| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| F18 | Radiator fan thermal switch |
| S162 | Fuse -1- (30), in fuse holder on the battery |
| S176 | Fuse -4- (30), in fuse holder on the battery |
| S180 | Fuse -8- (30), in fuse holder on the battery |
| T1a | 1-pin connector, at starter |
| T2v | 2-pin connector, at alternator |
| T2w | 2-pin connector, in the holder on the gearbox |
| T3h | 3-pin connector, at radiator fan thermal switch |
| T3i | 3-pin connector, in the holder on the left radiator |
| T6n | 6-pin connector, at front wall, left (blue) |
| T8a | 8-pin connector, at ignition/starter switch |
| T11a | 11-pin connector, at front wall, left (white) |
| T18a | 18-pin connector, on the onboard power supply control unit (brown) |
| V7 | Radiator fan |
| 12a | Earth point -2-, on left in engine compartment, below the battery (at longitudinal member) |
| P1 | Positive connection (30), in fuse holder on the battery |
| Thermal switch and radiator fan depending upon optional equipment (not valid for vehicles with air conditioning system) |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| Q6 | Glow plugs |
| SB14 | Fuse, in fuse holder |
| T2g | 2-pin connector, on left in engine compartment (connection engine prewiring wiring harness/engine compartment wiring harness) |
| T6w | 6-pin connector, at front wall, left (grey) |
| T11a | 11-pin connector, at front wall, left (white) |
| T11b | 11-pin connector, at front wall, left (red) |
| T14a | 14-pin connector, on left in engine compartment (connection engine prewiring wiring harness/engine compartment wiring harness) |
| T81a | 81-pin connector, at engine control unit |
| 29 | Earth point, on left in engine compartment, behind the battery (on suspension strut mount) |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| A40 | Positive connection (30a), in wiring harness behind dash panel |
| A101 | Connection (87), in wiring harness behind dash panel |
| A151 | Connection (87), in wiring harness behind dash panel |
| D78 | Positive connection -1- (30a), in engine compartment wiring harness |
| D102 | Connection -2- (87a), on left in engine compartment wiring harness |
| D173 | Connection (87), in engine wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| F | Brake light switch |
| F8 | Kick-down switch |
| F36 | Clutch pedal switch |
| F47 | Brake pedal switch |
| F60 | Idling switch |
| G79 | Accelerator pedal position sender |
| G266 | Oil level/oil temperature sender |
| J248 | Diesel direct injection system control unit |
| SB2 | Fuse, in fuse holder |
| T3f | 3-pin connector, at oil level/oil temperature sender |
| T4d | 4-pin connector, at brake pedal switch |
| T4h | 4-pin connector, at clutch pedal switch |
| T6n | 6-pin connector, at front wall, left (blue) |
| T6u | 6-pin connector, at accelerator pedal position sender |
| T11c | 11-pin connector, at front wall, left (blue) |
| T14a | 14-pin connector, on left in engine compartment (connection engine prewiring wiring harness/engine compartment wiring harness) |
| T81a | 81-pin connector, at engine control unit |
| A18 | Connection (54), in wiring harness behind dash panel |
| A100 | Connection (87a), in wiring harness behind dash panel |
| D73 | Connection (54), in engine compartment wiring harness, right |
| D101 | Connection (brake pedal switch), in engine compartment wiring harness |
| D107 | Connection -5- (oil level/oil temperature sender), on left in engine compartment wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| F268 | Heater element contact switch (PTC) |
| G62 | Coolant temperature sender |
| G81 | Fuel temperature sender |
| J248 | Diesel direct injection system control unit |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N239 | Variable intake manifold flap change-over valve |
| T2b | 2-pin connector, at fuel temperature sender |
| T2y | 2-pin connector, at coolant temperature sender |
| T6z | 6-pin connector, at valve block |
| T10c | 10-pin connector, behind dash panel, right |
| T11a | 11-pin connector, at front wall, left (white) |
| T11b | 11-pin connector, at front wall, left (red) |
| T11c | 11-pin connector, at front wall, left (blue) |
| T14a | 14-pin connector, on left in engine compartment (connection engine prewiring wiring harness/engine compartment wiring harness) |
| T16c | 16-pin connector, at the fresh air regulation |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| A130 | Connection (CCS), in wiring harness behind dash panel, left |
| D103 | Connection -3- (87a), in engine compartment wiring harness |
| * | not valid for vehicles with air conditioning system |
| ** | only on vehicles with optional equipment |
| only on vehicles with CCS |
| only on vehicles with heater element (PTC) |
| G28 | Engine speed sender |
| G40 | Camshaft position sender |
| G70 | Air mass meter |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| J248 | Diesel direct injection system control unit |
| N79 | Heating resistor for crankcase ventilation |
| T2m | 2-pin connector, at heating resistor for crankcase ventilation |
| T3j | 3-pin connector, at camshaft position sender |
| T3m | 3-pin connector, at engine speed sender |
| T4g | 4-pin connector, at intake manifold pressure sender and intake manifold temperature sender |
| T5l | 5-pin connector, at air mass meter |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| 85 | Earth connection -1-, on left in engine compartment wiring harness |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| F27 | Connection (screening), in engine prewiring wiring harness |
| ** | only on vehicles with optional equipment |
| valid up to 07.03 |
| valid as of 08.03 |
| 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 |
| T2c | 2-pin connector, at unit injector valve, cylinder 1 |
| T2d | 2-pin connector, at unit injector valve, cylinder 2 |
| T2e | 2-pin connector, at unit injector valve, cylinder 3 |
| T6n | 6-pin connector, at front wall, left (blue) |
| T8o | 8-pin connector, at cylinder head |
| T11a | 11-pin connector, at front wall, left (white) |
| T11c | 11-pin connector, at front wall, left (blue) |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| A76 | Connection (diagnosis wire K), in wiring harness behind dash panel, left |
| A121 | Connection (CAN H), in wiring harness behind dash panel |
| A122 | Connection (CAN L), in wiring harness behind dash panel |
| D159 | Connection (CAN H), in engine compartment wiring harness |
| D160 | Connection (CAN L), in engine compartment wiring harness |
| F26 | Connection (earth), in cylinder head wiring harness |
| only on vehicles with heater element (PTC) |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| S276 | Heater element fuse -1- |
| S277 | Heater element fuse -2- |
| S278 | Heater element fuse -3- |
| T3n | 3-pin connector, behind dash panel (at heater element PTC) |
| TV2 | Terminal 30 wiring junction, behind dash panel, left |
| Z35 | Additional heating heater element (PTC) |
| 606 | Earth point, under the centre console, near gear stick |
| A98 | Positive connection (30a), in wiring harness behind dash panel |
| A152 | Connection (87), in wiring harness behind dash panel |
| only on vehicles with heater element (PTC) |
| J17 | Fuel pump relay |
| J322 | Diesel direct injection system relay |
| T3a | 3-pin connector, at front wall, left (grey) |
| T6r | 6-pin connector, at front wall, left (brown) |
| T11b | 11-pin connector, at front wall, left (red) |
| A15 | Positive connection (15), in wiring harness behind dash panel |
| A32 | Positive connection (30a), in wiring harness behind dash panel |
| A101 | Connection (87), in wiring harness behind dash panel |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| D102 | Connection -2- (87a), on left in engine compartment wiring harness |
| D103 | Connection -3- (87a), in engine compartment wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| F1 | Oil pressure switch |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G6 | Fuel pump |
| G21 | Speedometer |
| G22 | Speedometer 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 | Reserve fuel warning lamp |
| T1b | 1-pin connector, at oil pressure switch |
| T3l | 3-pin connector, at speedometer sender |
| T4j | 4-pin connector, on the fuel pump |
| T6v | 6-pin connector, at front wall, left (green) |
| T11a | 11-pin connector, at front wall, left (white) |
| T11b | 11-pin connector, at front wall, left (red) |
| T14a | 14-pin connector, on left in engine compartment (connection engine prewiring wiring harness/engine compartment wiring harness) |
| T32a | 32-pin connector, at dash panel insert |
| Y4 | Odometer display |
| 199 | Earth connection, in wiring harness behind dash panel |
| 269 | Earth connection (sender earth) -1-, in wiring harness behind dash panel |
| A27 | Connection (speed signal), in wiring harness behind dash panel |
| A139 | Positive connection (15), in wiring harness behind dash panel |
| * | only on vehicles with extended servicing intervals (ESI) |
| ** | not valid for vehicles with ABS/ ABS with EDL and TCS/ ESP |
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