| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| SA1 | Fuse -1- (30), in the E box |
| T2t | 2-pin connector, in engine compartment, front left (on vehicles with heating) |
| T4n | 4-pin connector, in engine compartment, front left (on vehicles with Climatic / Climatronic) |
| T8a | 8-pin connector, on the onboard power supply control unit (black) |
| 1 | Earth strap, battery body |
| 12 | Earth point, on left in engine compartment (at longitudinal member) |
| 14 | Earth point, on gearbox |
| * | on vehicles with alternator 90A / 110A |
| ** | on vehicles with alternator 140A |
| SC1 | Fuse -1-, in fuse holder |
| SC27 | Fuse -27-, in fuse holder |
| SC29 | Fuse -29-, in fuse holder |
| SC30 | Fuse -30-, in fuse holder |
| SC31 | Fuse -31-, in fuse holder |
| A20 | Positive connection -1- (15a), in dash panel wiring harness |
| B280 | Positive connection -4- (15a), in interior wiring harness |
| B281 | Positive connection -5- (15a), in interior wiring harness |
| B315 | Positive connection -1- (30a), in interior wiring harness |
| J682 | Terminal 50 voltage supply relay, at additional relay holder below dash panel |
| SC2 | Fuse -2-, in fuse holder |
| SC4 | Fuse -4-, in fuse holder |
| T8a | 8-pin connector, on the onboard power supply control unit (black) |
| T11a | 11-pin connector, on the onboard power supply control unit (black) |
| 374 | Earth connection -9-, in interior wiring harness |
| A20 | Positive connection -1- (15a), in dash panel wiring harness |
| A38 | Positive connection -2- (15a), in dash panel wiring harness |
| B239 | Positive connection -1- (50), in interior wiring harness |
| B279 | Positive connection -3- (15a), in interior wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| G31 | Charge air pressure sender |
| G42 | Intake air temperature sender |
| G79 | Accelerator pedal position sender |
| G185 | Accelerator pedal position sender -2- |
| J248 | Diesel direct injection system control unit |
| T4o | 4-pin connector, at charge air pressure sender and intake air temperature sender |
| T6l | 6-pin connector, at accelerator pedal position sender |
| T94a | 94-pin connector, at engine control unit |
| G28 | Engine speed sender |
| G40 | Camshaft position sender |
| G62 | Coolant temperature sender |
| G83 | Coolant temperature sender at radiator outlet |
| J248 | Diesel direct injection system control unit |
| J293 | Radiator fan control unit |
| T3l | 3-pin connector, at engine speed sender |
| T3m | 3-pin connector, at camshaft position sender |
| T4p | 4-pin connector, in the holder on the left radiator |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| G81 | Fuel temperature sender |
| J248 | Diesel direct injection system control unit |
| N240 | Unit injector valve, cylinder 1 |
| N241 | Unit injector valve, cylinder 2 |
| N242 | Unit injector valve, cylinder 3 |
| N243 | Unit injector valve, cylinder 4 |
| T8j | 8-pin connector, at cylinder head |
| T60a | 60-pin connector, at engine control unit |
| F25 | Connection (earth), in engine wiring harness |
| F26 | Connection (earth), in cylinder head wiring harness |
| G70 | Air mass meter |
| J248 | Diesel direct injection system control unit |
| N75 | Charge pressure control solenoid valve |
| N345 | Exhaust gas recirculation cooler change-over valve |
| T5h | 5-pin connector, at air mass meter |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| D102 | Connection (87a), in engine compartment wiring harness |
| G39 | Lambda probe |
| J248 | Diesel direct injection system control unit |
| N79 | Heating resistor for crankcase ventilation |
| T6n | 6-pin connector, at the lambda probe (black), at the front wall, left |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T94a | 94-pin connector, at engine control unit |
| 673 | Earth point -3-, on left in engine compartment (at longitudinal member) |
| * | only on vehicles with optional equipment |
| G212 | Exhaust gas recirculation potentiometer |
| J248 | Diesel direct injection system control unit |
| N18 | Exhaust gas recirculation valve |
| T5n | 5-pin connector, at intake manifold flap motor |
| T6x | 6-pin connector, on exhaust gas recirculation control motor |
| T60a | 60-pin connector, at engine control unit |
| V157 | Intake manifold flap motor |
| V338 | Exhaust gas recirculation control motor |
| G450 | Exhaust gas pressure sensor -1-, in the holder on the engine |
| G506 | Temperature sender upstream particle filter |
| G507 | Temperature sender upstream turbocharger |
| G527 | Temperature sender downstream particle filter |
| J248 | Diesel direct injection system control unit |
| T2l | 2-pin connector, at temperature sender upstream turbocharger (black), at the front wall, left |
| T2m | 2-pin connector, at temperature sender upstream particle filter (brown), at the front wall, left |
| T2n | 2-pin connector, at temperature sender downstream particle filter (orange), at the front wall, left |
| T3e | 3-pin connector, at exhaust gas pressure sensor -1- |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| F | Brake light switch, at master brake cylinder |
| F47 | Brake pedal switch, at master brake cylinder |
| G476 | Clutch position sender |
| J248 | Diesel direct injection system control unit |
| J527 | Steering column electronics control unit |
| T4c | 4-pin connector, at brake pedal switch |
| T5j | 5-pin connector, at clutch position sender |
| T16a | 16-pin connector, on the onboard power supply control unit (black) |
| T20a | 20-pin connector, at steering column electronics control unit |
| T94a | 94-pin connector, at engine control unit |
| 372 | Earth connection -7-, in interior wiring harness |
| 374 | Earth connection -9-, in interior wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| * | not valid for vehicles with automatic gearbox Gearbox |
| G3 | Coolant temperature gauge |
| J248 | Diesel direct injection system control unit |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface, below dash panel, centre |
| K | Dash panel insert |
| K28 | Coolant temperature and coolant shortage indicator warning lamp |
| K231 | Diesel particle filter warning lamp |
| T16b | 16-pin connector, for diagnostic connection, below dash panel, left |
| T20c | 20-pin connector, at data bus diagnostic interface |
| T36a | 36-pin connector, at dash panel insert |
| T94a | 94-pin connector, at engine control unit |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| B383 | Connection -1- (CAN H, drive), in interior wiring harness |
| B390 | Connection -1- (CAN L, drive), in interior wiring harness |
| F1 | Oil pressure switch |
| G1 | Fuel gauge |
| G5 | Rev. Counter |
| G21 | Speedometer |
| G169 | Fuel level sender -2- |
| G266 | Oil level/oil temperature sender |
| J285 | Control unit in dash panel insert |
| K | Dash panel insert |
| K3 | Oil pressure warning lamp |
| K29 | Glow period warning lamp |
| K38 | Oil level warning lamp |
| K83 | Exhaust emissions warning lamp |
| K105 | Fuel reserve warning lamp |
| T6j | 6-pin connector, on front left in engine compartment (black) |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T36a | 36-pin connector, at dash panel insert |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 374 | Earth connection -9-, in interior wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| ** | only for vehicles with four-wheel drive |
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