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1st Gen Chassis Codes: GD3 • GD4 | Model Years: 2007 and 2008
This page contains the complete 2007–2008 Honda Fit radio wiring diagram for the 1st generation Fit sold in North America (chassis codes GD3 and GD4). Use this guide when installing an aftermarket head unit or troubleshooting your factory stereo in a 2007 or 2008 Honda Fit.
The Honda Fit arrived in the North American market for the 2007 model year, though it had been sold globally as the Jazz since 2001. The GD3 and GD4 chassis codes cover the front-wheel drive and all-wheel drive configurations respectively. The factory audio system used a straightforward Honda radio harness with front door speakers and rear door speakers. No factory amplifier was present on any trim, making aftermarket head unit installation relatively simple.
🔗 In This Guide
2007–2008 Honda Fit Stereo Wiring Diagram
Use the wiring table below for your 2007 and 2008 Honda Fit stereo wire color codes, speaker wiring, and harness pinout.
| Wire Function | Wire Color & Location |
|---|---|
| Battery Constant Power Wire (12V+) | White/Yellow |
| Accessory Switched Power Wire (12V+) | White/Red |
| Ground Wire | Black |
| Illumination Wire | Red/Black |
| Dimmer Wire | Red |
| Antenna Trigger Wire | N/A |
| Amplifier Trigger Wire | N/A |
| Factory Amplifier Location | N/A |
| Rear View Camera Video Positive (+) | N/A |
| Rear View Camera Video Negative (–) | N/A |
| Dash Center Speaker Positive Wire (+) | N/A |
| Dash Center Speaker Negative Wire (–) | N/A |
| Front Left Tweeter Positive (+) | N/A |
| Front Left Tweeter Negative (–) | N/A |
| Front Right Tweeter Positive (+) | N/A |
| Front Right Tweeter Negative (–) | N/A |
| Front Left Speaker Positive (+) | White |
| Front Left Speaker Negative (–) | Orange |
| Front Right Speaker Positive (+) | Yellow |
| Front Right Speaker Negative (–) | Brown |
| Rear Left Tweeter Positive (+) | N/A |
| Rear Left Tweeter Negative (–) | N/A |
| Rear Right Tweeter Positive (+) | N/A |
| Rear Right Tweeter Negative (–) | N/A |
| Rear Left Speaker Positive (+) | Red |
| Rear Left Speaker Negative (–) | Green |
| Rear Right Speaker Positive (+) | Blue |
| Rear Right Speaker Negative (–) | Black |
| Subwoofer Positive Wire (+) | N/A |
| Subwoofer Negative Wire (–) | N/A |
2007–2008 Honda Fit Speaker Sizes and Locations
Use the speaker table below for your 2007 and 2008 Honda Fit speaker sizes and locations.
| Speakers | Speaker Size & Location |
|---|---|
| Front Tweeter Speaker Size (Trim: Sport) | 1″ Tweeters |
| Front Tweeter Speaker Location | Front Doors |
| Front Speaker Size | 6 1/2″ Speakers |
| Front Speaker Location | Front Doors |
| Rear Tweeter Speaker Size | N/A |
| Rear Tweeter Speaker Location | N/A |
| Rear Speaker Size | 6 1/2″ Speakers |
| Rear Speaker Location | Rear Doors |
| Subwoofer Speaker Size | N/A |
| Subwoofer Speaker Location | N/A |
Frequently Asked Questions
What wiring harness adapter fits a 2007–2008 Honda Fit?
The 1st generation North American Fit (GD3/GD4) uses a Honda radio connector compatible with the Metra 70-1729 harness adapter. This connector is the same as several other Honda models sold in this era. The adapter allows a clean installation without cutting the factory wiring, which is especially important on a vehicle where the original harness may be the only reference for any future repairs.
Does the 2007–2008 Honda Fit have a factory amplifier?
No. The 1st generation Fit sold in North America did not include a factory amplifier on any trim. The head unit drives all speakers directly through a passive circuit. This makes aftermarket head unit installation particularly clean on the Fit — no amplifier bypass, no extra adapters, just the standard harness connection and antenna.
What size are the front door speakers in a 2007–2008 Honda Fit?
The 1st generation North American Fit uses 6 1/2″ Speakers in the front door panels. Rear door speakers are also present on Sport trim models. The Fit’s door panels are thin compared to larger vehicles, so speaker mounting depth is a consideration — select aftermarket speakers with a shallow mount depth (under 2.5 inches) to avoid contact with the window regulator hardware behind the door panel.
Is the 2007–2008 Honda Fit radio opening single-DIN or double-DIN?
The 1st generation Fit has a single-DIN radio opening. A double-DIN head unit cannot be installed without custom dashboard modification or a dedicated double-DIN conversion kit. Single-DIN units (with or without a detachable face or flip-out screen) install directly into the factory opening with a compatible dash kit surround.
How do I add Bluetooth to a 2007–2008 Honda Fit without replacing the radio?
If you want to add Bluetooth to a 1st gen Fit without fully replacing the factory head unit, a compact FM transmitter or an aux-in Bluetooth adapter are the simplest options. If the factory radio has an auxiliary input (common on Sport trim), a Bluetooth receiver plugged into the aux input provides wireless audio streaming. Replacing the head unit with a modern unit is the most complete solution and also adds USB connectivity and phone integration.
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