| Pin | Function | Details |
|---|---|---|
| 1 | R+ | Right Audio Input Positive |
| 2 | L+ | Left Audio Input Positive |
| 3 | SGND | Signal Ground |
| 4 | Mute | Logical 1 when Radio Switch is On |
| 5 | BU+B | Battery +12V |
| 6 | R- | Right Audio Input Negative |
| 7 | L- | Left Audio Input Negative |
| 8 | GND | Ground |
| 9 | TX- | Transmission- |
| 10 | TX+ | Transmission+ |
| 12 | ACC+B | +12V when key is in ACC/AUX position |
May be used to connect CD, MP3, AUX player.

