| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J519 | Onboard supply control unit |
| SA1 | Fuse 1 in fuse holder A |
| SA5 | Fuse 5 in fuse holder A |
| SC27 | Fuse 27 on fuse holder C |
| T2 | 2-pin connector |
| T4t | 4-pin connector, near starter |
| T52c | 52-pin connector |
| 1 | Earth strap, battery - body |
| 14 | Earth point, on gearbox |
| 508 | Threaded connection (30) on E-box |
| 652 | Earth point, engine and gearbox earth |
| B169 | Positive connection 1 (30), in interior wiring harness |
| B177 | Connection (61), in interior wiring harness |
| * | Only models with 90 A/ 110 A alternator |
| *2 | Only models with 140 A alternator |
| *3 | Only models with dual clutch gearbox (DSG) |
| *4 | Up to February 2012 |
| *5 | From February 2012 |
| J329 | Terminal 15 voltage supply relay |
| J519 | Onboard supply control unit |
| J682 | Terminal 50 voltage supply relay |
| SB | Fuse holder B |
| SC2 | Fuse 2 on fuse holder C |
| SB6 | Fuse 6 on fuse holder B |
| SB7 | Fuse 7 on fuse holder B |
| T40 | 40-pin connector |
| T52b | 52-pin connector |
| 508 | Threaded connection (30) on E-box |
| A41 | Positive connection (50), in dash panel wiring harness |
| B163 | Positive connection 1 (15), in interior wiring harness |
| B278 | Positive connection 2 (15a) in main wiring harness |
| B504 | Positive connection 8 (30a), in interior wiring harness |
| * | From January 2010 |
| *2 | Up to January 2010 |
| G | Fuel gauge sender |
| G6 | Fuel system pressurisation pump |
| J17 | Fuel pump relay |
| J519 | Onboard supply control unit |
| J643 | Fuel supply relay |
| SB | Fuse holder B |
| SB24 | Fuse 24 on fuse holder B |
| T5b | 5-pin connector |
| T40 | 40-pin connector |
| T52b | 52-pin connector |
| 383 | Earth connection 18, in main wiring harness |
| 682 | Earth point 2, in rear right side panel |
| A193 | Connection (87a), in dash panel wiring harness |
| B156 | Positive connection (30a), in interior wiring harness |
| B485 | Connection 21, in main wiring harness |
| * | Up to July 2010 |
| *2 | From January 2010 |
| *3 | Up to January 2010 |
| J220 | Motronic control unit, central in plenum chamber |
| J519 | Onboard supply control unit |
| J527 | Steering column electronics control unit |
| T14a | 14-pin connector |
| T16f | 16-pin connector |
| T20d | 20-pin connector |
| T80 | 80-pin connector |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 607 | Earth point, on left in plenum chamber |
| B441 | Connection (CCS), in main wiring harness |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
| D110 | Connection 8 in engine compartment wiring harness |
| * | From August 2010 |
| *2 | Up to July 2010 |
| J220 | Motronic control unit, central in plenum chamber |
| J519 | Onboard supply control unit |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T14a | 14-pin connector |
| T80 | 80-pin connector |
| 15 | Earth point, on cylinder head |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 281 | Earth point 1, engine prewiring harness |
| D206 | Connection 4 (87a) in engine prewiring harness |
| G40 | Hall sender |
| G62 | Coolant temperature sender |
| G186 | Throttle valve drive for electric throttle |
| G187 | Throttle valve drive angle sender 1 for electric throttle |
| G188 | Throttle valve drive angle sender 2 for electric throttle |
| J220 | Motronic control unit, central in plenum chamber |
| J338 | Throttle valve module |
| J519 | Onboard supply control unit |
| T3b | 3-pin connector |
| T6x | 6-pin connector |
| T80 | 80-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D101 | Connection 1 in engine compartment wiring harness |
| G79 | Accelerator position sender |
| G83 | Radiator outlet coolant temperature sender |
| G130 | Lambda probe after catalytic converter |
| G185 | Accelerator position sender 2 |
| J220 | Motronic control unit, central in plenum chamber |
| J519 | Onboard supply control unit |
| T4v | 4-pin connector, near catalytic converter |
| T6h | 6-pin connector |
| T80 | 80-pin connector |
| Z29 | Lambda probe 1 heater after catalytic converter |
| D108 | Connection 6 in engine compartment wiring harness |
| D109 | Connection 7 in engine compartment wiring harness |
| D130 | Connection 28 in engine compartment wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| F | Brake light switch |
| G39 | Lambda probe |
| J220 | Motronic control unit, central in plenum chamber |
| J519 | Onboard supply control unit |
| T4bc | 4-pin connector |
| T4bg | 4-pin connector |
| T52c | 52-pin connector |
| T80 | 80-pin connector |
| Z19 | Lambda probe heater |
| 389 | Earth connection 24, in main wiring harness |
| B131 | Connection (54), in interior wiring harness |
| B350 | Positive connection 1 (87a) in main wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| * | Up to February 2012 |
| *2 | Only models with manual gearbox |
| *3 | From February 2012 |
| G476 | Clutch position sender |
| J104 | ABS control unit |
| J220 | Motronic control unit, central in plenum chamber |
| J519 | Onboard supply control unit |
| T5m | 5-pin connector |
| T47c | 47-pin connector |
| T52b | 52-pin connector |
| T52c | 52-pin connector |
| T80 | 80-pin connector |
| 44 | Earth point, lower part of left A-pillar |
| 367 | Earth connection 2, in main wiring harness |
| 389 | Earth connection 24, in main wiring harness |
| 605 | Earth point, on top end of steering column |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| * | Only models with manual gearbox |
| *2 | Up to February 2012 |
| J119 | Multifunction indicator |
| J285 | Control unit in dash panel insert |
| J519 | Onboard supply control unit |
| J533 | Data bus diagnostic interface, in left footwell, near centre console |
| K132 | Electronic power control fault lamp |
| T16 | 16-pin connector |
| T20 | 20-pin connector |
| T32 | 32-pin connector |
| T52c | 52-pin connector |
| A76 | Connection (K-diagnosis wire), in dash panel wiring harness |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| B397 | Connection 1 (convenience CAN bus, high), in main wiring harness |
| B398 | Connection 2 (convenience CAN bus, high), in main wiring harness |
| B406 | Connection 1 (convenience CAN bus, low), in main wiring harness |
| B407 | Connection 2 (convenience CAN bus, low), in main wiring harness |
| F1 | Oil pressure switch |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G32 | Coolant shortage indicator sender |
| H3 | Buzzer and gong |
| J285 | Control unit in dash panel insert |
| K3 | Oil pressure warning lamp |
| K31 | Cruise control system warning lamp |
| K83 | Exhaust emissions warning lamp |
| K105 | Reserve fuel warning lamp |
| T14a | 14-pin connector, near battery |
| T32 | 32-pin connector |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
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