Head unit pinout abbreviations meaning
| Pin Notation  | 
			Pin function | 
|---|---|
			Power pins | 
		|
| BAT | 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. | 
| P.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 | 
There are no Audio IN in MX-339?


