| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J293 | Radiator fan control unit |
| SA11 | Fuse 1 on fuse holder engine compartment |
| SA13 | Fuse 3 on fuse holder engine compartment |
| SA15 | Fuse 5 on fuse holder engine compartment |
| SA17 | Fuse 7 on fuse holder engine compartment |
| T3b | 3-pin connector, on radiator fan |
| T4g | 4-pin connector, black, on fuse holder |
| T4k | 4-pin connector, black, on radiator fan control unit |
| T5 | 5-pin connector, near starter |
| T6s | 6-pin connector, black, on radiator fan control unit |
| T10a | 10-pin connector, green, coupling station under relay carrier |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| V7 | Radiator fan |
| 1 | Earth strap, battery - body |
| 3 | Earth strap, engine - body |
| 12 | Earth point, on left in engine compartment |
| 167 | Earth connection 4, in engine compartment wiring harness |
| C55 | Positive connection (30a), in front left wiring harness |
| * | To May 2002 |
| ** | From May 2002 |
| D | Ignition/starter switch |
| G28 | Engine speed sender |
| J220 | Motronic control unit |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| P | Spark plug connector |
| Q | Spark plug |
| S51 | Fuse 51, near relay carrier |
| S115 | Ignition coil terminal 15 fuse, under relay carrier |
| SB36 | Fuse 36 on fuse holder |
| T3e | 3-pin connector |
| T4b | 4-pin connector, black |
| T4l | 4-pin connector, black |
| T4m | 4-pin connector, black |
| T6o | 6-pin connector, coupling station under relay carrier |
| T10a | 10-pin connector, green, coupling station under relay carrier |
| T14d | 14-pin connector, left on engine |
| T121 | 121-pin connector |
| 8 | Earth strap, cylinder head cover - ignition coil |
| 12 | Earth point, on left in engine compartment |
| 93 | Earth connection, engine earth, in fully electronic ignition system wiring harness |
| A2 | Positive connection (15), in dash panel wiring harness |
| A15 | Connection (15), in dash panel wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| E14 | Connection 1, in Motronic wiring harness |
| F | Brake light switch |
| F47 | Cruise control system brake pedal switch/diesel direct injection system |
| G79 | Accelerator position sender |
| G185 | Accelerator position sender 2 |
| G186 | Throttle valve drive (electric power control) |
| G187 | Throttle valve drive angle sender 1 (electric power control) |
| G188 | Throttle valve drive angle sender 2 (electric power control) |
| J220 | Motronic control unit |
| J338 | Throttle valve module |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plug |
| SB15 | Fuse 15 on fuse holder |
| SB24 | Fuse 24 on fuse holder |
| T4p | 4-pin connector, black |
| T6a | 6-pin connector, black |
| T6b | 6-pin connector, on pedal value sender |
| T10 | 10-pin connector, white, coupling station under relay carrier |
| T10s | 10-pin connector, grey, coupling station under relay carrier |
| T14 | 14-pin connector, left on engine |
| T14a | 14-pin connector, left on engine |
| T14d | 14-pin connector, left on engine |
| T121 | 121-pin connector |
| 8 | Earth strap, cylinder head cover - ignition coil |
| 93 | Earth connection, engine earth, in fully electronic ignition system wiring harness |
| A89 | Connection 2 (54), in dash panel wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| D136 | Positive connection 2 (15a), in engine compartment wiring harness |
| G2 | Coolant temperature sender |
| G40 | Hall sender I |
| G62 | Coolant temperature sender |
| J104 | ABS control unit with EDL |
| J220 | Motronic control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| T3 | 3-pin connector, on left of cylinder head |
| T8m | 8-pin connector, on left of cylinder head |
| T10s | 10-pin connector, grey, coupling station under relay carrier |
| T14d | 14-pin connector, left on engine |
| T47 | 47-pin connector, on ABS control unit with EDL |
| T121 | 121-pin connector, on Motronic control unit |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| D137 | Connection 2 (injectors), in engine compartment wiring harness |
| D159 | Connection (high bus), in engine compartment wiring harness |
| D160 | Connection (low bus), in engine compartment wiring harness |
| G39 | Lambda probe before catalytic converter |
| G65 | High-pressure sender |
| G212 | Potentiometer for exhaust gas recirculation |
| J220 | Motronic control unit |
| J255 | Climatronic control unit |
| J362 | Immobiliser control unit |
| J271 | Motronic current supply relay |
| N18 | Exhaust gas recirculation valve |
| N80 | Activated charcoal filter system solenoid valve 1 |
| S131 | Fuse 1, below relay carrier |
| T3c | 6-pin connector |
| T6d | 6-pin connector |
| T6e | 6-pin connector, in engine compartment |
| T6o | 6-pin connector, coupling station under relay carrier |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| T10u | 10-pin connector, pink, coupling station under relay carrier |
| T14 | 14-pin connector, left on engine |
| T14a | 14-pin connector, black, on left on cylinder head |
| T16b | 16-pin connector |
| T121 | 121-pin connector |
| 281 | Earth connection 1, in engine wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| E32 | Connection (87), in Motronic wiring harness |
| D141 | Connection (5V), in engine wiring harness |
| L2 | Connection in air conditioning system wiring harness |
| P1 | Positive connection (30), in battery fuse holder |
| * | Only models with Climatronic |
| G71 | Intake manifold pressure sender |
| G295 | NOx sender |
| J220 | Motronic control unit |
| J583 | NOx sensor control unit |
| T6o | 6-pin connector, coupling station under relay carrier |
| T10 | 10-pin connector, black, in engine compartment |
| T10m | 10-pin connector, brown, coupling station under relay carrier |
| T10y | 10-pin connector, on NOx sensor control unit |
| T14 | 14-pin connector, brown, coupling station under relay carrier |
| T14x | 14-pin connector, black, next to NOx sensor control unit |
| T121 | 121-pin connector, on Motronic control unit |
| 10 | Earth point, in plenum chamber |
| D169 | Connection (NOx), in engine compartment wiring harness |
| D170 | Connection (NOx+), in engine compartment wiring harness |
| D171 | Connection (NOx-), in engine compartment wiring harness |
| E43 | Connection (87), in injection system wiring harness |
| * | Wire is composed of 12 single wires |
| ** | Wire is composed of 6 single wires |
| G70 | Air mass meter |
| G83 | Radiator outlet coolant temperature sender |
| G235 | Exhaust gas temperature sender 1 |
| G267 | Potentiometer, temperature selection rotary knob |
| G294 | Brake servo pressure sensor |
| J220 | Motronic control unit |
| N276 | Fuel pressure regulating valve |
| T6o | 6-pin connector, coupling station under relay carrier |
| T8 | 8-pin connector |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| T10u | 10-pin connector, pink, coupling station under relay carrier |
| T14a | 14-pin connector, black, on left on cylinder head |
| T121 | 121-pin connector, Motronic control unit |
| D169 | Connection (NOx), in engine compartment wiring harness |
| D170 | Connection (NOx+), in engine compartment wiring harness |
| E32 | Connection (87), in Motronic wiring harness |
| * | Not with Climatronic |
| F265 | Map-controlled engine cooling system thermostat |
| G247 | Fuel pressure sender |
| G267 | Potentiometer, temperature selection rotary knob |
| G336 | Intake manifold flap potentiometer |
| J220 | Motronic control unit |
| N205 | Inlet camshaft control valve 1 |
| N290 | Fuel metering valve |
| N316 | Intake manifold flap air flow control valve |
| SB3 | Fuse 3 on relay plate fuse holder |
| SB30 | Fuse 30 on relay plate fuse holder |
| SB37 | Fuse 37 on relay plate fuse holder |
| T6o | 6-pin connector, coupling station under relay carrier |
| T8 | 8-pin connector |
| T10u | 10-pin connector, pink, coupling station under relay carrier |
| T14 | 14-pin connector, brown, on left on cylinder head |
| T14a | 14-pin connector, black, on left on cylinder head |
| T14d | 14-pin connector, in engine compartment |
| T121 | 121-pin connector, Motronic control unit |
| A100 | Connection 2 (87), in dash panel wiring harness |
| E7 | Positive connection (87a), in Motronic wiring harness |
| * | Not with Climatronic |
| G61 | Knock sensor 1 |
| J17 | Fuel pump relay |
| J220 | Motronic control unit |
| J234 | Airbag control unit, behind lower part of console |
| J379 | Central locking and anti-theft alarm system control unit |
| SB11 | Fuse 11 on fuse holder |
| T2 | 2-pin connector, black |
| T10b | 10-pin connector, black, coupling station under relay carrier |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| T14 | 14-pin connector, brown, on left on cylinder head |
| T16 | 16-pin connector, near handbrake lever, self-diagnosis connection |
| T121 | 121-pin connector, on Motronic control unit |
| 76 | Earth point, near selector mechanism |
| 81 | Earth connection 1, in dash panel wiring harness |
| 502 | Screw connection 1 (30a), on relay plate |
| A32 | Positive connection (30), in dash panel wiring harness |
| A41 | Positive connection (50), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| B111 | Positive connection 1 (30a), in interior wiring harness |
| B150 | Positive connection 2 (30a), in interior wiring harness |
| B154 | Positive connection 1 (DCt), in interior wiring harness |
| G | Fuel gauge sender |
| G6 | Fuel pump |
| G22 | Speedometer sender (Hall sender on gearbox) |
| G32 | Coolant shortage indicator sender |
| SB1 | Fuse 1 on relay plate fuse holder |
| SB28 | Fuse 28 on fuse holder |
| SB40 | Fuse 40 on fuse holder |
| T8h | 8-pin connector, on gearbox |
| T10a | 10-pin connector, green, coupling station under relay carrier |
| T10b | 10-pin connector, black, coupling station under relay carrier |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| 12 | Earth point, on left in engine compartment |
| 50 | Earth point, on left in luggage compartment |
| 131 | Earth connection 2, in engine compartment wiring harness |
| A99 | Connection 1 (87), in dash panel wiring harness |
| B109 | Earth connection, in rear left interior wiring harness |
| B149 | Positive connection 2 (15a), in interior wiring harness |
| F1 | Oil pressure switch |
| G1 | Fuel gauge |
| G3 | Coolant temperature display |
| G5 | Rev. counter |
| H11 | Oil pressure warning buzzer |
| J514 | Electronic manual gearbox control unit |
| J285 | Control unit with display in dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature/coolant shortage warning lamp |
| K105 | Reserve fuel warning lamp |
| T10a | 10-pin connector, green, coupling station under relay carrier |
| T10c | 10-pin connector, blue, coupling station under relay carrier |
| T10d | 10-pin connector, red, coupling station under relay carrier |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| T68 | 68-pin connector, on electronic manual gearbox control unit |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
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