How to Fix Nissan 370z Brake Light Fail - You Can Do It Yourself

By Nick Marchenko, PhD

The Nissan 370z is a vehicle known for its performance and design. But as with any vehicle, certain issues can arise over time, such as brake light failure. This guide is designed to help Nissan 370z owners diagnose and fix brake light issues with a do-it-yourself approach.

Diagnosing the Issue

Before diving into the repair, it's essential to diagnose the problem correctly. Start by checking the following:

1. Fuses: Locate the driver's side foot panel and inspect the "Meter" and "Stop Lamp" fuses with an ohmmeter. Replace any blown fuses.
2. Tail/Illumi Fuse: Also, check the "Tail/Illumi" fuse and replace if necessary.
3. System Scan: If you have access to an Ecutek system or similar, run a system scan to check for any error codes that could shed light on the issue.
4. Relays: Inspect the DTRL relay in the IPDM fuse box next to the battery. A malfunction here could cause the brake lights to fail.
5. Bulbs: During some time,your brake light bulbs may burn out and stop emiting any light. Its a common issue so start with checking the condition of your bulbs. If you are not sure what bulbs to choose for a replacement - consult the chart below to find and answer.

Bulb size chart for Nissan 370Z:

• 2020;
• 2019;
• 2018;
• 2017;
• 2016;
• 2015;
• 2014;
• 2013;
• 2012;
• 2011;
• 2010;
• 2009;

Tools Required

• Ohmmeter
• Replacement fuses
• Ecutek system scanner (or similar)
• Butt connectors
• Wire crimping tool

Step by Step Repair Guide

Step 1: Fuse Inspection and Replacement

1. Locate the driver's side foot panel.
2. Use the ohmmeter to test the "Meter" and "Stop Lamp" fuses.
3. If you find a blown fuse, replace it with the correct amperage fuse.

Step 2: Advanced Diagnostics

1. Run a system scan using an Ecutek system or a similar diagnostic tool to read any trouble codes from the BCM (Body Control Module) and IPDM (Intelligent Power Distribution Module).

Step 3: Relay Check

1. Inspect the DTRL relay in the IPDM fuse box next to the battery. If unsure, consider replacing the relay as a process of elimination.

Step 4: Brake Light Switch and Tail Light Wiring

1. If your brake lights don't engage when pressing the brake, despite the headlights functioning, inspect the brake light switch and wiring.
2. Swap the brake light switch with a known working one if possible.
3. Check for any shorts in the tail light wiring and ensure the ground connections are secure.

Step 5: Headlight and Parking Light Wires

1. If the e-brake fuse is popping, inspect the headlight and parking light wires for damage.

Step 6: Electrical Harness and Connections

1. Examine the electrical harness junction and connections for any damage.
2. Use a voltmeter to ensure there is power at all connecting points, particularly at the tail lights on the body side.

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Step 7: Final Checks

1. Once all repairs and checks are complete, test all functions, including the brake lights, tail lights, and dash lighting.
2. It is also advisable to upgrade to fuses with LEDs that light up when blown for easier troubleshooting in the future.

Helpful Tips

• Be systematic in your approach, working from the simplest solution to more complex ones.
• If your 370z has aftermarket parts or wiring, consider that they might be the source of the issue.

When to Seek Professional Help

If you've conducted all the steps above without success, it may be time to seek professional assistance.

A professional mechanic will have the tools and expertise to diagnose and repair complex electrical issues safely.

Remember, working with vehicle electronics can be tricky and, if done incorrectly, may lead to further issues. Always prioritize safety and consult with a professional if you are unsure about any step.

Rekated Articles

• For tips on maintaining your Nissan 370z, check our post on "Nissan 370z Years to Avoid".
• Understanding your vehicle's basics can prevent future issues; learn more about your 370z's "Engine Swap Compatibility" here.
• Discover potential causes and fixes for when your "Nissan 370z Won't Start" in our detailed guide here.

Nick Marchenko, PhD

Industrial Engineer & Automotive Content Specialist

Nick writes in-depth guides on car clubs, engine specs, vehicle ownership, and modifications, combining engineering knowledge with automotive passion.

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