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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
at the car stereo

Quadlock Part A 

Pin Function
1 Right Rear audio + 
2 audio Right front + 
3 audio Left front + 
4 Left Rear audio + 
5 Right Rear audio - 
6 Right front audio - 
7 audio front Left - 
8 audio Rear Left - 
10 data CAN High 
11 +12 v switched remote - the signal output to activate external devices (amp) 
12 battery +12 volt powered radio 
13 CAN data low 
14 external mute - input signal to mute the music, such as the handsfree 
16 Ground
Contacts 1 to 8 - are amplifier output for the speakers 

Quadlock Part B 

Pin Function
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 
other pins are not used

Quadlock Part C

Pin Function
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 
other pins are not used
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Peugeot 207 (2006-2012) RD4 Head Unit visual pinout:click to enlarge
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