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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

Connector A

Pin
Num
Signal
1 Right Rear audio + 
2 Right front audio + 
3 Left front audio + 
4 Left Rear audio + 
5 Right Rear audio - 
6 Right front audio - 
7 Front Left audio - 
8 Rear Left audio - 
10 data CAN High 
11 +12 v switched remote - the signal output to activate external devices (amp) 
12 battery +12 volt power supply in
13 CAN data low
14 external mute - input signal to mute the music, such as the handsfree
16 ground - mass of the unit

Connector B 

Pin
Num
Signal
1 audio right AUX 2 
2 audio ground AUX 2 
4 audio right AUX 1 - right channel AUX input 
7 audio left AUX 2 
9 Not used (microphone) 
10 audio left AUX 1 - left channel AUX input 
11 audio ground AUX 1 - earth AUX input 

 Connector C

Pin
Num
Signal
1 ground CDC (cd-Changer)
2 data CAN low CDC
3 + battery CDC 
4 Right audio CDC
7 CAN data High
8 audio ground CDC
10 audio left CDC 

Omitted pins are Not Connected. 

Fuse (minifuse) 15A

According to 2 reports in our database (2 positive and 0 negative) the Citroen Quadlock RD4 Head Unit connector pinout should be correct.

Is this pinout
Citroen Quadlock RD4 Head Unit connector visual pinout:click to enlarge
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