Head unit pinout abbreviations meaning
| Pin Notation | Pin function | 
|---|---|
| Power pins | |
| Bup | Battery+ (12V direct from Battery). | 
| GND, GROUND | Chassis Ground | 
| ACC | Ignition powered. +12 V with the ignition key is in the ACC or ON position. | 
| Lum | Backlight adjustment | 
| 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- | The corresponding speaker ground | 




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