| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J367 | Battery monitor control unit |
| J519 | Onboard supply control unit |
| SA | Fuse holder A |
| SA1 | Fuse 1 in fuse holder A |
| SA5 | Fuse 5 in fuse holder A |
| SC | Fuse holder C |
| SC43 | Fuse 43 on fuse holder C |
| T2 | 2-pin connector, black |
| T2ai | 2-pin connector, black |
| T8o | 8-pin connector, near left headlight, black |
| T52a | 52-pin connector, black |
| |
| 508 | Threaded connection (30) on E-box |
| A209 | Connection 1 (LIN bus) in dash panel wiring harness |
| B319 | Positive connection 5 (30a) in main wiring harness |
| * | Only models with 110 A alternator |
| *2 | Only models with 140 A/ 180 A alternator |
| *3 | Only models with start/stop system |
| *4 | Only right-hand drive models |
| J329 | Terminal 15 voltage supply relay |
| J519 | Onboard supply control unit |
| J532 | Voltage stabiliser |
| J906 | Starter relay 1 |
| J907 | Starter relay 2 |
| SB | Fuse holder B |
| SB7 | Fuse 7 on fuse holder B |
| SB8 | Fuse 8 on fuse holder B |
| T12c | 12-pin connector, black |
| T40 | 40-pin connector, black |
| T52b | 52-pin connector, white |
| T52c | 52-pin connector, brown |
| |
| 373 | Earth connection 8, in main wiring harness |
| 377 | Earth connection 12, in main wiring harness |
| 508 | Threaded connection (30) on E-box |
| B135 | Connection 1 (15a), in interior wiring harness |
| B163 | Positive connection 1 (15), in interior wiring harness |
| B660 | Connection (diagnosis terminal 50), in main wiring harness |
| * | Only right-hand drive models |
| *2 | Only left-hand drive models |
| G679 | Cylinder 3 combustion chamber pressure sender |
| J179 | Automatic glow period control unit, on left under E-box |
| J623 | Engine control unit, central in plenum chamber |
| N79 | Heater element for crankcase breather |
| Q10 | Glow plug 1 |
| Q11 | Glow plug 2 |
| Q12 | Glow plug 3 |
| Q13 | Glow plug 4 |
| T4az | 4-pin connector, black |
| T11 | 11-pin connector, black, green |
| T14f | 14-pin connector, near left headlight, grey |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| 131 | Earth connection 2, in engine compartment wiring harness |
| * | Only models with crankcase breather heater element |
| GX10 | Lambda probe 1 before catalytic converter |
| G39 | Lambda probe |
| G448 | Exhaust gas temperature sender 2 |
| G495 | Exhaust gas temperature sender 3 |
| G648 | Exhaust gas temperature sender 4 |
| J623 | Engine control unit, central in plenum chamber |
| T2bp | 2-pin connector, in rear of engine compartment, brown |
| T2bq | 2-pin connector, in rear of engine compartment, light brown |
| T2cm | 2-pin connector, in rear of engine compartment, black |
| T6r | 6-pin connector, in rear of engine compartment, black |
| T94 | 94-pin connector, black |
| Z19 | Lambda probe heater |
| 327 | Earth connection (sender earth), in engine compartment wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| * | Only models with auxiliary air heater |
| G31 | Charge pressure sender |
| G70 | Air mass meter |
| G450 | Exhaust gas pressure sensor 1 |
| G811 | Charge air temperature sender after charge air cooler |
| J623 | Engine control unit, central in plenum chamber |
| T3ai | 3-pin connector, black |
| T3bx | 3-pin connector, black |
| T4i | 4-pin connector, black |
| T10t | 10-pin connector, black |
| T14f | 14-pin connector, near left headlight, grey |
| T94 | 94-pin connector, black |
| B369 | Connection 1 (5V), in main wiring harness |
| B370 | Connection 2 (5V), in main wiring harness |
| D197 | Connection 5 (87a) in engine compartment wiring harness |
| J623 | Engine control unit, central in plenum chamber |
| N75 | Charge pressure control solenoid valve |
| N205 | Camshaft control valve 1 |
| N276 | Fuel pressure regulating valve |
| N290 | Fuel metering valve |
| N428 | Valve for oil pressure control |
| N489 | Coolant valve for cylinder head |
| T14f | 14-pin connector, near left headlight, grey |
| T60 | 60-pin connector, black |
| D189 | Connection (87a) in engine prewiring harness |
| D196 | Connection 2 (87a) in engine prewiring harness |
| D197 | Connection 5 (87a) in engine compartment wiring harness |
| G28 | Engine speed sender |
| G62 | Coolant temperature sender |
| G81 | Fuel temperature sender |
| G235 | Exhaust gas temperature sender 1 |
| G247 | Fuel pressure sender |
| G810 | Charge air temperature sender before charge air cooler |
| J623 | Engine control unit, central in plenum chamber |
| T2bo | 2-pin connector, in rear of engine compartment, black |
| T60 | 60-pin connector, black |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 474 | Earth connection (sender earth) in engine prewiring harness |
| D141 | Connection (5V) in engine prewiring harness |
| GX3 | Throttle valve module |
| GX5 | Exhaust gas recirculation valve 1 |
| GX6 | Exhaust gas recirculation valve 2 |
| G69 | Throttle valve potentiometer |
| G186 | Throttle valve drive for electric throttle |
| G212 | Exhaust gas recirculation potentiometer |
| G466 | Exhaust gas recirculation potentiometer 2 |
| J338 | Throttle valve module |
| J623 | Engine control unit, central in plenum chamber |
| T5x | 5-pin connector, black |
| T5y | 5-pin connector, black |
| T6cs | 6-pin connector, grey |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| V338 | Exhaust gas recirculation control motor |
| V339 | Exhaust gas recirculation control motor 2 |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D141 | Connection (5V) in engine prewiring harness |
| G505 | Pressure differential sender |
| G701 | Gearbox neutral position sender |
| J623 | Engine control unit, central in plenum chamber |
| J883 | Exhaust flap control unit |
| T3aj | 3-pin connector, black, brown |
| T3by | 3-pin connector, black |
| T5w | 5-pin connector, black |
| T10t | 10-pin connector, black |
| T94 | 94-pin connector, black |
| 316 | Earth connection (sender earth 2) in engine wiring harness |
| D103 | Connection 3 in engine compartment wiring harness |
| D106 | Connection 4 in engine compartment wiring harness |
| D195 | Connection 1 (5V) in engine compartment wiring harness |
| * | Only models with manual gearbox |
| E16 | Heater/heat output switch |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| J623 | Engine control unit, central in plenum chamber |
| T4x | 4-pin connector, on radiator fan, bottom left, black |
| T8o | 8-pin connector, near left headlight, black |
| T10s | 10-pin connector, near left headlight, black |
| T10t | 10-pin connector, black |
| T20c | 20-pin connector, black |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| V188 | Charge air cooling pump |
| V488 | Auxiliary pump for heating |
| D180 | Connection (87a), in engine compartment wiring harness |
| * | Radiator fan connection |
| *2 | Only models with no air conditioning system |
| *3 | Only models with auxiliary air heater |
| GX19 | Delivery unit for reducing agent metering system, front left in engine compartment |
| G697 | Reducing agent level sender |
| J623 | Engine control unit, central in plenum chamber |
| J891 | Control unit for reducing-agent heater, on right in plenum chamber |
| J963 | Relay for reducing agent metering system |
| T4ba | 4-pin connector, black |
| T4bb | 4-pin connector, black |
| T5aa | 5-pin connector, black |
| T5z | 5-pin connector, black |
| T94 | 94-pin connector, black |
| V437 | Pump for reducing agent |
| V561 | Reducing agent return flow pump |
| Z102 | Heater for reducing-agent tank (heater circuit 1) |
| Z104 | Heater for reducing-agent line (heater circuit 2) |
| 363 | Earth connection 8, in engine compartment wiring harness |
| D188 | Positive connection 3 (30a), in engine compartment wiring harness |
| E78 | Connection 2 (87a) in engine wiring harness |
| F1 | Oil pressure switch |
| F378 | Oil pressure switch for reduced oil pressure |
| G295 | NOx sender |
| J583 | Control unit for NOx sender, on left in engine compartment |
| J623 | Engine control unit, central in plenum chamber |
| T5ab | 5-pin connector, black |
| T8j | 8-pin connector, black |
| T14f | 14-pin connector, near left headlight, grey |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| 281 | Earth point 1, engine prewiring harness |
| 317 | Earth connection 7, in engine compartment wiring harness |
| 640 | Earth point 2, left in engine compartment |
| * | Sheathed cable, black |
| G476 | Clutch position sender |
| J104 | ABS control unit |
| J623 | Engine control unit, central in plenum chamber |
| J743 | Mechatronic unit for dual clutch gearbox |
| T5m | 5-pin connector, black |
| T20e | 20-pin connector, black |
| T25 | 25-pin connector, black |
| T38 | 38-pin connector, brown |
| T94 | 94-pin connector, black |
| 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 | Only models with dual clutch gearbox 02E |
| *3 | Only models with dual clutch gearbox 0AM |
| J119 | Multifunction indicator |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| K83 | Exhaust emissions warning lamp |
| K132 | Electronic power control fault lamp |
| K327 | Reducing agent level warning lamp |
| T16 | 16-pin connector, purple |
| T20 | 20-pin connector, red |
| T32 | 32-pin connector, blue |
| U31 | Diagnostic connection |
| 367 | Earth connection 2, in main 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 |
| B406 | Connection 1 (convenience CAN bus, low), in main wiring harness |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G6 | Fuel system pressurisation pump |
| G32 | Coolant shortage indicator sender |
| G266 | Oil level and oil temperature sender |
| H3 | Buzzer and gong |
| J285 | Control unit in dash panel insert |
| K3 | Oil pressure warning lamp |
| K29 | Glow period warning lamp |
| K31 | Cruise control system warning lamp |
| K38 | Oil level warning lamp |
| K105 | Reserve fuel warning lamp |
| K231 | Diesel particulate filter warning lamp |
| T5a | 5-pin connector, black |
| T10s | 10-pin connector, near left headlight, black |
| T14f | 14-pin connector, near left headlight, grey |
| T32 | 32-pin connector, blue |
| 367 | Earth connection 2, in main wiring harness |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
| * | Only models with flexible service interval display |
