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40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo connector layout
40 (16+12+12) pin QuadLock Fakra Head Unit / Car Stereo connector

Car stereo pinout for BMW models after 2004, the radio module E60/E61 M-ASK and CCC

pin connector A connector B connector C
1 Speaker FR+ mic+ fan+
2 Speaker RR+ gnd aux L
3 Speaker RL+ R zbl+
4 Speaker FL+ G/CVBS zbr+
5 Speaker FR- B fan-
6 Speaker RR- mic- tel+
7 Speaker RL- - aux R
8 Speaker FL- - aux gnd
9 CAN L - zbr-
10 tel mute - zbl-
11 CAN H - diag
12 masa dfahl tel-
13 radio on x x
14 backlight x x
15 +12V x x
16 - x x

Head unit pinout for BMW models after 2000 

pin connector A connector B connector C
1 Speaker FR+ line out L tape in L+
2 Speaker RR+ cd-changer line in gnd tape in L-
3 Speaker RL+ line out GND AUX L
4 Speaker FL+ vcr line in R+ AUX R
5 Speaker FR- vcr line in L+ navi/tv in +
6 Speaker RR- vcr line in gnd telefon +
7 Speaker RL- line out R tape in R+
8 Speaker FL- cd changer line in L+ tape in R-
9 I-BUS cd changer line in R+ navi bus
10 tel mute tv line in R+ AUX GND
11 tel in tv line in L+ navi/tv in -
12 gnd tv line in gnd telefon -
13 amplifier remote x x
14 backlight x x
15 +12V x x
16 +12V ACC x x


Head unit pinout abbreviations meaning

Pin function

Power pins

B+ Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
ACC Ignition powered. +12 V with the ignition key is in the ACC or ON position.
ILL Backlight adjustment
+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- The corresponding speaker ground

Misc. pins

T-M This pin is used to silence the audio, earthed by some other external components that is connected to the radio.
GALA,GAL, GA, SCV This pin is used in some radio equipment to automatically boost up the volume. It needs the output from the speed sensor.
Amp Amplifier control
CDC CD-changer audio

Top right white space on newer cars has duplex optical connection to CAN-BUS 

According to 5 reports in our database (3 positive and 0 negative) the BMW Quadlock connector pinout should be correct.

Is this pinout
BMW Quadlock connector visual pinout:click to enlarge
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