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AP2 Chassis Codes: AP2 | Model Years: 2004, 2005, 2006, 2007, 2008, and 2009
This page provides the complete 2004–2009 Honda S2000 radio wiring diagram for the AP2 chassis. Use this guide when replacing the factory head unit or troubleshooting audio issues in a 2004, 2005, 2006, 2007, 2008, or 2009 Honda S2000.
The 2004 model year refresh brought the AP2 chassis update, including a larger-displacement F22C1 2.2L engine and revised exterior styling. The factory audio layout carried over the same two-speaker, door-mounted configuration as the AP1, with no rear speakers or factory amplifier on any trim. The CR (Club Racer) trim introduced for 2008 deleted the factory stereo and speakers entirely as a weight-saving measure — if you have a CR model, no factory wiring will be present and a full aftermarket installation is required.
🔗 In This Guide
2004–2009 Honda S2000 Stereo Wiring Diagram
Use the wiring table below for your 2004, 2005, 2006, 2007, 2008, and 2009 Honda S2000 stereo wire color codes, speaker wiring, and harness pinout.
| Wire Function | Wire Color & Location |
|---|---|
| Battery Constant Power Wire (12V+) | White/Blue |
| Accessory Switched Power Wire (12V+) | White/Red |
| Ground Wire | Black |
 (Simple Radio Install, Keep Steering Wheel Controls and Use Factory Amplifier) |
|
| Illumination Wire | Red/Black |
| Dimmer Wire | Red |
| Antenna Trigger Wire | Yellow/Green |
| 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 (+) | Green/Yellow |
| Front Left Speaker Negative (–) | Gray/Red |
| Front Right Speaker Positive (+) | Green/Black |
| Front Right Speaker Negative (–) | Gray/Red |
| 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 (+) | Blue/Yellow |
| Rear Left Speaker Negative (–) | Gray/Red |
| Rear Right Speaker Positive (+) | Red/Yellow |
| Rear Right Speaker Negative (–) | Brown/White |
| Subwoofer Positive Wire (+) | N/A |
| Subwoofer Negative Wire (–) | N/A |
2004–2009 Honda S2000 Speaker Sizes and Locations
Use the speaker table below for your 2004, 2005, 2006, 2007, 2008, and 2009 Honda S2000 speaker sizes and locations.
| Speakers | Speaker Size & Location |
|---|---|
| Front Tweeter Speaker Size | 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 | 3″ Speakers |
| Rear Speaker Location | Rear Headrest |
| Subwoofer Speaker Size | N/A |
| Subwoofer Speaker Location | N/A |
Frequently Asked Questions
What changed in the AP2 S2000 audio system compared to the AP1?
The AP2 S2000 (2004–2009) carried over the same basic audio architecture as the AP1 — a single-DIN head unit, two front door speakers, and no factory amplifier or rear speakers. The primary differences between AP1 and AP2 are the engine (F22C1 2.2L vs. F20C 2.0L) and exterior styling updates, not audio electronics. The radio connector and harness adapter requirements are the same between AP1 and AP2.
Does the 2004–2009 Honda S2000 CR have a factory radio?
The 2008–2009 S2000 CR (Club Racer) trim was produced as a track-focused package and deleted the factory radio, air conditioning, and some other comfort features to reduce weight. If your S2000 is a CR model, no factory audio wiring is present. Installing audio in an S2000 CR requires running all audio wiring from scratch, starting with power, ground, and speaker wire routed from the fuse box to the head unit and door speakers.
What wiring harness adapter fits a 2004–2009 Honda S2000 AP2?
The AP2 S2000 uses the same Honda 10-pin and 6-pin radio connector as the AP1. Metra 70-1729 is the correct adapter for this application. The same harness adapter fits both AP1 and AP2 models, simplifying parts sourcing for owners doing a radio swap across either chassis version.
How do I reduce wind noise interference in my 2004–2009 Honda S2000’s audio?
Wind noise is a significant challenge in the AP2 S2000 convertible, particularly at highway speeds with the top down. Effective approaches include installing higher-sensitivity door speakers that reproduce clearly at higher volume levels to compete with wind noise, using a digital sound processor (DSP) with equalization tuned to compensate for the acoustic environment, and adding a small power amplifier to drive the door speakers with more headroom. Acoustic wind stoppers and weather sealing on the soft top can also reduce airflow noise before it enters the cabin.
What is the best head unit upgrade for a 2004–2009 Honda S2000?
The AP2 S2000’s single-DIN radio opening accommodates any standard single-DIN aftermarket head unit. Many S2000 owners prefer a compact single-DIN unit with a detachable face to reduce the risk of theft given the convertible’s soft top. Options with Bluetooth streaming, USB input, and a high-voltage preamp output (4V or greater) give the best foundation for adding an amplifier and upgraded door speakers to the S2000’s two-speaker system.
Add Wiring Information
If you have verified 2004–2009 Honda S2000 radio wiring data — wire colors, pin locations, harness adapter tips, or speaker sizes — please share it in the comments below. Community-submitted data is reviewed and added to the table above to help other S2000 owners. If you have a question about your Honda S2000 stereo installation, post it below and our community will work to find an answer.
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