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40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo connector layout
Разъем 40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo
p/n A 211 820 97 89, A 211 870 11 89

The W211 Audio 20 pinouts follows NTG2 pinouts, not NTG1 as this page tells. Only difference to the original NTG 2 is lack of the antenna power wire. Obviously antenna power is arannged otherwise.

Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

BATT+ Battery+  (12V direct from Battery). 
GND, GROUND, KL.31 Chassis Ground
ACC+ Ignition powered. +12 V with the ignition key is in the ACC or ON position.
LAMP Light-on signal or backlight adjustment. +12V supplied to light-on pin of head unit when tail lights ar turned on.

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

strikeout speaker This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GALA This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.

 

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