| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J207 | Starter inhibitor relay |
| T2v | 2-pin connector, black |
| 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 plate |
| A17 | Connection (61), in dash panel wiring harness |
| * | Only models with automatic gearbox |
| J248 | Diesel direct injection system control unit |
| J399 | Injection pump control unit |
| Q10 | Glow plug 1 |
| Q11 | Glow plug 2 |
| Q12 | Glow plug 3 |
| Q13 | Glow plug 4 |
| Q14 | Glow plug 5 |
| Q15 | Glow plug 6 |
| S102 | Engine control unit fuse |
| S125 | Glow plug fuse |
| S189 | Glow plug fuse 2 |
| T9x | 9-pin connector, on injection pump control unit |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| 504 | Screw connection 1 (87), on relay plate |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| F28 | Connection 3, in diesel direct injection system wiring harness |
| F31 | Connection (engine glow plugs), in diesel direct injection system wiring harness |
| F34 | Connection 2 (engine glow plugs) in diesel direct injection system wiring harness |
| D | Ignition/starter switch |
| J248 | Diesel direct injection system control unit |
| J397 | Radiator fan run-on relay |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N144 | Left electrohydraulic engine mounting solenoid valve |
| N144 | Right electrohydraulic engine mounting solenoid valve |
| N239 | Variable intake manifold flap changeover valve * |
| N398 | Electrohydraulic engine mounting solenoid valve |
| T10e | 10-pin connector, orange, on protective housing for control units on left in engine compartment |
| T15k | 15-pin connector, grey |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| V157 | Intake manifold flap motor ** |
| A2 | Positive connection (15), in dash panel wiring harness |
| A15 | Positive connection (15), in instrument panel wiring harness |
| D101 | Connection 1, in engine compartment wiring harness |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| F26 | Connection 2, in diesel direct injection system wiring harness |
| * | Only models with engine code BAU |
| ** | Only models with engine code BAU or BDG |
| E45 | Cruise control system switch, position 0 = On, position 1 = Reinstate /accelerate, Position 2 = Off with memory, position 2a = Off with no memory |
| E227 | Cruise control system (CCS) SET button |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Cruise control system brake pedal switch/diesel direct injection system |
| J248 | Diesel direct injection system control unit |
| S13 | Fuse in relay plate fuse holder |
| T10 | 10-pin connector, black, next to steering column |
| T15a | 15-pin connector, white, on protective housing for control units on left in engine compartment |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| A15 | Positive connection (15), in instrument panel wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| A89 | Connection 2 (54), in dash panel wiring harness |
| A130 | Connection (cruise control system), in dash panel wiring harness |
| * | Only models with manual gearbox |
| --- | Only models with cruise control system (CCS) |
| F8 | Kickdown switch |
| F60 | Idling speed switch |
| G42 | Intake air temperature sender |
| G70 | Air mass meter |
| G79 | Accelerator position sender |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| S231 | Fuse in fuse holder |
| T6a | 6-pin connector, on injection pump |
| 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 |
| T15a | 15-pin connector, white, on protective housing for control units on left in engine compartment |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| A60 | Connection (speed signal), in dash panel wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| F35 | Connection 4, in diesel direct injection system wiring harness |
| * | Only models with manual gearbox |
| G28 | Engine speed sender |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| G80 | Needle lift sender |
| J248 | Diesel direct injection system control unit |
| T2 | 2-pin connector, black |
| T3 | 3-pin connector, grey |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| 28 | Earth point, on bulkhead |
| 156 | Earth connection, in diesel direct injection wiring harness |
| * | Only models with manual gearbox |
| E15 | Heated rear window switch |
| G2 | Coolant temperature sender |
| G8 | Oil temperature sender |
| G62 | Coolant temperature sender |
| G210 | Low fuel level sender |
| J28 | Air conditioning system and heater blocking diode |
| J248 | Diesel direct injection system control unit |
| J255 | Climatronic control unit |
| J314 | Air conditioning system cut-off control unit |
| T9k | 9-pin connector, green |
| 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 |
| T10v | 10-pin connector, light pink |
| T12 | 12-pin connector, black |
| T15s | 15-pin connector, red, on protective housing for control units on left in engine compartment |
| T16b | 16-pin connector, brown |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| A64 | Connection (30, speed boost), in dash panel wiring harness |
| * | Only models with Climatronic |
| ** | Only models with air conditioning system |
| J17 | Fuel pump relay |
| J248 | Diesel direct injection system control unit |
| J317 | Terminal 30 voltage supply relay |
| T3a | 3-pin connector, white, on protective housing for control units on left in engine compartment |
| T3s | 3-pin connector, 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 |
| T121 | 121-pin connector, on diesel direct injection system control unit |
| 501 | Screw connection 2 (30), on relay plate |
| A52 | Positive connection 2 (30), in dash panel wiring harness |
| A100 | Connection 2 (87), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| D10 | Positive connection (30), in front right wiring harness |
| F36 | Connection (87a), in diesel direct injection system wiring harness |
| G | Fuel gauge sender |
| G6 | Fuel pump (pressurisation pump) |
| G32 | Coolant shortage indicator sender |
| G169 | Fuel gauge sender 2 |
| G237 | Fuel gauge sender 3 |
| S228 | Fuse in fuse holder |
| T3d | 3-pin connector, black, front left in engine compartment |
| T4e | 4-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 |
| 78 | Earth point, lower part of right B-pillar |
| 197 | Earth connection 4, in rear wiring harness |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| 316 | Earth connection (sender earth 2), in engine wiring harness |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| J285 | Display control unit in dash panel insert |
| J533 | Data bus diagnostic interface |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature/coolant shortage warning lamp |
| K29 | Glow period warning lamp |
| K31 | Cruise control system warning lamp |
| K38 | Oil level warning lamp |
| K83 | Exhaust emissions warning lamp |
| L75 | Digital display illumination bulb |
| T16 | 16-pin connector, near handbrake lever, self-diagnosis connection |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| 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 and vermin repellent system contact switch |
| G22 | Speedometer sender (inductive sender on gearbox) |
| G266 | Oil level and oil temperature sender |
| H11 | Oil pressure warning buzzer |
| J285 | Control unit in dash panel insert |
| J393 | Convenience system central control unit |
| K | Dash panel insert |
| S5 | Fuses in fuse holder and relay plate |
| 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 |
| T10d | 10-pin connector, brown, on protective housing for control units on left in engine compartment |
| T15k | 15-pin connector, grey |
| T32a | 32-pin connector, blue |
| T32b | 32-pin connector, green |
| Y4 | Odometer display |
| 44 | Earth point, lower part of left A-pillar |
| 86 | Earth connection 1, in rear wiring harness |
| A74 | Connection (15a, fuse 5), in dash panel wiring harness |
| A91 | Connection (signal for dash panel insert), in dash panel wiring harness |
| * | Not for models with gearbox codes HEN, GMA, MSL |
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