Audi Workshop Service and Repair Manuals

Pin assignment of MMI Navigation system plus Control unit 1 for information electronics -J794-

1 -	Connection block with four multi-pin connectors

2 -

MOST bus

3 -

Not used

4 -	Multi-pin connector, 4-pin (T4al) to display unit for front information display and operating unit control unit -J685-

5 -	Multi-pin connector, 4-pin (T4ap) to connection for external audio sources -R199-/internet access control unit -J666-

6 -	Multi-pin connector, 20-pin (T20a) to control unit 1 for information electronics -J794-

7 -	GPS connection from GPS aerial -R50-

Note Contacts which are not listed are not used. 1 - Connection block with four multi-pin connectors

A - Multi-pin connector, 8-pin (T8ah) 1 -  NF mute (low frequency) from pre-fitted components for mobile phone installation 2 -  Voltage supply to control unit 1 for information electronics -J794- (T20a) 3 -  Wake-up to control unit 1 for information electronics -J794- (T20a) 4 -  Not used 5 -  Switch-on signal to aerial amplifier for mobile telephone -R86- 6 -  Res MU to control unit 1 for information electronics -J794- (T20a) 7 -  Open circuit diagnostic lead

B - Multi-pin connector, 12-pin (T12x) 24 -  Microphone input (+) from microphone unit in front roof module -R164- (telephone microphone -R38-) 25 -  Microphone input (–) from microphone unit in front roof module -R164- (telephone microphone -R38-)

C - Multi-pin connector, 12-pin (T12k) All pins are connected to the connection for external audio sources -R199-. 29 -  NF in, earth (low frequency) 30 -  NF in, right-side (low frequency) 31 -  USB (+5 V) - not with internet access control unit -J666- 32 -  USB (earth) 33 -  iPod (ACC power) 34 -  Detect - not with internet access control unit -J666- 35 -  NF in, left-side (low frequency) 36 -  NF in, screen earth (low frequency) 37 -  FBAS wire (+) 38 -  FBAS wire (–) 39 -  iPod data 40 -  iPod data The following pins are also connected to the internet access control unit -J666-. 31 -  USB (+5 V) 32 -  USB (earth) 34 -  Detect

D - Multi-pin connector, 8-pin (T8ao) 10 -  Data from control unit 1 for information electronics -J794- (T20a) 11 -  Data to control unit 1 for information electronics -J794- (T20a) 12 -  Terminal 31 13 -  DIAG signal from telephone bracket -R126- 14 -  Res BT from control unit 1 for information electronics -J794- (T20a) 15 -  Terminal 30 16 -  Earth to control unit 1 for information electronics -J794- (T20a)

2 - MOST bus 1 -  Input 2 -  Output

4 - Multi-pin connector, 4-pin (T4al) All pins are connected to the display unit for front information display and operating unit control unit -J685-. 1 -  LVDS (–) 2 -  LIN 3 -  LVDS (+) 4 -  Earth

5 - Multi-pin connector, 4-pin (T4ap) All pins are connected to the connection for external audio sources -R199-/internet access control unit. -J666-. 1 -  D (+) 2 -  iPod detected 3 -  D (–) 4 -  Earth

6 - Multi-pin connector, 20-pin (T20a) 6 -  Wake-up to control unit 1 for information electronics -J794- 7 -  Voltage supply from control unit 1 for information electronics -J794- 8 -  Earth from control unit 1 for information electronics -J794- 13 -  Res MU from control unit 1 for information electronics -J794- 14 -  Res MU to control unit 1 for information electronics -J794- 15 -  Data from control unit 1 for information electronics -J794- 16 -  Data to control unit 1 for information electronics -J794-