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46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector layout
46 (8+8+10+20) pin ISO 10487 Head Unit / Car Stereo connector
p/n 4B0035186H, 4B0057186Q, 4B0035186G, 8N0035186B, 4B0035186Q

 A connector (black)

Pin
Number
Description
1 BOSE coding to ground (only with BOSE)
2 Anti-theft warning system ground from Comfort System Central Control Module
3 L-diagnostic
7 Terminal 30
8 Terminal 31

B connector (brown)

Pin
Number
Description
3 Right front speaker (+) (not with BOSE)
4 Right front speaker (-) (not with BOSE)
5 Left front speaker (+) (not with BOSE)
6 Left front speaker (-) (not with BOSE)

C connector (black)

Pin
Number
Description
1 Left rear signal to Amplifier
2 Right rear signal to Amplifier
3 Signal ground to Radio
4 Left front signal to Amplifier (only with BOSE)
5 Right front signal to Amplifier (only with BOSE)
6 Positive switched to Amplifier
7 CAN-Bus High (Infotainment)
10 CD ground to CD Changer
12 CAN-Bus Low (Infotainment)
13 CD data in from CD Changer
14 CD data out to CD Changer
15 CD CLK from CD Changer
16 Permanent positive to CD Changer
17 Positive switched to CD Changer
18 CD ground to CD Changer
19 Left signal from CD Changer
20 Right signal from CD Changer

D connector (red)

Pin
Number
Description
1 NF mute from Telephone Transceiver /preliminary setup for cell phone package
3 NF (+) from Telephone Transceiver (not with Nav IV)/preliminary setup for cell phone package
4 NF (-) from Telephone Transceiver (not with Nav IV)/preliminary setup for cell phone package
5 NF (+) from Navigation System with CD Drive Control Module (only with Nav IV)
6 NF (-) from Navigation System with CD Drive Control Module (only with Nav IV)
7 Navigation control wire from Navigation System with CD Drive Control Module (only with Nav IV)

Pins not mentioned are not connected. 

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Audi (2002-2008) Concert 2 CD RS4, A6 Head Units visual pinout:click to enlarge
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