Mounting a third brake light on a 2007 Honda Pilot can seem daunting, but understanding the wiring and harness system simplifies the process. This guide will walk you through the key components and potential troubleshooting steps.
Understanding the Wiring Harness
The rear wiring harness and tailgate wiring harness are crucial for the third brake light functionality. The rear harness originates near the trailer tow connection under the “D” pillar on the left side. It powers components like the rear compass module, speakers, accessory plug, rear window heater, and hatch lift. The tailgate harness branches from the rear harness in the roof’s center, connecting to the liftgate through a flexible gaiter. This harness powers the third brake light, license plate lights, rear camera, and various sensors. A functioning license plate and tailgate accessories suggest a properly connected tailgate harness.
Key Connectors and Locations
While individual connectors lack specific designators, two crucial connectors, C601 and C602, link the tailgate and rear harnesses in the car roof, just forward of the third brake light assembly. C601 varies between power and non-power liftgate models (34 pins vs. 16 pins). Accessing these connectors might be possible by removing the rear courtesy light, exercising caution due to its continuous power. The rear window defogger harness connector sits below the third brake light within the tailgate. The exact location of the third brake light connector on the tailgate harness isn’t explicitly shown in diagrams. Accessing the full tailgate harness likely requires removing the interior trim panel. A ground connection in the rear center of the car roof supports tailgate functions, including the third brake light.
Troubleshooting Tips
If the third brake light isn’t working, start by verifying power at the roof connectors. If power is present but the light remains off, the issue likely lies within the tailgate itself, possibly a disconnected or faulty connector. Removing the tailgate’s interior trim will provide access for inspection and testing. The absence of rear impact sensors in these harnesses allows for safe live testing of connections.
Remember, while this guide offers general guidance, consulting a 2007 Honda Pilot service manual is recommended for detailed diagrams and specific instructions. This manual, though officially covering the 2012 model year (the last of the second generation), largely applies to earlier second-generation Pilots.
Conclusion
Mounting or troubleshooting a third brake light on a 2007 Honda Pilot involves understanding the rear and tailgate wiring harnesses, key connectors like C601 and C602, and potential connection points within the tailgate. While accessing these areas might require some disassembly, careful inspection and testing can pinpoint the issue. Always refer to the official service manual for precise guidance and diagrams specific to your vehicle.
