Subaru Head Unit Pinouts
Car's factory radio harness plug:
|
Pin numbers on factory radio harness plug:
|
Socket on factory radio:
|
| Subaru 20-pin Radio Connector (Speaker / Power Wiring) Pin Assignments |
||||
|
Pin |
Function |
Column "A" |
Column "B" |
|
| 2008–2011 Impreza |
2009–2011 Forester |
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| 1 | Illumination + (E) | Orange [ / White] (G) | Violet | Violet |
| 2 | Dimmer (Illumination –) (F) | [Orange / Black] (G) | Black / White | Black / White |
| 3 | +12 Volt Accessory (switched) (H) | Red | Yellow / Red | Yellow / Red |
| 4 | Steering Wheel Controls (SWC1+) (I) | [Brown / Red] (J) | Brown | Lt Green / Red |
| 5 | Left Rear Speaker – | Green / Black | Red / Black | Red / Yellow |
| 6 | Left Rear Speaker + | Green | White / Red | White / Black |
| 7 | Left Front Speaker – | White / Black | White / Black | Brown / White |
| 8 | Left Front Speaker + | White | Blue / Orange | Brown |
| 9 | Antenna Booster Amplifier Power + (K) | Blue [ / White] (L) | Yellow / Black | Yellow / Black |
| 10 | Ground | Black | Black / Blue | Black |
| 11 | Impreza/Forester: CAN Low (data bus) (M) Legacy/Outback: Steering Wheel Controls (SWC2+) (I)(N) |
[Brown / Yellow] (J) | Lt Green / Red | Blue |
| 12 | Impreza/Forester: CAN High (data bus) (M) Legacy/Outback: Body Integrated Unit |
[Brown / Green] (J) | Pink | Pink |
| 13 | Impreza/Forester w/ BT: Steering Wheel Controls (SWC2+) (I)(P) 2012–2013 Legacy/Outback with OEM HU CE617U1: SWC2+ 2010–2012 Legacy/Outback: +12V Ignition (ON/RUN) |
[Brown / Blue] (J) | [Blue / White] (P) | [Red] (P) |
| 14 | Steering Wheel Controls – (common) (I) | [Brown / Black] (J) | Yellow | Yellow |
| 15 | Right Rear Speaker – | Violet / Black | Red / White | Gray / Red |
| 16 | Right Rear Speaker + | Violet | Gray / Green | Gray |
| 17 | Right Front Speaker – | Gray / Black | Green | Blue / Yellow |
| 18 | Right Front Speaker + | Gray | Brown / Yellow | Blue / White |
| 19 | Some models (see footnote): VSS (Q) Legacy/Outback: +12V Battery (different circuit) |
— | — | — |
| 20 | +12 Volt Battery (Memory) (R) | Yellow | Blue / Red |
Blue / Red |
p/n 86431VA640 86431AL63A
| Pin Num |
Signal | Details |
|---|---|---|
| A1 | FR+ | |
| A2 | FL+ | |
| A3 | ACC | 11-15V when ACC ON |
| A4 | B+ | 11-15V constant |
| A5 | FR- | |
| A6 | FL- | |
| A7 | GND | Chassis ground |
| A8 | ANT-ON | |
| A10 | ILL+ | |
| B2 | INT+ | |
| B4 | SLD2 | |
| B5 | ILL- | |
| B6 | INT- |
| Pin Num |
Color | Signal |
|---|---|---|
| 1 | IGN | 11-15V when IGN ON |
| 2 | REVERSE | |
| 3 | BRIGHT | |
| 4 | VCC | |
| 5 | MIC+ | |
| 6 | DET | |
| 7 | AMP CAN+ | amplifier communication |
| 8 | AMP CAN- | amplifier communication |
| 9 | CAN+ | |
| 10 | CAN- | |
| 11 | AC-UART (+) | |
| 12 | AC-UART (-) | |
| 13 | MIC2+ | |
| 14 | MIC2- | |
| 15 | PKB | 1V or less at parking ON |
| 16 | MUTE | |
| 17 | SPEED | pulse signal when tire is rotating |
| 18 | SGND | |
| 19 | MIC- | |
| 20 | TEST | |
| 21 | STEERING SW1+ | |
| 22 | STEERING SW2+ | |
| 23 | STEERING SW GND | |
| 24 | DCM MUTE | |
| 25 | FRONT ON | |
| 26 | R SIG | |
| 27 | R/L SIG | |
| 28 | L SIG |
5 pin connector, numbering from right to left.
| Pin Num |
Signal |
|---|---|
| 1 | GND |
| 2 | 6V+ |
| 3 | CA+ |
| 4 | CA- |
| 5 | N/C |
SWC buttons
| Signal | Resistance | Circuit |
|---|---|---|
| none | approx 100 kΩ | 1 |
| VOL (+) | approx 490 kΩ | 1 |
| VOL (-) | approx 1290 kΩ | 1 |
| SEEK (>) | less than 1 Ω | 1 |
| SEEK (<) | approx 160 Ω | 1 |
| MUTE | approx 2730 Ω | 1 |
| none | approx 100 kΩ | 2 |
| TALK | approx 1290 Ω | 2 |
| SOURCE | less than 1 Ω | 2 |
| ON HOOK | approx 490 kΩ | 2 |
| OFF HOOK | approx 160 kΩ | 2 |
Omitted pins are Not Connected.