The third brake light, or center high-mounted stop lamp (CHMSL), on your 2007-2018 Jeep Wrangler JK is a crucial safety feature. A malfunctioning light can significantly reduce your vehicle's visibility during braking, potentially leading to accidents. This comprehensive guide covers common issues, troubleshooting steps, and upgrade options for your JK's third brake lamp.
Why is My Jeep Wrangler JK's Third Brake Light Not Working?
This is a frequent question among JK owners. Several factors can cause your third brake light to fail. Let's explore some of the most common culprits:
- Burned-out Bulb: This is the simplest and most common reason. The bulb itself might have simply reached the end of its lifespan. Replacing it is a relatively straightforward process.
- Faulty Wiring: Damage to the wiring harness leading to the third brake light can interrupt the electrical circuit. This could be due to corrosion, wear and tear, or even accidental damage.
- Fuse Issues: A blown fuse in the vehicle's fuse box can also prevent the light from functioning. Checking and replacing the fuse is a quick troubleshooting step.
- Brake Light Switch Problem: While this affects all brake lights, a malfunctioning brake light switch can prevent the third brake light from working. This switch is usually located near the brake pedal.
- Control Module Malfunction: In more complex scenarios, a problem with the vehicle's body control module (BCM) could be the root cause. This requires professional diagnosis.
How Do I Replace the Third Brake Light Bulb on My Jeep Wrangler JK?
Replacing the bulb is generally a simple DIY task. However, the exact steps might slightly vary depending on your JK's trim level and year. Consult your owner's manual for specific instructions. Generally, it involves:
- Accessing the light assembly: This usually requires removing the interior trim panel above the rear window.
- Unplugging the electrical connector: Carefully disconnect the connector from the bulb housing.
- Removing the old bulb: Gently twist and remove the old bulb.
- Installing the new bulb: Insert the new bulb, ensuring it's securely seated.
- Reassembling everything: Reattach the electrical connector and replace the interior trim panel.
What Kind of Bulb Does My 2007-2018 Jeep Wrangler JK Third Brake Light Use?
The specific bulb type will depend on the year and model of your Wrangler JK. Check your owner's manual for the correct bulb type. It's crucial to use the correct bulb to ensure proper fit and function. Using an incorrect bulb can lead to further issues or even damage to the light assembly.
Can I Upgrade My Jeep Wrangler JK's Third Brake Light?
Yes, you can upgrade your JK's third brake light to enhance its visibility and aesthetics. Several aftermarket options exist, including:
- LED Bulbs: LED bulbs offer increased brightness and longer lifespan compared to standard incandescent bulbs.
- Complete LED Light Assemblies: These assemblies replace the entire third brake light unit with an LED version, providing a cleaner look and improved illumination. Some even offer sequential brake light functionality.
- Third Brake Light Extensions: Some Jeep enthusiasts install additional brake lights on their roll bars or other exterior locations to further improve rear visibility.
Remember to ensure any upgrade you choose is compliant with local regulations.
How Much Does It Cost to Replace a Jeep Wrangler JK Third Brake Light?
The cost varies widely. A simple bulb replacement might only cost a few dollars for the bulb itself. However, more complex repairs involving wiring, fuse replacement, or a malfunctioning switch could cost significantly more, especially if professional assistance is required. Upgrading to an aftermarket LED assembly will vary in price depending on the brand and features.
By understanding the common causes of third brake light failure and the available solutions, you can keep your 2007-2018 Jeep Wrangler JK safe and visible on the road. Remember to always consult your owner's manual and consider seeking professional help if you are unsure about any repair or upgrade procedure.
