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36 (20+8+8) pin Head Unit / Car Stereo ISO connector layout
36 (20+8+8) pin Head Unit / Car Stereo ISO connector
p/n XM21-18K931-AA

Head unit pinout abbreviations meaning

Pin
Notation
Pin function

Power pins

Ub+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
S-kont Ignition powered. +12 V with the ignition key is in the ACC or ON position.
lightbulb image Backlight adjustment

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
LINE OUT, LINE-OUT LF, LINE-OUT RF, LIN, LIN-R, LIN-L Audio line out

Misc. pins

TEL MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
CAN-L, CAN-H CAN on board diagnostic bus
K-BUS K-line on board diagnostic bus
CD-IN L+, CD-IN L-, CD-IN R+, CD-IN R- CD-changer audio
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