Brake Light Still Isn't Working After Replacing the Bulb - What Next?
If the problem persists after replacing the bulb, further troubleshooting is necessary. You should systematically check the fuse, wiring harness, and brake light switch. If you're not comfortable performing these checks, it's best to consult a qualified mechanic to avoid further damage or injury.
Can I Replace the Entire Third Brake Light Assembly?
Yes, you can replace the entire third brake light assembly. This is a more involved process and might require specific tools. Again, consult your owner's manual or seek professional assistance.
How Much Does it Cost to Replace a Jeep Wrangler JK Third Brake Light?
The cost varies depending on whether you're replacing just the bulb, the entire assembly, or if professional labor is required. A simple bulb replacement is inexpensive, while replacing the assembly or having a mechanic diagnose and fix wiring issues can be significantly more costly.
By following these steps and seeking professional assistance when needed, you can effectively troubleshoot and resolve issues with your Jeep Wrangler JK's third brake lamp, ensuring your safety and the safety of others on the road. Remember, a properly functioning third brake light is essential for safe driving.
