| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| E74 | Battery master/isolator switch |
| J518 | Entry and start authorisation control unit |
| J682 | Terminal 50 voltage supply relay |
| S1 | Fuse in relay plate fuse holder, in engine compartment |
| S7 | Fuse in relay plate fuse holder, in engine compartment |
| S8 | Fuse in relay plate fuse holder, in engine compartment |
| S9 | Fuse in relay plate fuse holder, in engine compartment |
| T6ma | 6-pin connector, white, on electronics box engine compartment |
| T10c | 10-pin connector, pink, electronics box engine compartment |
| T10d | 10-pin connector, blue, electronics box engine compartment |
| T10f | 10-pin connector, red, electronics box front engine compartment |
| T81 | 81-pin connector, on entry and start authorisation control unit |
| TV2 | Terminal 30 wiring junction, starting aid point |
| TV22 | Terminal 30 wiring junction 2, under the seat on front left |
| D123 | Connection 21, in engine compartment wiring harness |
| D144 | Positive connection 5 (30), in engine compartment wiring harness |
| S2 | Fuse in relay plate fuse holder, in engine compartment |
| S3 | Fuse in relay plate fuse holder, in engine compartment |
| S10 | Fuse in relay plate fuse holder, in engine compartment |
| S11 | Fuse in relay plate fuse holder, in engine compartment |
| S12 | Fuse in relay plate fuse holder, in engine compartment |
| S13 | Fuse in relay plate fuse holder, in engine compartment |
| S14 | Fuse in relay plate fuse holder, in engine compartment |
| S15 | Fuse in relay plate fuse holder, in engine compartment |
| S16 | Fuse in relay plate fuse holder, in engine compartment |
| S17 | Fuse in relay plate fuse holder, in engine compartment |
| S18 | Fuse in relay plate fuse holder, in engine compartment |
| D75 | Positive connection 2 (30), in engine compartment wiring harness |
| D121 | Connection 19, in engine compartment wiring harness |
| D123 | Connection 21, in engine compartment wiring harness |
| J220 | Motronic control unit |
| J271 | Motronic current supply relay |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T10k | 10-pin connector, black |
| T121a | 121-pin connector, on engine control unit |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 132 | Earth connection 3, in engine compartment wiring harness |
| 209 | Earth connection 6, in engine compartment wiring harness |
| 646 | Earth point 2, on bulkhead |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D75 | Positive connection 2 (30), in engine compartment wiring harness |
| D101 | Connection 1, in engine compartment wiring harness |
| D120 | Connection 18, in engine compartment wiring harness |
| D123 | Connection 21, in engine compartment wiring harness |
| D144 | Positive connection 5 (30), in engine compartment wiring harness |
| * | from May 2003 |
| J17 | Fuel pump relay |
| J49 | Electric fuel pump 2 relay |
| J220 | Motronic control unit |
| J519 | Onboard supply control unit |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T10c | 10-pin connector, pink, electronics box engine compartment |
| T121a | 121-pin connector, on engine control unit |
| 18 | Earth point, on engine block |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 132 | Earth connection -3-, in engine compartment wiring harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D101 | Connection 1, in engine compartment wiring harness |
| D102 | Connection 2, in engine compartment wiring harness |
| D124 | Connection 22, in engine compartment wiring harness |
| J220 | Motronic control unit |
| N323 | Ignition coil -5- with output stage |
| N324 | Ignition coil -6- with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T6ma | 6-pin connector, white, electronics box engine compartment |
| T121a | 121-pin connector, on engine control unit |
| 167 | Earth connection -4-, in engine compartment wiring harness |
| 201 | Earth connection -5-, in engine compartment wiring harness |
| 209 | Earth connection -6-, in engine compartment wiring harness |
| D102 | Connection 2, in engine compartment wiring harness |
| D107 | Connection 5, in engine compartment wiring harness |
| J220 | Motronic control unit |
| N325 | Ignition coil 7 with output stage |
| N326 | Ignition coil 8 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T10k | 10-pin connector, black, coupling point engine wiring harness, near engine control unit |
| T121a | 121-pin connector, on engine control unit |
| 18 | Earth point, on engine block |
| 167 | Earth connection 4, in engine compartment wiring harness |
| 201 | Earth connection 5, in engine compartment wiring harness |
| D107 | Connection 5, in engine compartment wiring harness |
| * | is dropped from May 2005 |
| J220 | Motronic control unit |
| N112 | Secondary air inlet valve |
| N156 | Variable intake manifold change-over valve |
| N205 | Inlet camshaft control valve 1 |
| N208 | Inlet camshaft control valve 2 |
| N261 | Variable intake manifold change-over valve 2 |
| T6ma | 6-pin connector, white, electronics box engine compartment |
| T10k | 10-pin connector, black |
| T10ma | 10-pin connector, black, electronics box engine compartment |
| T121a | 121-pin connector, on engine control unit |
| E30 | Connection (87a), in engine wiring harness |
| D119 | Connection 17, in engine compartment wiring harness |
| G39 | Lambda probe upstream of catalytic converter bank 1 |
| G108 | Lambda probe II, upstream of catalytic converter bank 2 |
| J220 | Motronic control unit |
| T6b | 6-pin connector, black |
| T6c | 6-pin connector, green |
| T121a | 121-pin connector, on engine control unit |
| 363 | Earth connection -8-, in engine compartment wiring harness |
| 417 | Earth connection -9-, in engine compartment wiring harness |
| D117 | Connection 15, in engine compartment wiring harness |
| G130 | Lambda probe after catalytic converter, bank 1 |
| G131 | Lambda probe 2 after catalytic converter, bank 2 |
| J220 | Motronic control unit |
| T4b | 4-pin connector, black |
| T4c | 4-pin connector, green |
| T121a | 121-pin connector, on engine control unit |
| 317 | Earth connection -7-, in engine compartment wiring harness |
| 417 | Earth connection -9-, in engine compartment wiring harness |
| 418 | Earth connection -10-, in engine compartment wiring harness |
| 646 | Earth point 2, bulkhead |
| D116 | Connection 14, in engine compartment wiring harness |
| F | Brake light switch |
| F47 | Cruise control system brake pedal switch/diesel direct injection system |
| G42 | Intake air temperature sender |
| G70 | Air mass meter, bank 1 |
| G246 | Air mass meter 2, bank 2 |
| J220 | Motronic control unit |
| SB26 | Fuse 26 on fuse holder B |
| SB38 | Fuse 38 on fuse holder B |
| T10c | 10-pin connector, pink, electronics box engine compartment |
| T10d | 10-pin connector, blue, electronics box engine compartment |
| T10k | 10-pin connector, black, coupling point engine wiring harness, near engine control unit |
| T121a | 121-pin connector, on engine control unit |
| B278 | Positive connection 2 (15a), in main wiring harness |
| B289 | Positive connection 13 (15a), in main wiring harness |
| B335 | Connection 1 (54), in main wiring harness |
| D124 | Connection 22, in engine compartment wiring harness |
| D125 | Connection 23, in engine compartment wiring harness |
| D126 | Connection 24, in engine compartment wiring harness |
| * | from May 2005 |
| G79 | Accelerator position sender |
| G83 | Radiator outlet coolant temperature sender |
| G185 | Accelerator position sender 2 |
| J151 | Continued coolant circulation relay |
| J220 | Motronic control unit |
| J299 | Secondary air pump relay |
| T6t | 6-pin connector |
| T10e | 10-pin connector, green, electronics box engine compartment |
| T121a | 121-pin connector, on engine control unit |
| V36 | Water pump |
| V55 | Circulation pump |
| V101 | Secondary air pump motor |
| 614 | Earth point 2, on right in engine compartment |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
| * | only models without auxiliary heater |
| ** | only models with auxiliary heater |
| *** | from May 2005 |
| 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 |
| J527 | Steering column electronics control unit |
| J569 | Brake servo relay |
| T6ma | 6-pin connector, white, electronics box engine compartment |
| T10d | 10-pin connector, blue, electronics box engine compartment |
| T16a | 16-pin connector, steering column |
| T121a | 121-pin connector, on engine control unit |
| V192 | Vacuum pump for brakes |
| 614 | Earth point 2, on right in engine compartment |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
| G65 | High pressure sender |
| J220 | Motronic control unit |
| J255 | Climatronic control unit |
| J293 | Radiator fan control unit |
| J671 | Radiator fan control unit -2- |
| N80 | Activated charcoal filter system solenoid valve 1 (pulsed) |
| T10d | 10-pin connector, blue, electronics box engine compartment |
| T10ma | 10-pin connector, black, electronics box engine compartment |
| V7 | Radiator fan |
| V177 | Radiator fan 2 |
| T121a | 121-pin connector, on engine control unit |
| 12 | Earth point, on left in engine compartment |
| D108 | Connection 6, in engine compartment wiring harness |
| D122 | Connection 20, in engine compartment wiring harness |
| E7 | Connection (87a), in Motronic wiring harness |
| G266 | Oil level and oil temperature sender |
| J220 | Motronic control unit |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| N280 | Air conditioning system compressor regulating valve |
| T10d | 10-pin connector, blue, electronics box engine compartment |
| T10f | 10-pin connector, red, electronics box engine compartment |
| T16b | 16-pin connector, self-diagnosis connection, driver footwell |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| T121a | 121-pin connector, on engine control unit |
| 32 | Earth point, on left behind dash panel insert |
| B385 | Connection 3 (drive train CAN bus, high), in main wiring harness |
| B392 | Connection 3 (drive train CAN bus, low), in main wiring harness |
| B444 | Connection 1 (diagnosis), in main wiring harness |
| B509 | Connection 3 (diagnosis), in main wiring harness |
| D108 | Connection 6, in engine compartment wiring harness |
| * | is dropped from May 2005 |
| F1 | Oil pressure switch |
| G | Fuel gauge sender |
| G6 | Fuel pump (pre-supply pump) |
| G23 | Fuel pump |
| G32 | Coolant shortage indicator sender |
| G237 | Fuel gauge sender 3 |
| J285 | Control unit with display in dash panel insert |
| T4af | 4-pin connector, left tank connection |
| T5k | 5-pin connector, right tank connection |
| T10f | 10-pin connector, red, electronics box engine compartment |
| T32a | 32-pin connector, blue, on dash panel insert |
| 39 | Earth point, under rear left seat |
| 410 | Earth connection 1 (sender earth), in main wiring harness |
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