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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
Part A 
Pin 1: Right Rear audio + 
Pin 2: audio Right front + 
Pin 3: audio Left front + 
Pin 4: Left Rear audio + 
Pin 5: Right Rear audio - 
Pin 6: Right front audio - 
Pin 7: audio front Left - 
Pin 8: audio Rear Left - 
Pin 9: Not used 
Pin 10: data CAN High 
Pin 11: +12 v switched remote - the signal output to activate external devices (amp) 
Pin 12: battery +12 volt powered radio 
Pin 13: CAN data low 
Pin 14: external mute - input signal to mute the music, such as the handsfree 
Pin 15: Not used 
Pin 16: ground - "mass" of the unit, 

Part B 
Pin 1: audio right AUX 2 
Pin 2: audio ground AUX 2 
Pin 3: Not used 
Pin 4: audio right AUX 1 - right channel AUX input 
Pin 5: Not used 
Pin 6: Not used 
Pin 7: audio left AUX 2 
Pin 8: Not used 
Pin 9: Not used (microphone) 
Pin 10: audio left AUX 1 - left channel AUX input 
Pin 11: audio ground AUX 1 - "earth" AUX input 
Pin 12: Not used 

Part C 
Pin 1: ground CDC (cd-Changer) 
Pin 2: data CAN low CDC 
Pin 3: + battery CDC 
Pin 4: Right audio CDC 
Pin 5: Not used 
Pin 6: Not used 
Pin 7: CAN data High 
Pin 8: audio ground CDC 
Pin 9: Not used 
Pin 10: audio left CDC 
Pin 11: Not used 
Pin 12: not used 

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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