| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| T1a | 1-pin connector, at starter |
| T1c | 1-pin connector, for starter, in the holder on the gearbox |
| T2x | 2-pin connector, at alternator |
| T8a | 8-pin connector, at ignition/starter switch |
| T10g | 10-pin connector, in plenum chamber (black) |
| T10k | 10-pin connector, in plenum chamber (brown) |
| 1 | Earth strap, battery body |
| 3 | Earth strap, engine - body |
| 13 | Earth point, on right in engine compartment |
| * | not valid for vehicles with automatic gearbox |
| D | Ignition/starter switch |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| N79 | Heating resistor for crankcase ventilation |
| Q6 | Glow plugs |
| S125 | Glow plug fuse, at relay holder in plenum chamber |
| T2g | 2-pin connector, at heating resistor for crankcase ventilation |
| T10g | 10-pin connector, in plenum chamber (black) |
| T10m | 10-pin connector, in plenum chamber (orange) |
| T81a | 81-pin connector, at engine control unit |
| 28 | Earth point, at the front wall, left |
| 85 | Earth connection, in engine compartment wiring harness |
| A2 | Positive connection (15), in dash panel wiring harness |
| D98 | Connection (glow plugs), in engine compartment wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| Optional equipement |
| J248 | Diesel direct injection system control unit |
| J322 | Diesel direct injection system relay |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| S131 | Fuse 1, at relay holder in plenum chamber |
| T2m | 2-pin connector, at exhaust gas recirculation valve |
| T2z | 2-pin connector, at charge pressure control solenoid valve |
| T3d | 3-pin connector, in plenum chamber (red) |
| T3l | 3-pin connector, in plenum chamber (white) |
| T10m | 10-pin connector, in plenum chamber (orange) |
| T81a | 81-pin connector, at engine control unit |
| A52 | Positive connection -2- (30), in dash panel wiring harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| F25 | Connection (87), in engine wiring harness |
| F38 | Ambient temperature switch |
| G28 | Engine speed sender |
| G40 | Hall sender |
| J59 | X contact relief relay |
| J248 | Diesel direct injection system control unit |
| J255 | Climatronic control unit |
| N239 | Variable intake manifold flap change-over valve |
| T2o | 2-pin connector, at variable intake manifold flap change-over valve |
| T3j | 3-pin connector, at engine speed sender (grey), at the front wall, left |
| T3r | 3-pin connector, at Hall sender (black), at the front wall, left |
| T10k | 10-pin connector, in plenum chamber (brown) |
| T12d | 12-pin connector, at climatronic control unit (black) |
| T15b | 15-pin connector, in plenum chamber (red) |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| A34 | Connection (75x), in dash panel wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| F27 | Connection (screening), in engine wiring harness |
| * | only on vehicles with air conditioning system |
| ** | only on vehicles with Climatronic |
| only for engine identification characters AVF |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Brake pedal switch |
| J104 | ABS control unit with EDL and TCS/ESP |
| J248 | Diesel direct injection system control unit |
| SB13 | Fuse, in fuse holder |
| T4b | 4-pin connector, at brake pedal switch |
| T4t | 4-pin connector, at clutch pedal switch |
| T10m | 10-pin connector, in plenum chamber (orange) |
| T15a | 15-pin connector, in plenum chamber (white) |
| T15b | 15-pin connector, in plenum chamber (red) |
| T42a | 42-pin connector, at ABL control unit with EDS and TCS/ESP |
| T81a | 81-pin connector, at engine control unit |
| A18 | Connection (54), in dash panel wiring harness |
| A121 | Connection (CAN H), in dash panel wiring harness |
| A122 | Connection (CAN L), in dash panel wiring harness |
| A154 | Connection (brake pedal switch), in dash panel wiring harness |
| A193 | Connection (87a), in dash panel wiring harness |
| * | only on vehicles with ESP |
| ** | not valid for vehicles with automatic gearbox |
| E45 | Cruise control system switch |
| E227 | Cruise control system (CCS) button (Set) |
| J248 | Diesel direct injection system control unit |
| J255 | Climatronic control unit |
| J314 | Air conditioning system control unit |
| J397 | Radiator fan run-on relay |
| T10m | 10-pin connector, in plenum chamber (orange) |
| T10n | 10-pin connector, at CCS switch |
| T15a | 15-pin connector, in plenum chamber (white) |
| T15b | 15-pin connector, in plenum chamber (red) |
| T15d | 15-pin connector, on left A-pillar (grey) |
| T16e | 16-pin connector, at climatronic control unit (brown) |
| T81a | 81-pin connector, at engine control unit |
| A130 | Connection (cruise control), in dash panel wiring harness |
| A193 | Connection (87a), in dash panel wiring harness |
| * | only on vehicles with air conditioning system |
| ** | only on vehicles with Climatronic |
| only on vehicles with CCS |
| F268 | Additional heating heater element contact switch (PTC) |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| J248 | Diesel direct injection system control unit |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| N240 | Unit injector valve, cylinder 1 |
| N241 | Unit injector valve, cylinder 2 |
| N242 | Unit injector valve, cylinder 3 |
| N243 | Unit injector valve, cylinder 4 |
| T4k | 4-pin connector, at intake manifold pressure sender and intake manifold temperature sender |
| T8e | 8-pin connector, at cylinder head |
| T10g | 10-pin connector, in plenum chamber (black) |
| T15b | 15-pin connector, in plenum chamber (red) |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| F26 | Connection (earth), in cylinder head wiring harness |
| * | only on vehicles with additional heater (PTC) |
| not valid for vehicles with Climatronic |
| F4 | Reversing light switch |
| F8 | Kick-down switch |
| F60 | Idling switch |
| G70 | Air mass meter |
| G79 | Accelerator pedal position sender |
| J248 | Diesel direct injection system control unit |
| SB31 | Fuse, in fuse holder |
| T5d | 5-pin connector, at air mass meter |
| T6l | 6-pin connector, at accelerator pedal position sender |
| T10k | 10-pin connector, in plenum chamber (brown) |
| T15a | 15-pin connector, in plenum chamber (white) |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| A70 | Positive connection (15a, fuse 31), in dash panel wiring harness |
| D136 | Positive connection -2- (15a), in engine compartment wiring harness |
| * | not valid for vehicles with automatic gearbox |
| G81 | Fuel temperature sender |
| J17 | Fuel pump relay |
| J248 | Diesel direct injection system control unit |
| T2n | 2-pin connector, at fuel temperature sender |
| T10k | 10-pin connector, in plenum chamber (brown) |
| T10m | 10-pin connector, in plenum chamber (orange) |
| T40a | 40-pin connector, at engine control unit |
| T81a | 81-pin connector, at engine control unit |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G2 | Coolant temperature gauge sender |
| G3 | Coolant temperature gauge |
| G5 | Rev. Counter |
| G6 | Fuel pump |
| G62 | Coolant temperature sender |
| J285 | Control unit in dash panel insert |
| K | Dash panel insert |
| K16 | Reserve fuel warning lamp |
| K28 | Coolant temperature and coolant shortage indicator warning lamp |
| T4h | 4-pin connector, at coolant temperature sender |
| T4l | 4-pin connector, on the fuel pump |
| T6e | 6-pin connector, on left A-pillar (blue) |
| T10e | 10-pin connector, on left A-pillar (brown) |
| T10g | 10-pin connector, in plenum chamber (black) |
| T32a | 32-pin connector, at dash panel insert (blue) |
| T32b | 32-pin connector, at dash panel insert (green) |
| 87 | Earth connection -2-, in rear wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 316 | Earth connection (sender earth) -2-, in engine wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| F1 | Oil pressure switch |
| G21 | Speedometer |
| G22 | Speedometer sender (on gearbox) |
| G266 | Oil level/oil temperature sender |
| J285 | Control unit in dash panel insert |
| K | Dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K29 | Glow period warning lamp |
| K38 | Oil level warning lamp |
| K83 | Exhaust emissions warning lamp |
| SB5 | Fuse, in fuse holder |
| T1b | 1-pin connector, at oil pressure switch |
| T3f | 3-pin connector, at speedometer sender |
| T3k | 3-pin connector, at oil level/oil temperature sender |
| T10g | 10-pin connector, in plenum chamber (black) |
| T10k | 10-pin connector, in plenum chamber (brown) |
| T32a | 32-pin connector, at dash panel insert (blue) |
| T32b | 32-pin connector, at dash panel insert (green) |
| 85 | Earth connection, in engine compartment wiring harness |
| A17 | Connection (61), in dash panel wiring harness |
| A20 | Positive connection (15a), in dash panel wiring harness |
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