| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J518 | Entry and start authorisation control unit |
| J682 | Terminal 50 voltage supply relay |
| T6ma | 6-pin connector, white, E-box in engine compartment |
| T10c | 10-pin connector, pink, E-box in engine compartment |
| T10d | 10-pin connector, blue, E-box in engine compartment |
| T10f | 10-pin connector, red, E-box in front of engine compartment |
| T10m | 10-pin connector, black, E-box in engine compartment |
| T81 | 81-pin connector |
| TV2 | Terminal 30 junction |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D75 | Positive connection -2- (30), in engine compartment wiring harness |
| D108 | Connection -6-, in engine compartment wiring harness |
| J52 | Glow plug relay |
| J317 | Terminal 30 voltage supply relay |
| J623 | Engine control unit |
| Q10 | Glow plug -1- |
| Q11 | Glow plug -2- |
| Q12 | Glow plug -3- |
| Q13 | Glow plug -4- |
| Q14 | Glow plug -5- |
| S1 | Fuse in relay plate fuse holder, in engine compartment |
| S2 | Fuse in relay plate fuse holder, in engine compartment |
| S3 | Fuse in relay plate fuse holder, in engine compartment |
| S9 | Fuse in relay plate fuse holder, in engine compartment |
| S10 | Fuse in relay plate fuse holder, in engine compartment |
| S11 | Fuse in relay plate fuse holder, in engine compartment |
| S12 | Fuse in relay plate fuse holder, in engine compartment |
| S13 | Fuse in relay plate fuse holder, in engine compartment |
| T5mg | 5-pin connector, black, on front left of engine |
| T94aa | 94-pin connector |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D75 | Positive connection -2- (30), in engine compartment wiring harness |
| D98 | Connection (glow plugs), in engine compartment wiring harness |
| D103 | Connection -3-, in engine compartment wiring harness |
| D109 | Connection -7-, in engine compartment wiring harness |
| D113 | Connection -11-, in engine compartment wiring harness |
| J496 | Additional coolant pump relay |
| J623 | Engine control unit |
| J708 | Residual heat relay |
| 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. |
| N244 | Unit injector valve, No. 5 cyl. |
| T6k | 6-pin connector, brown |
| T6mp | 6-pin connector |
| T10ma | 10-pin connector, black, E-box in engine compartment |
| T60aa | 60-pin connector |
| T94aa | 94-pin connector |
| V55 | Circulation pump |
| D95 | Connection (injectors), in engine compartment wiring harness |
| D103 | Connection -3-, in engine compartment wiring harness |
| D114 | Connection -9-, in engine compartment wiring harness |
| E48 | Connection (injectors), in injection system wiring harness |
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Brake pedal switch for CCS/diesel direct injection system |
| G70 | Air mass meter |
| J623 | Engine control unit |
| SB26 | Fuse -26- on fuse holder |
| SB38 | Fuse -38- on fuse holder |
| T10c | 10-pin connector, pink, E-box in engine compartment |
| T10d | 10-pin connector, blue, E-box in engine compartment |
| T94aa | 94-pin connector |
| B278 | Positive connection -2- (15a), in main wiring harness |
| B289 | Positive connection -13- (15a), in main wiring harness |
| B335 | Connection -1- (54), in main wiring harness |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| * | Applies only to models with a manual gearbox |
| G65 | High pressure sender |
| J17 | Fuel pump relay |
| J519 | Onboard supply control unit |
| J623 | Engine control unit |
| J671 | Radiator fan control unit -2- |
| J715 | Fuel tank pre-supply relay |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N79 | Crankcase breather heater element |
| N239 | Variable intake manifold flap change-over valve |
| N345 | Exhaust gas recirculation cooler change-over valve |
| T6k | 6-pin connector, brown |
| T10c | 10-pin connector, pink, E-box in engine compartment |
| T10ma | 10-pin connector, black, E-box in engine compartment |
| T18 | 18-pin connector |
| T60aa | 60-pin connector |
| T94aa | 94-pin connector |
| V177 | Radiator fan -2- |
| 12 | Earth point, on left in engine compartment |
| 647 | Earth point -3-, bulkhead |
| D106 | Connection -4-, in engine compartment wiring harness |
| D122 | Connection -20-, in engine compartment wiring harness |
| D123 | Connection -21-, in engine compartment wiring harness |
| D129 | Connection -27-, in engine compartment wiring harness |
| * | Applies only to models with an auxiliary coolant heater |
| ** | Applies only to models with an automatic gearbox |
| G266 | Oil level/oil temperature sender |
| J255 | Climatronic control unit |
| J293 | Radiator fan control unit |
| J301 | Air conditioning system control unit |
| J445 | Fuel cooling pump relay |
| J623 | Engine control unit |
| N280 | Air conditioning system compressor regulating valve |
| T6ma | 6-pin connector, white, E-box in engine compartment |
| T10d | 10-pin connector, blue, E-box in engine compartment |
| T10f | 10-pin connector, red, E-box in engine compartment |
| T10ma | 10-pin connector, black, E-box in engine compartment |
| T94aa | 94-pin connector |
| V7 | Radiator fan |
| V166 | Fuel cooling pump |
| 12 | Earth point, on left in engine compartment |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 646 | Earth point -2-, bulkhead |
| B385 | Connection -3- (drive train CAN bus, high), in main wiring harness |
| B392 | Connection -3- (drive train CAN bus, low), in main wiring harness |
| B444 | Connection -1- (diagnosis), in main wiring harness |
| B509 | Connection -3- (diagnosis), in main wiring harness |
| D106 | Connection -4-, in engine compartment wiring harness |
| D123 | Connection -21-, in engine compartment wiring harness |
| F1 | Oil pressure switch |
| G | Fuel gauge sender |
| G6 | Fuel pump (pressurising pump) |
| G23 | Fuel pump |
| G32 | Coolant shortage indicator/warning sender |
| G237 | Fuel gauge sender -3- |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface |
| T4af | 4-pin connector |
| T5k | 5-pin connector |
| T10f | 10-pin connector, red, E-box in engine compartment |
| T16b | 16-pin connector, self-diagnosis connection, driver footwell |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| 39 | Earth point, under rear left seat bench |
| 410 | Earth connection -1-, (sender earth) in main wiring harness |
| B385 | Connection -3- (drive train CAN bus, high), in main wiring harness |
| B392 | Connection -3- (drive train CAN bus, low), in main wiring harness |
| B429 | Connection (EFPR), in main wiring harness |
| B444 | Connection -1- (diagnosis), in main wiring harness |
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