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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 VW audio unit

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
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 Left input AUX signals
2 AUX signal ground
3 CD changer, audio signal ground
4 CD changer, voltage supply, positive, terminal 30, contact continuous power handling greater than 1A, short-term peak power handling 5A
6 CD changer, DATA OUT (data exchange for CD changer control from radio navigation system to CD changer)
7 Right input AUX signals
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 (data exchange for CD changer control from CD changer to radio navigation system)
12 CD changer, CLOCK (internal check protocol for data flow monitoring)

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

Pin Function
1 Microphone input, negative
4 Microphone output, minus
5 Left telephone audio input signal, negative
6 Right telephone audio input signal, negative
7 Microphone input, positive
9 Microphone output, positive
10 Telephone mute (radio mute)
11 Left telephone audio input signal, positive
12 Right telephone audio input signal, positive

26-pin Connector

Pin Function
4 Screening, earth
5 Video output LF right
6 Video output earth
7 Video output sync
8 Video output green
9 Screening, earth
10 Video input LF right
11 Video signal input, shielding mass
12 Video signal input, synchronization vertical and horizontal
13 Video signal input, green
17 Video output LF earth
18 Video output LF left
19 Video output RGBS (-)
20 Video output blue
21 Video output red
22 Video input LF (-)
23 Video input LF left
24 Video signals input, RGBS, negative
25 Video signal input, blue
26 Video signal input, red
26 pin Volkswagen Head Unit Video connector layout
26 pin Volkswagen Head Unit Video connector
at the head unit
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