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2011–2016 Chassis Code: AGT20 (2nd Generation) | Model Years: 2011, 2012, 2013, 2014, 2015, and 2016
This page provides the complete 2011–2016 Scion tC radio wiring diagram for the second-generation AGT20 chassis. Use this guide when installing an aftermarket head unit or troubleshooting your factory stereo in a 2011, 2012, 2013, 2014, 2015, or 2016 Scion tC.
The redesigned second-generation tC debuted for 2011 on Toyota’s Zelas Coupe platform, with a Pioneer-branded head unit standard and a Pioneer premium audio upgrade (including a trunk-mounted subwoofer) offered as a dealer-installed accessory. A 2014 model-year refresh brought a revised front fascia and, on Release Series and Limited Edition trims, an available touchscreen Pioneer head unit with navigation. Because both a standard non-touchscreen head unit and an optional touchscreen/navigation unit were offered across this generation, the factory connector and available features can differ depending on trim and model year, so confirm your exact configuration before ordering aftermarket installation parts. Scion discontinued the tC — and the Scion brand itself — after the 2016 model year, with remaining inventory folded into Toyota dealerships in 2017.
🔗 In This Guide
2011–2016 Scion tC Stereo Wiring Diagram
Use the wiring table below for your 2011, 2012, 2013, 2014, 2015, and 2016 Scion tC stereo wire color codes, speaker wiring, and harness pinout.
| Wire Function | Wire Color & Location |
|---|---|
| Battery Constant Power Wire (12V+) | Blue |
| Accessory Switched Power Wire (12V+) | Yellow |
| Ground Wire | Brown |
 (Simple Radio Install, Keep Steering Wheel Controls and Use Factory Amplifier) |
|
| Illumination Wire | N/A |
| Dimmer Wire | N/A |
| Antenna Trigger Wire | Red |
| Amplifier Trigger Wire | White |
| 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 (+) | Black |
| 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 |
2011–2016 Scion tC Speaker Sizes and Locations
Use the speaker table below for your 2011, 2012, 2013, 2014, 2015, and 2016 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 Mid-Range Speaker Size | 4″ Speakers |
| Front Mid-Range Speaker Location | Front Doors |
| Front Speaker Size | 6″ x 9″ Speakers |
| Front Speaker Location | Front Doors |
| Rear Tweeter Speaker Size | N/A |
| Rear Tweeter Speaker Location | N/A |
| Rear Speaker Size | 5-1/4″ Speakers |
| Rear Speaker Location | Rear Doors |
| Subwoofer Speaker Size | N/A |
| Subwoofer Speaker Location | N/A |
Frequently Asked Questions
Is the wiring different between the standard head unit and touchscreen navigation tC?
Yes. Base and Release Series tC models built through most of this generation used a standard Pioneer Head Unit with a conventional Toyota-style wiring connector, while the touchscreen Pioneer navigation unit offered on later Release Series and Limited Edition trims (introduced with the 2014 refresh) adds additional wiring for the navigation display, backup camera input, and USB/auxiliary hub that isn’t present on the base system. Confirm whether your tC has the touchscreen navigation option before assuming a base-unit harness adapter will capture every factory wire.
Does the 2011–2016 Scion tC have steering wheel audio controls?
Steering wheel audio controls were standard equipment across the second-generation tC lineup. As with other Toyota/Scion vehicles of this era, these controls communicate over a resistor-ladder signal rather than discrete switch wires, so a dedicated SWC retention interface matched to your Aftermarket Head Unit brand is required to keep steering wheel audio functions working after a radio swap.
What dash kit fits a 2011–2016 Scion tC?
The second-generation tC has a double-DIN factory opening, and a dedicated dash kit (such as a Metra 99-8226 Dash Kit or equivalent) is typically needed to properly trim out an aftermarket single-DIN or double-DIN radio around the factory climate control surround. Because the 2014 refresh updated the center stack trim, confirm whether your Dash Kit is designed for pre-refresh (2011–2013) or post-refresh (2014–2016) trim panels, as they are not always interchangeable.
Does the factory premium audio subwoofer still work after installing an aftermarket radio?
On tC models equipped with the optional Pioneer premium audio package, the trunk-mounted subwoofer’s Amplifier is typically fed from the factory rear speaker output wires rather than a dedicated pre-amp input. When installing an Aftermarket Head Unit, tapping into these same rear speaker leads (instead of ignoring them as spare wiring) is usually necessary to keep the factory Subwoofer producing bass after the swap.
What changed with the 2014 model-year refresh that affects a radio install?
The 2014 refresh introduced a restyled front fascia along with an available touchscreen Pioneer Head Unit on certain Release Series and Limited Edition trims, in addition to the carryover standard non-touchscreen Pioneer unit on base trims. Because two distinct head unit types were sold side-by-side from 2014–2016, verify your specific head unit’s part number and connector style rather than assuming all 2014-and-later tC models share identical wiring.
Add Wiring Information
If you have verified 2011–2016 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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