| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J4 | Dual tone horn relay |
| J59 | X-contact relief relay |
| 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 |
| T4g | 4-pin connector, in engine compartment, near alternator |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| 42 | Earth point, next to steering column |
| 81 | Earth connection 1, in dash panel wiring harness |
| 135 | Earth connection 2, in dash panel wiring harness |
| 500 | Screw connection 1 (30), on relay plate |
| 502 | Screw connection 1 (30a), on relay plate |
| D | Ignition/starter switch |
| J248 | Diesel direct injection system control unit |
| J317 | Terminal 30 voltage supply relay |
| Q6 | Glow plugs - (engine) |
| S10 | Fuse in relay plate fuse holder |
| S229 | Fuse in fuse holder |
| T2e | 2-pin connector, in engine compartment |
| T6 | 6-pin connector, brown, 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 |
| T121 | 121-pin connector |
| 501 | Screw connection 2 (30), on relay plate |
| 504 | Screw connection 1 (87), on relay plate |
| A2 | Positive connection (15), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A34 | Connection (75x), in dash panel wiring harness |
| A40 | Positive connection 1 (30), in dash panel wiring harness |
| A52 | Positive connection 2 (30), in dash panel wiring harness |
| A104 | Positive connection 2 (15), in dash panel wiring harness |
| F8 | Kick-down switch |
| F60 | Idling speed switch |
| G28 | Engine speed sender |
| G79 | Accelerator position sender |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| J52 | Glow plug relay |
| T3a | 3-pin connector, on front of engine |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T6i | 6-pin connector, on accelerator position sender |
| T10h | 10-pin connector, blue, coupling station on electronics box, on left in plenum chamber |
| T121 | 121-pin connector |
| 200 | Earth connection (screening), in engine compartment wiring harness |
| D74 | Connection (86), in engine compartment wiring harness |
| G2 | Coolant temperature sender |
| G62 | Coolant temperature sender |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| J248 | Diesel direct injection system control unit |
| N79 | Heater element for crankcase breather |
| T2b | 2-pin connector, in engine compartment |
| 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 |
| T121 | 121-pin connector |
| 10 | Earth point, in plenum chamber |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| * | Radiator fan relay connection |
| ** | connection air conditioning system |
| J104 | ABS control unit with EDL |
| J248 | Diesel direct injection system control unit |
| 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 |
| T47 | 47-pin connector, on ABS control unit with EDL/ ASR/ ESP |
| T121 | 121-pin connector |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| G40 | Hall sender |
| J248 | Diesel direct injection system control unit |
| N240 | Unit injector valve, No. 1 cyl. |
| N241 | Unit injector valve, No. 2 cyl. |
| N242 | Unit injector valve, No. 3 cyl. |
| N243 | Unit injector valve, No. 4 cyl. |
| T3e | 3-pin connector, black, on front of engine |
| T8u | 8-pin connector, in engine compartment |
| T121 | 121-pin connector |
| D101 | Connection 1, in engine compartment wiring harness |
| G70 | Air mass meter |
| G81 | Fuel temperature sender |
| J248 | Diesel direct injection system control unit |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N239 | Variable intake manifold flap change-over valve |
| T6o | 6-pin connector, in engine compartment |
| T10d | 10-pin connector, white, coupling station on electronics box, on left in plenum chamber |
| T121 | 121-pin connector |
| E30 | Connection (87a), in engine wiring harness |
| E45 | Cruise control system switch |
| E227 | Cruise control system (CCS) SET button |
| F36 | Clutch pedal switch |
| J248 | Diesel direct injection system control unit |
| 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 |
| T10e | 10-pin connector, black, coupling station on electronics box, on left in plenum chamber |
| T10s | 10-pin connector, next to steering column |
| T121 | 121-pin connector |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A100 | Connection 2 (87), in dash panel wiring harness |
| * | only models with GND |
| F | Brake light switch |
| F47 | Cruise control system brake pedal switch/diesel direct injection system |
| J248 | Diesel direct injection system control unit |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| Q7 | Glow plugs, coolant |
| S13 | Fuse in relay plate fuse holder |
| T6 | 6-pin connector, brown, 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 |
| 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 | Connection 2 (87), in dash panel wiring harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D98 | Connection (glow plugs), in engine compartment wiring harness |
| L32 | Connection 1, in heater wiring harness |
| * | only models with heat output for radiator fan |
| G | Fuel gauge sender |
| G6 | Fuel pump (pre-supply pump) |
| G32 | Coolant shortage indicator sender |
| J17 | Fuel pump relay |
| S228 | Fuse in fuse holder |
| S232 | Fuse in fuse holder |
| S234 | Fuse in fuse holder |
| S243 | Fuse in fuse holder |
| T6 | 6-pin connector, brown, coupling station on electronics box, on left in plenum chamber |
| T14 | 14-pin connector, in engine compartment |
| 42 | Earth point, next to steering column |
| 81 | Earth connection 1, in dash panel wiring harness |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| A101 | Connection 3 (87), in dash panel wiring harness |
| A151 | Connection 4 (87), in dash panel wiring harness |
| A152 | Connection 5 (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) |
| G266 | Oil level and oil temperature sender |
| J285 | Control unit with display in dash panel insert |
| K3 | Oil pressure warning lamp |
| K38 | Oil level warning lamp |
| S5 | Fuse in relay plate fuse holder |
| S7 | Fuse in relay plate fuse holder |
| T14 | 14-pin connector, in engine compartment |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 10 | Earth point, in plenum chamber |
| A20 | Connection (15a), in dash panel wiring harness |
| A38 | Positive connection -2- (15a), in dash panel wiring harness |
| * | only extended servicing intervals (ESI) |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G5 | Rev. counter |
| G21 | Speedometer |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface |
| K2 | Alternator warning lamp |
| K28 | Coolant temperature/coolant shortage warning lamp |
| K29 | Glow period 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 |
| * | output for signal earth |
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