| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J226 | Starter inhibitor and reversing light relay, on 13 position additional relay carrier |
| S162 | Fuse 1 (30), in battery fuse holder |
| S163 | Fuse 2 (30), in battery fuse holder |
| S176 | Fuse 4 (30), in battery fuse holder |
| S177 | Fuse 5 (30), in battery fuse holder |
| T2e | 2-pin connector, near starter (on vehicles with no air conditioning system) |
| T4 | 4-pin connector, near starter (on vehicles with air conditioning system) |
| T6 | 6-pin connector, brown, in protective housing for connectors on left in plenum chamber |
| 42 | Earth point, next to steering column |
| 49 | Earth point, on steering column |
| 135 | Earth connection 2, in dash panel wiring harness |
| 500 | Screw connection 1 (30), on relay plat |
| * | Only models with manual gearbox |
| --- | Only models with automatic gearbox |
| ** | Only models with coolant heater glow plugs |
| D | Ignition/starter switch |
| Q6 | Glow plugs, engine |
| S229 | Fuse 29 in fuse holder |
| S237 | Fuse 37 in fuse holder |
| J4 | Dual tone horn relay |
| J59 | X-contact relief relay |
| J370 | Glow plug activation control unit, centre in plenum chamber |
| Q6 | Engine glow plug |
| T6 | 6-pin connector, brown, in protective housing for connectors on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T14c | 14-pin connector, on left in engine compartment |
| 501 | Screw connection 2 (30), on relay plat |
| 503 | Screw connection (75x), on relay plate |
| A2 | Positive connection (15), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A80 | Connection 1 (X), 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 |
| F8 | Kickdown switch |
| F60 | Idling speed switch |
| G79 | Accelerator position sender |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| J317 | Terminal 30 voltage supply relay, above the central electrics |
| T6 | 6-pin connector, brown, in protective housing for connectors on left in plenum chamber |
| T6a | 6-pin connector |
| T10h | 10-pin connector, blue, in protective housing for connectors on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| A98 | Positive connection 4 (30), in dash panel wiring harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| G2 | Coolant temperature display sender |
| G28 | Engine speed sender |
| G31 | Charge air pressure sender |
| G42 | Intake air temperature sender |
| G62 | Coolant temperature sender |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| T3 | 3-pin connector, on front of engine |
| T14a | 14-pin connector, near battery |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| 200 | Earth connection (screening) in engine compartment wiring harness*** |
| * | From August 2004 |
| *** | Up to July 2004 |
| J104 | ABS control unit |
| J217 | Automatic gearbox control unit |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| T10 | 10-pin connector, orange, 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 |
| T47a | 47-pin connector |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| T94 | 94-pin connector |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| D74 | Connection (86), in engine compartment wiring harness |
| * | Connection for radiator fan control unit/radiator fan relay |
| ** | Connection air conditioning system |
| --- | Only models with automatic gearbox |
| G40 | Hall sender |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| N240 | Unit injector valve, No. 1 cylinder |
| N241 | Unit injector valve, No. 2 cylinder |
| N242 | Unit injector valve, No. 3 cylinder |
| N243 | Unit injector valve, No. 4 cylinder |
| T3a | 3-pin connector, on front of engine |
| T8u | 8-pin connector, on left of cylinder head |
| T60 | 60-pin connector |
| D140 | Connection (injectors), in engine prewiring harness |
| E48 | Connection (injectors), in injection system wiring harness |
| G212 | Exhaust gas recirculation potentiometer |
| G500 | Turbocharger guide vane position sender |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| N18 | Exhaust gas recirculation valve |
| N79 | Crankcase breather heater element |
| T6d | 6-pin connector |
| T10f | 10-pin connector, in front of engine compartment |
| T14c | 14-pin connector, on left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 608 | Earth point, central in plenum chamber |
| D101 | Connection 1, in engine compartment wiring harness |
| *** | Only models with crankcase breather heater element |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| N75 | Charge pressure control solenoid valve |
| N156 | Variable intake manifold changeover valve |
| N345 | Exhaust gas recirculation cooler changeover valve |
| T10f | 10-pin connector, in front of engine compartment |
| T14c | 14-pin connector, on left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| V157 | Intake manifold flap motor |
| 131 | Earth connection 2, in engine compartment wiring harness |
| E29 | Connection, in engine wiring harness |
| E45 | Cruise control system switch** |
| E227 | Cruise control system (CCS) SET button** |
| F36 | Clutch pedal switch |
| G81 | Fuel temperature sender |
| J217 | Automatic gearbox control unit |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| J255 | Climatronic control unit |
| T4q | 4-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 |
| T10s | 10-pin connector, next to steering column |
| T16b | 16-pin connector |
| T17a | 17-pin connector, centre behind dash panel |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A155 | Connection 2 (86) in dash panel wiring harness |
| * | Only models with manual gearbox |
| ** | Only models with CCS |
| --- | Only models with automatic gearbox |
| -●●- | Only models with Climatronic |
| F | Brake light switch |
| F47 | Brake pedal switch |
| J248 | Diesel direct injection system control unit, centre in plenum chamber |
| J359 | Low heat output relay**, in protective housing on left in engine compartment (53) |
| J360 | High heat output relay**, in protective housing on left in engine compartment (100) |
| Q7 | Coolant heating element** |
| S13 | Fuse 13 in fuse holder |
| T10e | 10-pin connector, black, 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 |
| T94 | 94-pin connector |
| A18 | Connection (54), in dash panel wiring harness |
| A155 | Connection 2 (86) in dash panel wiring harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D98 | Connection (glow plugs), in engine compartment wiring harness |
| ** | Only models with coolant heater glow plugs |
| G | Fuel gauge sender |
| G6 | Fuel system pressurisation pump |
| J17 | Fuel pump relay, on additional relay carrier above relay plate |
| S228 | Fuse 28 in fuse holder |
| S232 | Fuse 32 in fuse holder |
| S234 | Fuse 34 in fuse holder |
| S243 | Fuse 43 in fuse holder |
| T6 | 6-pin connector, brown, in protective housing for connectors on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| A71 | Connection (86), in dash panel wiring harness |
| A100 | Connection 2 (87) in dash panel wiring harness |
| B168 | Connection (86), in interior wiring harness |
| * | Only models with multifunction display |
| *** | Only models with multifunction display and with no Climatronic |
| F1 | Oil pressure switch |
| G22 | Speedometer sender, on gearbox |
| G32 | Coolant shortage indicator sender |
| J217 | Automatic gearbox control unit |
| S5 | Fuse 5 in fuse holder |
| S7 | Fuse 7 in fuse holder |
| T10h | 10-pin connector, blue, in protective housing for connectors on left in plenum chamber |
| T14a | 14-pin connector, near battery |
| T68a | 68-pin connector, models with 5-speed automatic gearbox (AG5) |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| 608 | Earth point, centre in plenum chamber |
| A20 | Connection (15a), in dash panel wiring harness |
| B163 | Positive connection 1 (15), in interior wiring harness |
| * | Only models with manual gearbox |
| --- | Only models with automatic gearbox |
| E86 | Multifunction display call-up button |
| E109 | Multifunction display memory switch |
| G17 | Ambient temperature sensor |
| G21 | Speedometer |
| H3 | Buzzer |
| J119 | Multifunction display |
| J255 | Climatronic control unit |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnosis interface, in dash panel insert |
| K2 | Alternator warning lamp |
| K29 | Glow period warning lamp |
| K31 | Cruise control system warning lamp |
| T6e | 6-pin connector |
| T12a | 12-pin connector, centre behind dash panel |
| T16 | 16-pin connector, centre in dash panel, self-diagnosis connection |
| T20 | 20-pin connector |
| T32 | 32-pin connector, blue |
| T32a | 32-pin connector, green |
| A76 | Connection (K-diagnosis wire), in dash panel wiring harness |
| * | Only models with multifunction display |
| *** | Only models with multifunction display and with no Climatronic |
| -●- | Only models with Climatronic |
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