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2005–2010 Chassis Code: ANT10 (1st Generation) | Model Years: 2005, 2006, 2007, 2008, 2009, and 2010
This page provides the complete 2005–2010 Scion tC radio wiring diagram for the first-generation ANT10 chassis. Use this guide when installing an aftermarket head unit or troubleshooting your factory stereo in a 2005, 2006, 2007, 2008, 2009, or 2010 Scion tC.
The first-generation tC launched for the 2005 model year as Scion’s sporty coupe, built on a platform shared with the Toyota Avensis/Corolla lineage sold overseas. The tC came standard with a Pioneer-branded head unit, and a Pioneer premium audio upgrade with a trunk-mounted subwoofer and amplifier was offered as a dealer/port-installed accessory on many trims. The core radio wiring architecture remained largely consistent across the 2005–2010 run, though minor head unit and connector revisions occurred with running changes, so it is worth confirming your exact model year before purchasing aftermarket installation components. The first-generation tC was replaced by the redesigned second-generation model for 2011.
🔗 In This Guide
2005–2010 Scion tC Stereo Wiring Diagram
Use the wiring table below for your 2005, 2006, 2007, 2008, 2009, and 2010 Scion tC stereo wire color codes, speaker wiring, and harness pinout.
| Wire Function | Wire Color & Location |
|---|---|
| Battery Constant Power Wire (12V+) | Blue/Yellow |
| Accessory Switched Power Wire (12V+) | Gray |
| Ground Wire | White/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 Wire (+) | N/A |
| Rear View Camera Video Negative Wire (–) | N/A |
| Center Speaker Positive Wire (+) | N/A |
| Center Speaker Negative Wire (–) | N/A |
| Front Left Tweeter Positive Wire (+) | Pink |
| Front Left Tweeter Negative Wire (–) | Purple |
| Front Right Tweeter Positive Wire (+) | Light Green |
| Front Right Tweeter Negative Wire (–) | Blue |
| Front Left Speaker Positive Wire (+) | Pink |
| Front Left Speaker Negative Wire (–) | Purple |
| Front Right Speaker Positive Wire (+) | Light Green |
| Front Right Speaker Negative Wire (–) | Blue |
| Rear Left Tweeter Positive Wire (+) | N/A |
| Rear Left Tweeter Negative Wire (–) | N/A |
| Rear Right Tweeter Positive Wire (+) | N/A |
| Rear Right Tweeter Negative Wire (–) | N/A |
| Rear Left Speaker Positive Wire (+) | Brown |
| Rear Left Speaker Negative Wire (–) | Yellow |
| Rear Right Speaker Positive Wire (+) | Red |
| Rear Right Speaker Negative Wire (–) | White |
| Subwoofer Positive Wire (+) | N/A |
| Subwoofer Negative Wire (–) | N/A |
2005–2010 Scion tC Speaker Sizes and Locations
Use the speaker table below for your 2005, 2006, 2007, 2008, 2009, and 2010 Scion tC speaker sizes and locations.
| Speakers | Speaker Size & Location |
|---|---|
| Center Speaker Size | N/A |
| Center Speaker Location | N/A |
| 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 | 6-1/2″ Speakers |
| Rear Speaker Location | Reart Quarter Panels |
| Subwoofer Speaker Size | N/A |
| Subwoofer Speaker Location | N/A |
Frequently Asked Questions
What harness adapter fits a 2005–2010 Scion tC?
Most 2005–2010 Scion tC models use a Toyota-style factory head unit connector, and a Metra 70-1761 Wire Harness Adapter
or equivalent Toyota/Scion harness adapter is the commonly used plug-and-play solution for connecting an aftermarket radio without cutting factory wiring. Always verify fitment against your specific head unit part number, since a running mid-cycle head unit revision means not every 70-1761-compatible harness is a guaranteed match for every tC built across the run.
Does the 2005–2010 Scion tC have a factory amplifier?
Base tC models with the standard Pioneer head unit typically do not include a separate factory Amplifier. However, tCs equipped with the optional Pioneer premium audio package add a trunk-mounted powered subwoofer enclosure with its own integrated amplifier. When replacing the head unit on a premium-audio car, the factory subwoofer amp is usually retained and driven from the new head unit’s speaker-level or RCA outputs rather than being bypassed entirely, so identify whether your car has this option before assuming a simple 4-speaker swap.
Are there steering wheel audio controls to retain on a 2005–2010 Scion tC?
Steering wheel audio controls were offered on the first-generation tC, so many owners need an SWC retention interface when installing an Aftermarket Head Unit. Because Scion’s steering wheel control wiring uses a resistor-ladder signal rather than discrete wires for each button, a dedicated SWC interface module (matched to your aftermarket radio brand) is required to translate these signals correctly — simply splicing wires will not restore working steering wheel controls.
What dash kit is needed for a 2005–2010 Scion tC head unit swap?
The first-generation tC uses a double-DIN-friendly dash opening on most trims, but the factory bezel and climate control surround require a dedicated Dash Kit (such as a Metra 99-8225 or equivalent) to properly integrate an aftermarket single-DIN or double-DIN Radio without a gap around the factory trim. Confirm whether your tC has the factory navigation/premium display option, since nav-equipped cars may have a different console layout than base audio trims.
Will an aftermarket radio affect the factory subwoofer in a premium-audio 2005–2010 tC?
On tCs with the factory Pioneer premium audio Subwoofer, disconnecting the factory head unit without addressing the sub’s amplifier input can leave the subwoofer silent even though the front and rear door speakers work normally through the new radio. In most installs, the Subwoofer amplifier’s factory input is tapped from the rear speaker output wires at the harness, so identifying and preserving that connection (rather than treating it as unused wiring) is necessary to keep the subwoofer functioning after the swap.
Add Wiring Information
If you have verified 2005–2010 Scion tC 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 tC owners. If you have a question about your Scion tC stereo installation, post it below and our community will work to find an answer.
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