| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| SA | Fuse holder A |
| SA1 | Fuse 1 in fuse holder A |
| SA4 | Fuse 4 in fuse holder A |
| SA7 | Fuse 7 in fuse holder A |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| 14 | Earth point, on gearbox |
| 624 | Earth point, starter battery |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D66 | Positive connection (61), in engine compartment wiring harness |
| D210 | Connection (50), in engine compartment wiring harness |
| * | Only models with manual gearbox |
| F4 | Reversing light switch |
| J329 | Terminal 15 voltage supply relay |
| SB | Fuse holder B |
| SB1 | Fuse 1 on fuse holder B |
| SB3 | Fuse 3 on fuse holder B |
| SB10 | Fuse 10 on fuse holder B |
| SB15 | Fuse 15 on fuse holder B |
| SB16 | Fuse 16 on fuse holder B |
| SB19 | Fuse 19 on fuse holder B |
| SB20 | Fuse 20 on fuse holder B |
| SB30 | Fuse 30 on fuse holder B |
| SB31 | Fuse 31 on fuse holder B |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10c | 10-pin connector, yellow, in E-box in engine compartment |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| B165 | Positive connection 2 (15), in interior wiring harness |
| D17 | Positive connection 1 (15), in engine harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D101 | Connection 1 in engine compartment wiring harness |
| * | Only models with manual gearbox |
| J623 | Engine control unit, in E-box |
| 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 |
| T10e | 10-pin connector, white, in E-box in engine compartment |
| T60 | 60-pin connector, black |
| 15 | Earth point, on cylinder head |
| 306 | Earth connection (ignition coils), in engine prewiring harness |
| 484 | Earth connection 2 (ignition coils), in engine prewiring harness |
| D104 | Positive connection 2 (30a), in engine compartment wiring harness |
| D113 | Connection 11 in engine compartment wiring harness |
| J623 | Engine control unit, in E-box |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| N79 | Heater element for crankcase breather |
| T10e | 10-pin connector, white, in E-box in engine compartment |
| T14d | 14-pin connector, black, on front of engine |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| V51 | Continued coolant circulation pump |
| 12 | Earth point, on left in engine compartment |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 132 | Earth connection 3, in engine compartment wiring harness |
| 484 | Earth connection 2 (ignition coils), in engine prewiring harness |
| F366 | Actuator 1 for camshaft adjustment |
| F367 | Actuator 2 for camshaft adjustment |
| F368 | Actuator 3 for camshaft adjustment |
| F369 | Actuator 4 for camshaft adjustment |
| F370 | Actuator 5 for camshaft adjustment |
| F371 | Actuator 6 for camshaft adjustment |
| F372 | Actuator 7 for camshaft adjustment |
| F373 | Actuator 8 for camshaft adjustment |
| J623 | Engine control unit, in E-box |
| T10e | 10-pin connector, white, in E-box in engine compartment |
| T60 | 60-pin connector, black |
| D181 | Connection 2 (87a) in engine compartment wiring harness |
| G62 | Coolant temperature sender |
| J235 | Coolant pump relay, in E-box |
| J335 | Fuel shut-off valve switch-off relay, in E-box |
| J496 | Additional coolant pump relay, in E-box |
| J623 | Engine control unit, in E-box |
| J708 | Residual heat relay |
| N276 | Fuel pressure regulating valve |
| T10e | 10-pin connector, white, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T14d | 14-pin connector, black, on front of engine |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| D180 | Connection (87a), in engine compartment wiring harness |
| G40 | Hall sender |
| G42 | Intake air temperature sender |
| G61 | Knock sensor 1 |
| G247 | Fuel pressure sender |
| G701 | Gearbox neutral position sender |
| J623 | Engine control unit, in E-box |
| T3be | 3-pin connector, green, on front of engine |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D141 | Connection (5V) in engine prewiring harness |
| * | Only models with manual gearbox |
| E45 | Cruise control system switch |
| F | Brake light switch, on brake master cylinder |
| G476 | Clutch position sender |
| J104 | ABS control unit |
| J623 | Engine control unit, in E-box |
| J743 | Mechatronic unit for dual clutch gearbox |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T10f | 10-pin connector, green, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T16m | 16-pin connector, black |
| T38a | 38-pin connector, black |
| T41 | 41-pin connector, grey |
| T94 | 94-pin connector, black |
| B131 | Connection (54), in interior wiring harness |
| B441 | Connection (CCS), in main wiring harness |
| D109 | Connection 7 in engine compartment wiring harness |
| * | Only models with cruise control system (CCS) |
| *2 | Only models with manual gearbox |
| *3 | Only models with dual clutch gearbox |
| D | Ignition/starter switch |
| J623 | Engine control unit, in E-box |
| J906 | Starter relay 1, in E-box |
| J907 | Starter relay 2, in E-box |
| SC | Fuse holder C, in centre of dash panel |
| SC23 | Fuse 23 on fuse holder C |
| SC56 | Fuse 56 on fuse holder C |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| B239 | Positive connection 1 (50), in interior wiring harness |
| B273 | Positive connection (15), in main wiring harness |
| D107 | Connection 5 in engine compartment wiring harness |
| D108 | Connection 6 in engine compartment wiring harness |
| * | Only models with no electric interface |
| G83 | Radiator outlet coolant temperature sender |
| J623 | Engine control unit, in E-box |
| N75 | Charge pressure control solenoid valve |
| N80 | Activated charcoal filter solenoid valve 1 |
| N205 | Camshaft control valve 1 |
| N249 | Turbocharger air recirculation valve |
| N316 | Intake manifold flap valve |
| T10e | 10-pin connector, white, in E-box in engine compartment |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| D189 | Connection (87a) in engine prewiring harness |
| J293 | Radiator fan control unit |
| J623 | Engine control unit, in E-box |
| T4ak | 4-pin connector, black, near radiator fan |
| T4ax | 4-pin connector, black, near radiator fan |
| T94 | 94-pin connector, black |
| V7 | Radiator fan |
| 642 | Earth point for electronically controlled fan |
| * | Only models with medium fan output |
| *2 | Only models with increased fan output |
| *3 | Only models with low fan output |
| G69 | Throttle valve potentiometer |
| G79 | Accelerator position sender |
| G185 | Accelerator position sender 2 |
| G186 | Throttle valve drive for electric throttle |
| G188 | Throttle valve drive angle sender 2 for electric throttle |
| J338 | Throttle valve module |
| J623 | Engine control unit, in E-box |
| T6az | 6-pin connector, black |
| T6t | 6-pin connector, black |
| T10d | 10-pin connector, blue, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| G39 | Lambda probe |
| G130 | Lambda probe after catalytic converter |
| J623 | Engine control unit, in E-box |
| T4k | 4-pin connector, black, on underbody, next to auxiliary heater |
| T6ax | 6-pin connector, black, on right in engine compartment |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10d | 10-pin connector, blue, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T17p | 17-pin connector, red, under driver seat |
| T94 | 94-pin connector, black |
| Z19 | Lambda probe heater |
| Z29 | Lambda probe 1 heater after catalytic converter |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| D119 | Connection 17 in engine compartment wiring harness |
| D159 | Connection (high bus), in engine compartment wiring harness |
| D160 | Connection (low bus), in engine compartment wiring harness |
| J59 | X-contact relief relay |
| J285 | Control unit in dash panel insert |
| J519 | Onboard supply control unit |
| K | Dash panel insert |
| SC | Fuse holder C, in centre of dash panel |
| SC2 | Fuse 2 on fuse holder C |
| SC26 | Fuse 26 on fuse holder C |
| T32 | 32-pin connector, blue |
| T73a | 73-pin connector, black |
| T73b | 73-pin connector, white |
| 370 | Earth connection 5, in main wiring harness |
| 371 | Earth connection 6, in main wiring harness |
| 636 | Earth point, onboard supply control unit |
| B138 | Positive connection (X), in interior wiring harness |
| B173 | Positive connection 2 (X), in interior wiring harness |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| B708 | Connection 1 (dash panel insert CAN bus high) in main wiring harness |
| B709 | Connection 1 (dash panel insert CAN bus low) in main wiring harness |
| * | Only models with no rain and light sensor |
| *2 | Only models with no tachograph |
| *3 | Only models with rain sensor |
| *4 | Only models with tachograph |
| G | Fuel gauge sender |
| G6 | Fuel system pressurisation pump |
| G266 | Oil level and oil temperature sender |
| J285 | Control unit in dash panel insert |
| J538 | Fuel pump control unit |
| K | Dash panel insert |
| K2 | Alternator warning lamp |
| SC30 | Fuse 30 on fuse holder C |
| T3bc | 3-pin connector, black, on underbody, near cross panel |
| T5t | 5-pin connector, black |
| T6b | 6-pin connector, black, on fuel tank |
| T32 | 32-pin connector, blue |
| Y4 | Trip counter |
| 366 | Earth connection 1, in main wiring harness |
| 367 | Earth connection 2, in main wiring harness |
| 368 | Earth connection 3, in main wiring harness |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
| 636 | Earth point, onboard supply control unit |
| B278 | Positive connection 2 (15a) in main wiring harness |
| * | Only models with extended servicing intervals (ESI) |
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