| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J59 | X contact relief relay |
| J226 | Starter inhibitor and reversing light relay |
| S163 | Fuse -2- (30), in fuse box/battery |
| S176 | Fuse -4- (30), in fuse box/battery |
| S177 | Fuse -5- (30), in fuse box/battery |
| T2e | 2-pin connector, near starter (only models without air conditioner) |
| T4 | 4-pin connector, near starter (only models with air conditioner) |
| T6 | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T10w | 10-pin connector, white, in protective housing for connectors, on left in plenum chamber |
| 500 | Screw connection -1- (30), on relay plate |
| 502 | Screw connection -1- (30a), on relay plate |
| * | Only models with manual gearbox |
| --- | Only models with automatic gearbox |
| D | Ignition and starter switch |
| J448 | 4AV/4CV control unit, injection system, in centre of plenum chamber |
| N79 | Crankcase breather heater element |
| S229 | Fuse 29 in fuse holder |
| S237 | Fuse 37 in fuse holder |
| T6 | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T121 | 121-pin connector |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 501 | Screw connection 2 (30), on relay plate |
| 608 | Earth point, in centre of plenum chamber |
| A2 | Positive connection (15), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A98 | Positive connection 4 (30), in dash panel wiring harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| * | From May 2003 |
| *** | Up to April 2003 |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plugs |
| T4a | 4-pin connector |
| T4b | 4-pin connector |
| T4c | 4-pin connector |
| T4d | 4-pin connector |
| T121 | 121-pin connector |
| 15 | Earth point, on cylinder head |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 281 | Earth connection -1-, in engine prewiring wiring harness |
| D52 | Positive (+) connection (15a), in engine compartment wiring harness |
| G2 | Coolant temperature sender |
| G28 | Engine speed sender |
| G62 | Coolant temperature sender |
| G186 | Throttle valve drive (electric throttle operation) |
| G187 | Throttle valve drive angle sender -1- (electric throttle operation) |
| G188 | Throttle valve drive angle sender -2- (electric throttle operation) |
| J338 | Throttle valve control unit |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| T3 | 3-pin connector, on engine front |
| T6a | 6-pin connector |
| T14a | 14-pin connector, near battery |
| T121 | 121-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| G40 | Hall sender |
| G42 | Intake air temperature sender |
| G71 | Intake manifold pressure sender |
| G212 | Exhaust gas recirculation potentiometer |
| J217 | Automatic gearbox control unit |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| N18 | Exhaust gas recirculation valve |
| T3b | 3-pin connector, on cylinder head |
| T6d | 6-pin connector |
| T10 | 10-pin connector, orange, in protective housing for connectors, on left in plenum chamber |
| T10e | 10-pin connector, black, in protective housing for connectors, on left in plenum chamber |
| T68 | 68-pin connector |
| T121 | 121-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| * | Only models with manual gearbox |
| ** | Connection for air conditioner |
| *** | Connection for radiator fan control unit |
| --- | Only models with automatic gearbox |
| J104 | ABS/ABS with EDL control unit |
| J217 | Automatic gearbox control unit |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| T10w | 10-pin connector, white, in protective housing for connectors, on left in plenum chamber |
| T47a | 47-pin connector, ABS with EDL/TCS/ESP control unit |
| T68 | 68-pin connector |
| T121 | 121-pin connector |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 608 | Earth point, in plenum chamber, centre |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| --- | Only models with automatic gearbox |
| G61 | Knock sensor I |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| S232 | Fuse in fuse box |
| T2 | 2-pin connector, on cylinder head, left |
| T10 | 10-pin connector, orange, in protective housing for connectors, in plenum chamber, left |
| T14a | 14-pin connector, near battery |
| T121 | 121-pin connector |
| A101 | Connection -3- (87), in dash panel wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| D102 | Connection -2-, in engine compartment wiring harness |
| G39 | Lambda probe |
| G79 | Accelerator pedal position sender |
| G185 | Accelerator pedal position sender -2- |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| T6b | 6-pin connector |
| T6c | 6-pin connector, near catalyst |
| T10h | 10-pin connector, blue, in protective housing for connectors, on left in plenum chamber |
| T121 | 121-pin connector |
| E30 | Connection (87a), in engine wiring harness |
| E45 | Cruise control system switch** |
| E227 | Cruise control system (CCS) button (Set)** |
| F | Brake light switch |
| F36 | Clutch pedal switch** |
| F47 | Cruise control system brake pedal switch |
| J448 | 4LV control unit (injection system), in plenum chamber, centre |
| S13 | Fuse in fuse box |
| T4q | 4-pin connector |
| T10e | 10-pin connector, black, in protective housing for connectors, on left in plenum chamber |
| T10s | 10-pin connector, next to steering column |
| T10w | 10-pin connector, white, in protective housing for connectors, on left in plenum chamber |
| T121 | 121-pin connector |
| A18 | Connection (54), in dash panel wiring harness |
| A20 | Connection (15a), in dash panel wiring harness |
| * | Only models with manual gearbox |
| ** | Only models with CCS |
| G130 | Lambda probe after catalytic converter |
| J17 | Fuel pump relay |
| J234 | Airbag control unit |
| J255 | Climatronic control unit |
| J448 | 4AV/4CV control unit, injection system, in centre of plenum chamber |
| N80 | Active charcoal filter system solenoid valve 1 |
| T4e | 4-pin connector, near catalytic converter |
| T6 | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T10 | 10-pin connector, orange, in protective housing for connectors on left in plenum chamber |
| T16b | 16-pin connector |
| T17a | 17-pin connector, in centre behind dash panel |
| T75 | 75-pin connector |
| T121 | 121-pin connector |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| -••- | Applies only to models fitted with Climatronic |
| G | Fuel gauge sender |
| G6 | Fuel pump |
| G32 | Coolant shortage indicator sender |
| S228 | Fuse 28 in fuse box |
| S234 | Fuse in fuse box |
| S243 | Fuse 43 in fuse box |
| T6 | 6-pin connector, brown, in protective housing for connectors, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| 42 | Earth point, next to steering column |
| 49 | Earth point, next to steering column |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 504 | Screw connection -1- (87F), on relay plate |
| A99 | Connection -1- (87), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| *** | Only models without Climatronic |
| F1 | Oil pressure switch |
| G22 | Speedometer sender, on gearbox |
| G266 | Oil level and oil temperature sender* |
| J285 | Control unit in dash panel insert |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature and coolant shortage warning lamp |
| K38 | Oil level warning lamp* |
| S5 | Fuse 5 in fuse holder |
| S7 | Fuse 7 in fuse holder |
| T14a | 14-pin connector, in cable channel on left in engine compartment |
| T32 | 32-pin connector, blue |
| T32a | 32-pin connector, green |
| B163 | Positive connection 1 (15), in interior wiring harness |
| D25 | Positive connection (15), in engine pre-wiring harness |
| * | Applies only with flexible service interval display |
| E86 | Multi-function display call-up button |
| E109 | Multi-function display, memory switch |
| G17 | Ambient temperature sensor |
| J119 | Multi-function display |
| J255 | Climatronic control unit |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface, in dash panel insert |
| K31 | Cruise control system warning lamp |
| K83 | Exhaust emissions warning lamp |
| K132 | Electronic power control fault lamp |
| T6e | 6-pin connector |
| T12a | 12-pin connector, behind dash panel, centre |
| T16 | 16-pin connector, in dash panel centre, self-diagnosis connection |
| T20 | 20-pin connector |
| T32 | 32-pin connector, blue |
| T32a | 32-pin connector, green |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| *** | Only models without Climatronic |
| -•- | Only models with Climatronic |
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