| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| 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 |
| S229 | Fuse 29 in fuse holder |
| T4g | 4-pin connector, near starter |
| T6 | 6-pin connector, brown, in connector protective housing, on left in plenum chamber |
| 500 | Screw connection 1 (30), on relay plate |
| 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 |
| E30 | Positive connection (30), in dash panel wiring harness |
| F8 | Kick-down switch |
| F60 | Idling speed switch |
| G79 | Accelerator position sender |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit, in centre plenum chamber |
| Q6 | Glow plugs - engine |
| T2 | 2-pin connector |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T6a | 6-pin connector, behind left dash panel |
| T10 | 10-pin connector, orange, coupling station on electronics box, on left in plenum chamber |
| T10h | 10-pin connector, blue, in connector protective housing, on left in plenum chamber |
| T121 | 121-pin connector |
| 135 | Earth connection 2, in dash panel wiring harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| G2 | Coolant temperature display sender |
| G28 | Engine speed sender |
| G62 | Coolant temperature sender |
| G70 | Air mass meter |
| J217 | Automatic gearbox control unit, in centre plenum chamber |
| J248 | Diesel direct injection system control unit, in centre plenum chamber |
| T3 | 3-pin connector, on front of engine |
| T10 | 10-pin connector, orange, coupling station on electronics box, on left in plenum chamber |
| T10d | 10-pin connector, white, coupling station on electronics box, on left in plenum chamber |
| T10h | 10-pin connector, blue, coupling station on electronics box, on left in plenum chamber |
| T14 | 14-pin connector, in engine compartment |
| T68 | 68-pin connector, on automatic gearbox control unit |
| T121 | 121-pin connector |
| 200 | Earth connection (screening), in engine compartment wiring harness |
| * | compressor switch-off |
| ** | air conditioner "ready" connection |
| only automatic gearbox |
| G80 | Needle lift sender |
| G81 | Fuel temperature sender |
| G149 | Modulating piston movement sender |
| J104 | ABS/ABS control unit with EDL, in left engine compartment |
| J217 | Automatic gearbox control unit, in centre plenum chamber |
| J248 | Diesel direct injection system control unit, in centre plenum chamber |
| N146 | Metering adjuster |
| T2a | 2-pin connector, on front of engine |
| T10d | 10-pin connector, white, coupling station on electronics box, on left in plenum chamber |
| T10f | 10-pin connector, on front of engine |
| T25 | 25-pin connector |
| T68 | 68-pin connector, on automatic gearbox control unit |
| T121 | 121-pin connector |
| 200 | Earth connection (screening), in engine compartment wiring harness |
| A121 | Positive connection (high bus), in interior wiring harness |
| A122 | Positive connection (low bus), in engine compartment wiring harness |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| only automatic gearbox |
| J248 | Diesel direct injection system control unit, in centre plenum chamber |
| J317 | Terminal 30 voltage supply relay |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N108 | Commencement of injection valve |
| N109 | Fuel shut-off valve |
| N239 | Variable intake manifold flap change-over valve |
| S234 | Fuse 34 in fuse holder |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T10 | 10-pin connector, orange, coupling station on electronics box, on left in plenum chamber |
| T10f | 10-pin connector, on front of engine |
| T10h | 10-pin connector, blue, coupling station on electronics box, on left in plenum chamber |
| T14a | 14-pin connector, black, in engine compartment |
| T121 | 121-pin connector |
| B147 | Positive connection 2 (87), in interior wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| E45 | Cruise control system switch** |
| 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, in centre plenum chamber |
| S13 | Fuse 13 in fuse holder |
| T7 | 7-pin connector, next to steering column |
| T10d | 10-pin connector, white, coupling station on electronics box, on left in plenum chamber |
| T10e | 10-pin connector, black, coupling station on electronics box, on left in plenum chamber |
| T121 | 121-pin connector |
| A18 | Connection (54), in dash panel wiring harness |
| A100 | Positive connection 3 (87), in interior wiring harness |
| * | only models with manual gearbox |
| ** | only models with GND |
| J248 | Diesel direct injection system control unit, in centre plenum chamber |
| J359 | Low heat output relay, in protective housing on left in engine compartment |
| J360 | High heat output relay, in protective housing on left in engine compartment |
| Q7 | Glow plugs, coolant |
| T2b | 2-pin connector |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T10 | 10-pin connector, orange, coupling station on electronics box, on left in plenum chamber |
| T121 | 121-pin connector |
| 10 | Earth point, in plenum chamber |
| 156 | Earth connection, in diesel direct injection wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D74 | Connection (86), in engine compartment wiring harness |
| D98 | Connection (glow plugs), in engine compartment wiring harness |
| L32 | Connection 1, in heater wiring harness |
| * | only models with manual gearbox and heater elements |
| ** | only models with heater crankcase breather |
| G | Fuel gauge sender |
| G32 | Coolant shortage indicator sender |
| G266 | Oil level and oil temperature sender |
| S5 | Fuse 5 in fuse holder |
| S232 | Fuse 32 in fuse holder |
| S243 | Fuse 43 in fuse holder |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T14 | 14-pin connector, black, in engine compartment |
| 10 | Earth point, in plenum chamber |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| A20 | Connection (15a), in dash panel wiring harness |
| A99 | Connection 1 (87), in dash panel wiring harness |
| A100 | Connection 2 (87), in dash panel wiring harness |
| B147 | Positive connection 2 (87), in interior wiring harness |
| F1 | Oil pressure switch |
| G22 | Speedometer sender (Hall sender, on gearbox) |
| H11 | Oil pressure warning buzzer |
| J285 | Control unit with display in dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| K28 | Coolant temperature/coolant shortage warning lamp |
| K29 | Glow period warning lamp |
| S7 | Fuse 7 in fuse holder |
| T14 | 14-pin connector, black, in engine compartment |
| T32 | 32-pin connector, blue, on dash panel insert |
| 10 | Earth point, in plenum chamber |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface |
| K38 | Oil level warning lamp |
| K105 | Reserve fuel warning lamp |
| T16 | 16-pin connector, diagnostic connector |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
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