| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J207 | Starter inhibitor relay |
| T2b | 2-pin connector, black, on right on engine block |
| T3a | 3-pin connector, white, on protective housing for control units on left in engine compartment |
| T9 | 9-pin connector, black |
| T10b | 10-pin connector, black, on protective housing for control units on left in engine compartment |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| 1 | Earth strap, battery body |
| 500 | Screw connection 1 (30), on relay plat |
| A17 | Connection (61), in dash panel wiring harness |
| A52 | Positive connection 2 (30), in dash panel wiring harness |
| A98 | Positive connection 4 (30), in dash panel wiring harness |
| D10 | Positive connection (30) in front right wiring harness |
| D97 | Connection (50), in engine compartment right wiring harness |
| * | Only models with manual gearbox |
| --- | Only models with automatic gearbox |
| J17 | Fuel pump relay |
| J179 | Automatic glow period control unit, below expansion tank |
| J248 | Diesel direct injection system control unit |
| J317 | Terminal 30 voltage supply relay |
| S116 | Injector fuse |
| S125 | Glow plug fuse |
| T3s | 3-pin connector |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T94 | 94-pin connector |
| Q10 | Glow plug 1 |
| Q11 | Glow plug 2 |
| Q12 | Glow plug 3 |
| Q13 | Glow plug 4 |
| 28 | Earth point, on bulkhead |
| 156 | Earth connection, in diesel direct injection wiring harness |
| 501 | Screw connection 2 (30), on relay plat |
| A100 | Connection 2 (87) in dash panel wiring harness |
| D10 | Positive connection (30) in front right wiring harness |
| D97 | Connection (50), in engine compartment right wiring harness |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| F28 | Connection 3, in diesel direct injection system wiring harness |
| G40 | Hall sender |
| G504 | Fuel additive tank sender |
| J248 | Diesel direct injection system control unit |
| N75 | Charge pressure control solenoid valve |
| N79 | Heater element for crankcase breather |
| T6o | 6-pin connector, brown |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T15s | 15-pin connector, red, on protective housing for control units on left in engine compartment |
| T94 | 94-pin connector |
| V135 | Particulate filter additive pump |
| V157 | Intake manifold flap motor |
| 156 | Earth connection, in diesel direct injection wiring harness |
| A15 | Positive connection (15), in instrument panel wiring harness |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| * | not with all levels of equipment |
| E45 | Cruise control system switch, position 0 = OFF in detent, position 1 = OFF with button, position 2 = ON, position 3 = RES |
| E227 | Cruise control system (CCS) SET button |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Cruise control system brake pedal switch |
| J248 | Diesel direct injection system control unit |
| J397 | Radiator fan run-on relay |
| S13 | Fuse in relay plate fuse holder |
| T10 | 10-pin connector, black |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T15a | 15-pin connector, white, on protective housing for control units on left in engine compartment |
| T15k | 15-pin connector, grey |
| T94 | 94-pin connector |
| A15 | Positive connection (15), in instrument wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| A89 | Connection 2 (54) in dash panel wiring harness |
| A130 | Connection (CCS), in dash panel wiring harness |
| * | Only models with manual gearbox |
| --- | Only models with CCS |
| F8 | Kickdown switch |
| F60 | Idling speed switch |
| G28 | Engine speed sender |
| G70 | Air mass meter |
| G79 | Accelerator position sender |
| J248 | Diesel direct injection system control unit |
| S231 | Fuse in fuse holder |
| T3 | 3-pin connector, near engine speed sender |
| T6r | 6-pin connector, black |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| T15a | 15-pin connector, white, on protective housing for control units on left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| A70 | Connection (15a, fuse 231), in dash panel wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| F26 | Connection 2, in diesel direct injection system wiring harness |
| F27 | Connection (screening), in diesel direct injection wiring harness |
| * | Only models with manual gearbox |
| D | Ignition/starter switch |
| E15 | Heated rear window switch |
| G2 | Coolant temperature display sender |
| G62 | Coolant temperature sender |
| J248 | Diesel direct injection system control unit |
| 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 |
| T8x | 8-pin connector, near injection pump |
| T10b | 10-pin connector, black, on protective housing for control units on left in engine compartment |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T15s | 15-pin connector, red, on protective housing for control units on left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| A2 | Positive connection (15), in dash panel wiring harness |
| A64 | Connection (30, speed boost), in dash panel wiring harness |
| D95 | Connection (injectors), in engine compartment wiring harness |
| E48 | Connection (injectors), in injection system wiring harness |
| F268 | Auxiliary heating heater element contact switch |
| G31 | Charge air pressure sender |
| G42 | Intake air temperature sender |
| G81 | Fuel temperature sender |
| J248 | Diesel direct injection system control unit |
| J255 | Climatronic control unit |
| J314 | Air conditioning system cut-off control unit |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| N18 | Exhaust gas recirculation valve |
| G212 | Exhaust gas recirculation potentiometer |
| T15s | 15-pin connector, red, on protective housing for control units on left in engine compartment |
| T60 | 60-pin connector |
| T94 | 94-pin connector |
| * | Only models with auxiliary heater |
| ** | Only models with air conditioning system |
| G39 | Lambda probe |
| G450 | Exhaust gas pressure sensor 1 |
| G506 | Temperature sender before particulate filter |
| G235 | Temperature sender before turbocharger |
| J248 | Diesel direct injection system control unit |
| S73 | Lambda probe heating thermal fuse |
| T2dp | 2-pin connector, left bulkhead |
| T2dt | 2-pin connector, left bulkhead |
| T3dp | 3-pin connector, left bulkhead |
| T94 | 94-pin connector |
| Z19 | Lambda probe heater |
| G22 | Speedometer sender, on gearbox |
| G266 | Oil level and oil temperature sender |
| J248 | Diesel direct injection system control unit |
| J285 | Control unit in dash panel insert |
| K31 | Cruise control system warning lamp |
| K38 | Oil level warning lamp |
| S5 | Fuse in relay plate fuse holder |
| T10b | 10-pin connector, black, on protective housing for control units on left in engine compartment |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| T15s | 15-pin connector, red, on protective housing for control units on left in engine compartment |
| T16 | 16-pin connector, self-diagnosis connection |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| T94 | 94-pin connector |
| A60 | Connection (speed signal), in dash panel wiring harness |
| A74 | Connection (15a, fuse 5), in dash panel wiring harness |
| A76 | Connection (K-diagnosis wire), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| H11 | Oil pressure warning buzzer |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature and coolant shortage warning lamp |
| K29 | Glow period warning lamp |
| K231 | Diesel particulate filter warning lamp |
| L75 | Digital display illumination bulb |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| Y4 | Odometer display |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| F1 | Oil pressure switch |
| F120 | Anti-theft alarm system contact switch |
| G | Fuel gauge sender |
| G6 | Fuel system pressurisation pump |
| G32 | Coolant shortage indicator sender |
| J393 | Convenience system central control unit |
| S228 | Fuse in fuse holder |
| T3d | 3-pin connector |
| T6c | 6-pin connector, blue, left A-pillar coupling station |
| T10a | 10-pin connector, brown, left A-pillar coupling station |
| T10b | 10-pin connector, black, on protective housing for control units on left in engine compartment |
| T15k | 15-pin connector, grey |
| 44 | Earth point, lower part of left A-pillar |
| 78 | Earth point, lower part of right B-pillar |
| 86 | Earth connection 1, in rear wiring harness |
| 197 | Earth connection 4, in rear wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| A91 | Connection (signal for dash panel insert), in dash panel wiring harness |
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