Pinouts >  Genuine Mercedes-Benz, Smart Car audio harness  >  Mercedes-Benz pinouts
This pinout is associated with 9 compatible devices or models. Show them>

Pin
Notation
Pin function

Power pins

BAT terminal 30 Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
ACC terminal 15 Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL, LAMP, Lume, iLLUM, 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.
ANT+, P.ANT, 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

MUTE, Mut, mu, TEL, TEL MUTE, strikeout speaker This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GALA,GAL, GA, SCV, SDV This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
CAN-L, CAN-H CAN on board diagnostic bus
MOST

The MOST BUS is the communication BUS for entertainment modules in Mercedes-Benz vehicles. When the MOST BUS ring fails or a module doesn’t relay the message, the other modules can fail to function correctly.

 

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Mercedes-Benz Comand APS NTG4.5 Radio Navigation Head Unit visual pinout:
Mercedes-Benz Comand APS NTG4.5 Radio Navigation Head Unit diagram
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