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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

Multi-pin connector A, 8-pin, for loudspeaker outputs

Pin Function
1 Rear right loudspeaker, positive
2 Front right loudspeaker, positive
3 Front left loudspeaker, positive
4 Rear left loudspeaker, positive
5 Rear right loudspeaker, negative
6 Front right loudspeaker, negative
7 Front left loudspeaker, negative
8 Rear left loudspeaker, negative

Multi-pin connector A, 8-pin, for voltage supply lines and CAN bus

Pin Function
9 CAN bus, high
10 CAN bus, low
11 Telephone mute switch
12 Voltage supply, negative, terminal 31
15 Voltage supply, positive, terminal 30
16 Anti-theft coding control signal, SAFE, positive

Multi-pin connector B, 12-pin, for CD changer control and CD audio input signals

Pin Function
1 Right headphone signal output, positive
2 CD changer, left and right port, negative
3 Headphone signal output, audio ground
4 CD changer, voltage supply, positive, terminal 30, contact continuous load greater than 1 A, temporary peak load 5 A
5 Left headphone signal output, positive
6 CD changer, DATA OUT
8 CD changer, left audio channel, CD/L
9 CD changer, right audio channel, CD/R
10 CD changer, control line, switched positive
11 CD changer, DATA IN
12 CD changer, CLOCK (internal check protocol for data flow monitoring)


Multi-pin connector C, 12-pin, for telephone and microphone signals

Pin Function
6 Telephone audio input signal, negative
12 Telephone audio input signal, positive

 

Meaning of Head Unit pinout signals

Pin
Notation
Pin function

Power pins

+UB Battery+  (12V direct from Battery). 
GND, GROUND Chassis Ground
S-kont Ignition powered. +12 V with the ignition key is in the ACC or ON position.

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-, SGND The corresponding speaker ground

Misc. pins

Amp, ATX+, ATX- Amplifier control
DATA, CLK Head unit communication
Alm

anti-theft alarm system

SWC Steering wheel buttons control
CAN-L, CAN-H CAN on board diagnostic bus
According to 1 reports in our database (1 positive and 0 negative) the Volkswagen RCD 300, RCD 500 Head Unit pinout should be correct.

Is this pinout
Volkswagen RCD 300, RCD 500 Head Unit visual pinout:click to enlarge
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