Meaning of Head Unit pinout signals
| Pin Notation | Pin function | 
|---|---|
| Power pins | |
| Bup+ | Battery+ (12V direct from Battery). | 
| GND, GROUND | Chassis Ground | 
| S-kon | Ignition powered. +12 V with the ignition key is in the ACC or ON position. | 
| LUM | 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. | 
| ANT+ | Power for Electric Antenna. Output +12 V (maximum 150 - 300mA) | 
| 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 | 




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