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3rd Gen Chassis Codes: GK3 • GK4 • GK5 • GK6 | Model Years: 2015, 2016, 2017, 2018, 2019, and 2020
This page provides the complete 2015–2020 Honda Fit radio wiring diagram for the 3rd generation Fit (chassis codes GK3, GK4, GK5, and GK6). Use this guide when replacing the factory head unit or troubleshooting audio in a 2015, 2016, 2017, 2018, 2019, or 2020 Honda Fit.
The 3rd generation Fit introduced Honda’s Display Audio touchscreen on EX and EX-L trims, which uses a capacitive touchscreen with Apple CarPlay and Android Auto on later model years. LX trims retained a standard single-DIN style head unit. No factory amplifier was used on any trim level. EX-L trims added a backup camera whose video signal is routed through the factory head unit. A harness adapter and steering wheel control retention interface are recommended for all head unit replacements on this generation.
🔗 In This Guide
2015–2020 Honda Fit Stereo Wiring Diagram
Use the wiring table below for your 2015, 2016, 2017, 2018, 2019, and 2020 Honda Fit stereo wire color codes, speaker wiring, and harness pinout.
| Wire Function | Wire Color & Location |
|---|---|
| Battery Constant Power Wire (12V+) | Green |
| Accessory Switched Power Wire (12V+) | Purple |
| Ground Wire | Black |
 (Simple Radio Install, Keep Steering Wheel Controls and Use Factory Amplifier) |
|
| Illumination Wire | N/A |
| Dimmer Wire | N/A |
| 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 (–) | Black |
| Front Right Speaker Positive (+) | Red |
| Front Right Speaker Negative (–) | Green |
| 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 (+) | Purple |
| Rear Left Speaker Negative (–) | Gray |
| Rear Right Speaker Positive (+) | Blue |
| Rear Right Speaker Negative (–) | Pink |
| Subwoofer Positive Wire (+) | N/A |
| Subwoofer Negative Wire (–) | N/A |
2015–2020 Honda Fit Speaker Sizes and Locations
Use the speaker table below for your 2015, 2016, 2017, 2018, 2019, and 2020 Honda Fit speaker sizes and locations.
| Speakers | Speaker Size & Location |
|---|---|
| Front Tweeter Speaker Size | 1″ Tweeters |
| Front Tweeter Speaker Location | Dash Corners |
| 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
Does the 2015–2020 Honda Fit have Apple CarPlay?
The 3rd generation Fit received Apple CarPlay and Android Auto as a software update on some Display Audio-equipped models. 2019 and 2020 model years with the Display Audio system include both CarPlay and Android Auto. Earlier 2015–2018 models with Display Audio do not natively support CarPlay or Android Auto without an aftermarket head unit replacement. LX trim with the non-touch radio does not support either in any model year.
What wiring harness adapter fits a 2015–2020 Honda Fit?
The 3rd generation Fit uses a connector compatible with Metra 70-1729 harness adapter for non-touchscreen LX trims. EX and EX-L trims with the Display Audio touchscreen use a different interface connection for the backup camera and vehicle data. An additional camera bypass interface may be needed to retain the factory backup camera when replacing the Display Audio head unit on those trims.
How do I keep the backup camera working in a 2015–2020 Honda Fit EX-L after replacing the radio?
The backup camera in the 3rd generation Fit EX-L routes its video signal through the factory Display Audio head unit. When replacing the head unit, connect the camera’s video output to the aftermarket radio’s rear camera input and configure the radio to activate the camera input when the reverse gear is selected. A trigger wire (connected to the reverse light circuit) tells the aftermarket radio when to display the camera feed.
Does the 2015–2020 Honda Fit have steering wheel audio controls?
EX and EX-L trims of the 3rd generation Fit include steering wheel audio controls. A CAN-bus compatible SWC retention interface is required to retain these functions after replacing the head unit. The PAC SWI-CP2 or iDatalink ADS-SWC work with this generation’s CAN-bus SWC system. LX trim does not include steering wheel audio controls.
What size are the factory speakers in a 2015–2020 Honda Fit?
The 3rd generation Fit uses 6 1/2″ Speakers in the front door panels across all trims. Rear speaker sizes vary by trim — Sport and EX trims include rear door speakers, while LX may use a smaller rear speaker location. The compact size of the Fit’s doors means speaker mounting depth is a consideration; verify clearance before selecting aftermarket speakers, and favor shallow-mount designs for the rear doors.
Have 2015–2020 Honda Fit Wiring Information?
If you have verified 2015–2020 Honda Fit 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 3rd generation Fit owners.
If you have a question about your 3rd gen Honda Fit stereo installation, post it below and our community will work to find an answer.
Add Wiring Information
If you have verified 2015–2020 Honda Fit 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 3rd generation Fit owners. If you have a question about your 3rd gen Honda Fit stereo installation, post it below and our community will work to find an answer.