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Head unit pinout abbreviations Pin Notation Pin function Power pins BAT+ Battery+ (12V direct from Battery). GND, GROUND Chassis Ground ACC+ Ignition powered. Ni massive 13 activation key. +12 V with the ignition key is in the ACC or ON position. ILL Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on. 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 Misc. Pins TEL This pin is used to silence the audio, earthed by some other external components that is connected to the radio.

SDV This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.

SDA, SCL, MRQ Head unit I2C bus communication (i.e. For on-board display) SWC Steering wheel control buttons.