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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

Pin Function Pin Function
1 Rear Right+ 21 FBAS+ (TRSVC)
2 Front Right+ 22 Mic-
3 Front Left+ 23 FBAS Shield (TRSVC)
4 Rear Left+ 24 FBAS (-) (TRSVC)
5 Rear Right- 25 Mic2 Shield
6 Front Right- 26 FBAS Shield (baseplate)
7 Front Left- 27 FBAS (-) (baseplate)
8 Front Left- 28 FBAS (+) (baseplate)
9 CAN Low 29 ETH_A (OBD 8)
11 CAN High 30 AUX In Left
12 GND 31 ETH_TX+ (OBD 12)
13 Radio ON (CIC) 32 ETH_TX- (OBD 13)
15 +12V Power (20Amp) 33 Mic 1 Shield
17 Mic1+ 35 AUX In Right
18 Mic2+ 36 AUX In GND
19 Mic2- 37 ETH_RX+ (OBD 3)
    38 ETH_RX- (OBD 11)
    39  AUX Shield

Pins not mentioned are not connected.

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BMW (2007-2016) Car Information Computer (CIC) Head Unit visual pinout:click to enlarge
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