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Wiring Diagram AUDI A3 2002 - High bus and low bus in dash panel wiring harness
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| J361 | Simos control unit |
| T10 | 10-pin connector, white, in plenum chamber |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| * | Only applies to 5-speed automatic gearbox and engines with engine code AUQ, from November 2001 onwards: applicable for engine code AUM |
| ** | Only applies to 4-speed automatic gearbox and engines with engine codes APG / AUM, as of November 2001 no longer fitted |
| *** | Only applies to 5-speed automatic gearbox and engines with engine codes ATD, ASZ |
| **** | Only applies to 4-speed automatic gearbox and engines with engine codes AVU, BFQ |
Wiring Diagram AUDI A3 2002 - High bus and low bus - convenience CAN bus in dash panel wiring harness
| G85 | Steering angle sender |
| J104 | ABS with EDL control unit |
| J492 | Four-wheel drive control unit |
| R | Radio |
| R36 | Telephone transmitter and receiver unit |
| T8f | 8-pin connector, black, on four-wheel drive control unit |
| T20a | 20-pin connector, black, on radio |
| T46 | 46-pin connector, on telephone/telematics control unit |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| * | Does not apply to models with driver information system and from model year 2002 onwards |
| ** | Does not apply to models with driver information system and from model year 2003 onwards |
Wiring Diagram AUDI A3 2002 - Auto-check system - combi-processor in dash panel insert
| J189 | Auto-check system |
| J218 | Combi-processor in dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| T32b | 32-pin connector, grey, on dash panel insert |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
| A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
| * | Does not apply to models with driver information system and from model year 2002 onwards |
Wiring Diagram AUDI A3 2002 - Infotainment CAN bus - navigation CAN bus in dash panel wiring harness
| J402 | Operating electronics control unit, navigation |
| J415 | Navigation/TV tuner |
| R94 | Navigation interface |
| T12b | 12-pin connector, at navigation interface |
| T26 | 26-pin connector, black, on navigation control unit |
| A148 | Connection (navigation CAN bus, high), in dash panel wiring harness |
| A149 | Connection (navigation CAN bus, low), in dash panel wiring harness |
| A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
| A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
| * | Only applies to models with radio navigation system (RNS-D) |
| ** | Only applies to models with radio navigation system (RNS-D) and TV tuner |
Wiring Diagram AUDI A3 2002 - Infotainment CAN bus in dash panel wiring harness
| J401 | Navigation system with CD drive control unit |
| J453 | Multi-function steering wheel control unit |
| J526 | Telephone/telematics control unit |
| R | Radio |
| R36 | Telephone transmitter and receiver unit |
| T18 | 18-pin connector, on multi-function steering wheel control unit |
| T20a | 20-pin connector, black, on radio |
| T20b | 20-pin connector, black, on navigation control unit |
| T46 | 46-pin connector, on telephone/telematics control unit |
| A178 | Connection (infotainment CAN bus, high), in dash panel wiring harness |
| A179 | Connection (infotainment CAN bus, low), in dash panel wiring harness |
| * | Only applies to models with telephone |