Wiring Diagram AUDI TT 2004 - Bulb monitoring device - dipped beam headlights
| D | Ignition/starter switch |
| E1 | Lighting switch |
| J123 | Bulb monitoring device |
| M29 | Dipped beam bulb, left |
| M31 | Dipped beam bulb, right |
| S5 | Fuse in fuse box |
| S20 | Fuse in fuse box |
| S21 | Fuse in fuse box |
| T10ac | 10-pin connector, on headlight, left |
| T10ad | 10-pin connector, on headlight, right |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A51 | Connection (56), in dash panel wiring harness |
| A103 | Connection -2- (56), in dash panel wiring harness |
| B135 | Connection (15a), in interior wiring harness |
Wiring Diagram AUDI TT 2004 - Bulb monitoring device - tail lights - brake lights
| C10 | Suppression filter |
| E1 | Lighting switch |
| F | Brake light switch |
| J123 | Bulb monitoring device |
| M2 | Tail light bulb, right |
| M4 | Tail light bulb, left |
| M9 | Brake light bulb, left |
| M10 | Brake light bulb, right |
| M25 | High level brake light bulb |
| S22 | Fuse in fuse box |
| S223 | Fuse 23 in fuse box |
| 98 | Earth connection, in tailgate/boot lid wiring harness |
| 238 | Earth connection -1-, in interior wiring harness, near luggage compartment light |
| A84 | Connection (58L), in dash panel wiring harness |
| A85 | Connection (58R), in dash panel wiring harness |
| B131 | Connection (54), in interior wiring harness |
| B139 | Connection (PL (parking light, left)), in interior wiring harness |
| B140 | Connection (PR (parking light, right)), in interior wiring harness |
| B185 | Connection -2- (54), in interior wiring harness |
Wiring Diagram AUDI TT 2004 - On-board computer with auto-check system - function selection switch - reset button
| E91 | Function selection switch |
| E92 | Reset button |
| J123 | Bulb monitoring device |
| J189 | Auto-check system |
| J401 | Navigation system with CD drive control unit |
| K4 | Side light warning lamp |
| R | Radio |
| T6k | 6-pin connector, green, radio connector I-2 |
| T6ap | 6-pin connector, connector C I, on navigation control unit |
| T32b | 32-pin connector, grey, on dash panel insert |
| 42 | Earth point, steering column |
| 279 | Earth connection -5-, in interior wiring harness, behind dash panel |
| A148 | Connection (navigation CAN bus, high), in dash panel wiring harness |
| A149 | Connection (navigation CAN bus, low), in dash panel wiring harness |
| • | CAN bus (data wire) |
| * | Applies to Highline dash panel insert only |
Wiring Diagram AUDI TT 2004 - Dash panel insert - windscreen washer fluid warning contact - ambient temperature sensor
| C | Alternator |
| E87 | Control and display unit for air conditioner |
| F77 | Windscreen washer fluid warning contact |
| G17 | Ambient temperature sensor |
| G106 | Ambient temperature indicator |
| J189 | Auto-check system |
| J285 | Control unit with display in dash panel insert |
| K2 | Alternator warning lamp |
| T12a | 12-pin connector, behind dash panel, right |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| T32b | 32-pin connector, grey, on dash panel insert |
| 112 | Earth connection -2-, in air conditioner wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| * | Models without air conditioner |
| ** | Models with air conditioner |
| *** | Applies to Highline dash panel insert only |
| # | Sender earth output |
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