Head unit pinout abbreviations
| Pin Notation |
Pin function |
|---|---|
Power pins |
|
| +B | Battery+ (12V direct from Battery). |
| GND, GROUND | Chassis Ground |
| lightbulb image | Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on. May be used for backlight adjustment in some models. |
Audio pins |
|
| FR+ or RF+ | Front right speaker out |
| FL+ or LF+ | Front left speaker out |
| RR+ | Rear right speaker out |
| LR+ or RL+ | Rear left speaker out |
| FR- or RF-, FL- or LF-, RR-, LR- or RL-, SGND | The corresponding speaker ground |


