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Alpine MF2199
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Head unit pinout abbreviations

Pin
Notation
Pin function

Power pins

BATT+ Battery+  (12V direct from Battery). 
GND, GROUND, KL.31 Chassis Ground
IGN 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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Mercedes-Benz Audio 10 CD (1999-2002) Head Unit visual pinout:
Mercedes-Benz Audio 10 CD (1999-2002) Head Unit  diagram
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