| 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, on the 13 position additional relay carrier |
| S162 | Fuse 1 (30), in fuse holder on battery |
| S163 | Fuse 2 (30), in fuse holder on battery |
| S176 | Fuse 4 (30), in fuse holder on battery |
| S177 | Fuse 5 (30), in fuse holder on battery |
| T2e | 2-pin connector, near starter (in models without air conditioning system) |
| T4 | 4-pin connector, near starter (in models with air conditioning system) |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| 500 | Screw connection 1 (30), on relay plate |
| 502 | Screw connection (30a), on relay plate |
| * | only models with manual gearbox |
| --- | models with automatic gearbox only |
| D | Ignition/starter switch |
| J271 | Motronic current supply relay, in protective housing on left in engine compartment (control number 428) |
| S229 | Fuse 29 in fuse holder |
| S231 | Fuse 31 in fuse holder |
| S237 | Fuse 37 in fuse holder |
| T2 | 2-pin connector, in left engine compartment |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| 501 | Screw connection 2 (30), on relay plate |
| 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 |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
| * | from May 2003 |
| *** | up to April 2003 |
| --- | models with automatic gearbox only |
| J220 | Motronic control unit, in centre plenum chamber |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 2 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 |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| 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 harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| D78 | Positive connection 1 (30a), in engine compartment wiring harness |
| D173 | Connection (87), in engine wiring harness |
| J104 | ABS/ABS control unit with EDL |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit, in centre plenum chamber |
| T10w | 10-pin connector, white, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T47a | 47-pin connector, on ABS/ABS control unit with EDL/ ASR/ ESP |
| T68 | 68-pin connector, models with 4-speed automatic gearbox (AG4) |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| T121 | 121-pin connector |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 608 | Earth point, in centre of plenum chamber |
| 609 | Earth point, on right in plenum chamber |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| * | models with manual gearbox/automatic gearbox (AG4) only |
| --- | models with automatic gearbox only |
| G2 | Coolant temperature sender |
| G31 | Charge air pressure sender |
| G62 | Coolant temperature sender |
| G163 | Hall sender |
| J220 | Motronic control unit, in centre plenum chamber |
| N75 | Charge pressure control solenoid valve |
| N205 | Inlet camshaft control valve 1 |
| N249 | Turbocharger air recirculation valve |
| T4g | 4-pin connector |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T121 | 121-pin connector |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D101 | Connection 1, in engine wiring harness |
| D102 | Connection 2, in engine wiring harness |
| F88 | Power assisted steering pressure switch |
| G28 | Engine speed sender |
| G66 | Knock sensor 2 |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit, in centre plenum chamber |
| T3f | 3-pin connector, in front engine compartment |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T68 | 68-pin connector |
| T121 | 121-pin connector |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 139 | Earth connection (sender earth), in Motronic wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 608 | Earth point, in centre of plenum chamber |
| * | only models with manual gearbox |
| ** | connection air conditioning system |
| --- | models with automatic gearbox only |
| G130 | Lambda probe after catalytic converter |
| J220 | Motronic control unit, in centre plenum chamber |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| S232 | Fuse 32 in fuse holder |
| T4f | 4-pin connector, near catalytic converter |
| 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 |
| E30 | Connection (87a), in engine wiring harness |
| J220 | Motronic control unit, in centre plenum chamber |
| J542 | Brake servo control unit |
| S283 | Brake vacuum pump fuse, above the relay plate |
| T6k | 6-pin connector |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T10g | 10-pin connector, grey, in connector protective housing, on left in plenum chamber |
| T121 | 121-pin connector |
| V192 | Vacuum pump for brakes |
| B157 | Positive connection 3 (15a), in interior wiring harness |
| U8 | Positive connection (15a), in automatic gearbox wiring harness |
| * | from May 2003 |
| *** | up to April 2003 |
| --- | models with automatic gearbox only |
| F | Brake light switch |
| F47 | Cruise control system brake pedal switch |
| J220 | Motronic control unit, in centre plenum chamber |
| J299 | Secondary air pump relay, in protective housing on left in engine compartment (control number 100) |
| N112 | Secondary air inlet valve |
| S13 | Fuse 13 in fuse holder |
| T2f | 2-pin connector, in left engine compartment |
| T10e | 10-pin connector, black, in connector protective housing, on left in plenum chamber |
| T121 | 121-pin connector |
| V101 | Secondary air pump motor |
| A18 | Connection (54), in dash panel wiring harness |
| A20 | Connection (15a), in dash panel wiring harness |
| D103 | Connection 3, in engine compartment wiring harness |
| E45 | Cruise control system switch** |
| E227 | Cruise control system (CCS) SET button** |
| F36 | Clutch pedal switch |
| J220 | Motronic control unit, in centre plenum chamber |
| T4q | 4-pin connector |
| T10e | 10-pin connector, black, in connector protective housing, on left in plenum chamber |
| T10s | 10-pin connector, next to steering column |
| T10w | 10-pin connector, white, in connector protective housing, on left in plenum chamber |
| T121 | 121-pin connector |
| A20 | Connection (15a), in dash panel wiring harness |
| * | only models with manual gearbox |
| ** | only models with GND |
| G70 | Air mass meter |
| J17 | Fuel pump relay |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit, in centre plenum chamber |
| J234 | Airbag control unit |
| J255 | Climatronic control unit |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T10 | 10-pin connector, orange, in connector protective housing, on left in plenum chamber |
| T16b | 16-pin connector |
| T17a | 17-pin connector, behind centre dash panel |
| T75 | 75-pin connector |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| T121 | 121-pin connector |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| * | only models with manual gearbox |
| --- | models with automatic gearbox only |
| -●●- | only models with Climatronic |
| G | Fuel gauge sender |
| G6 | Fuel pump |
| G32 | Coolant shortage indicator sender |
| S228 | Fuse 28 in fuse holder |
| S234 | Fuse 34 in fuse holder |
| S243 | Fuse 43 in fuse holder |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| 42 | Earth point, next to steering column |
| 49 | Earth point, on 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 (87), 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 |
| * | from May 2003 |
| *** | up to April 2003 |
| --- | models with automatic gearbox only |
| ** | only models without Climatronic |
| F1 | Oil pressure switch |
| G22 | Speedometer sender, on gearbox |
| G266 | Oil level and oil temperature sender** |
| J217 | Automatic gearbox control unit |
| J285 | Control unit in dash panel insert |
| K3 | Oil pressure warning lamp |
| K38 | Oil level warning lamp** |
| S5 | Fuse 5 in fuse holder |
| S7 | Fuse 7 in fuse holder |
| T10h | 10-pin connector, blue, in connector protective housing, on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T32 | 32-pin connector, blue |
| T32a | 32-pin connector, green |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| B163 | Positive connection 1 (15), in interior wiring harness |
| * | models with manual gearbox/automatic gearbox (AG4) only |
| ** | only flexible service interval display |
| -●●- | models with 5-speed automatic gearbox (AG5) only |
| E86 | Multifunction display call-up button |
| E109 | Multifunction display memory switch |
| G17 | Ambient temperature sensor |
| J119 | Multifunction display |
| J255 | Climatronic control unit |
| J285 | Control unit 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 | Electric power control fault lamp |
| T6e | 6-pin connector |
| T12a | 12-pin connector, behind centre dash panel |
| T16 | 16-pin connector, in centre dash panel, 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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