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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
p/n 8E0 035 186 AK

Head unit pinout abbreviations meaning

Pin function
+UB +12V constant
TEL MUTE This pin is used to silence the audio, earthed by some other external components that is connected to the radio.

Audio pins

R Right speaker out
L Left speaker out
RF+ Front right speaker out
LF+ Front left speaker out
RR+ Rear right speaker out
RL+ Rear left speaker out
FR-, RF-, FL-, LF-, RR-, LR-, RL- The corresponding speaker ground
LINE RR, LINE FR, LINE RL, LINE FL. LINE GND Audio line out for amplifier
Tel AF+, Tel AF- Hands Free Mic V+, V-
Tel Mute Mute for handsfree
BOSE External amp sence

Misc. pins

CDC-IN L+, CDC-IN L-, CDC-IN R+, CDC-IN R- CD-changer audio
RC-IN, RC-GND, /- RC +12V, FB-IN Remote control

anti-theft alarm system GND


According to 2 reports in our database (1 positive and 0 negative) the Audi (2005-2008) A4 B7 Concert Solo Head Unit pinout should be correct.

Is this pinout
Audi (2005-2008) A4 B7 Concert Solo Head Unit visual pinout:click to enlarge
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