Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Towing Requirements - Trailer Lights and Wiring
Whenever you pull a trailer, regardless of the trailer size, stoplights and turn signals on the trailer are required for motoring safety.
The Trailer Tow Package may include a 7-pin or a 13-pin wiring harness. Use a factory approved trailer harness and connector.
The electrical connections are all complete to the vehicle but you must mate the harness to a trailer connector.
| Pin Number | Function | Wire Color |
|---|---|---|
| 1 | Left Turn Signal | Yellow |
| 2 | Rear Fog Light | Blue |
| 3 | Ground/Common Return | White |
| 4 | Right Turn Signal | Green |
| 5 | Right Rear Position, Side Marker Lights, and Rear Registration Plate Illumination Device.* | Brown |
| 6 | Stoplights | Red |
| 7 | Left Rear Position, Side Marker Lights, and Rear Registration Plate Illumination Device.* | Black |
| * The rear position registration plate illumination device shall be connected such that no light of the device has a common connection with both pins 5 and 7. | ||
| Pin Number | Function | Wire Color |
|---|---|---|
| 1 | Left Turn Signal | Yellow |
| 2 | Rear Fog Light | Blue |
| 31 | Ground/Common Return for Contacts (Pins) 1 and 2 and 4 to 8 | White |
| 4 | Right Turn Signal | Green |
| 5 | Right Rear Position, Side Marker Lights, and Rear Registration Plate Illumination Device.2 | Brown |
| 6 | Stoplights | Red |
| 7 | Left Rear Position, Side Marker Lights, and Rear Registration Plate Illumination Device.2 | Black |
| 8 | Reverse lights | Red/Black |
| 9 | Permanent Power Supply (+12V) | Brown/White |
| 10 | Power Supply Controlled by Ignition Switch (+12V) | Red |
| 111 | Return for Contact (Pin) 10 | White |
| 12 | Reserve for Future Allocation | Red/Blue |
| 131 | Return for Contact (Pin) 9 | White |
| Note: The allocation pin 12 has been changed from "Coding for coupled Trailer" to "Reserve for Future Allocation." | ||
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1 The three return circuits shall not be connected electrically in the trailer. |
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2 The rear position registration plate illumination device shall be connected such that no light of the device has a common connection with both pins 5 and 7. |
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NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.