| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J519 | onboard power supply control unit |
| S162 | Fuse -1- (30), in fuse box/battery |
| S163 | Fuse -2- (30), in fuse box/battery |
| S176 | Fuse -4- (30), in battery fuse holder |
| S180 | Fuse -8- (30), in battery fuse holder |
| T1a | Single connector, on starter |
| T2bs | 2-pin connector, near dual tone horns |
| T2y | 2-pin connector, on alternator |
| T6q | 6-pin connector, blue, in engine compartment, left |
| T11d | 11-pin connector, white, in engine compartment, left |
| T18a | 18-pin connector, on onboard power supply control unit |
| 1 | Earth strap, battery-body |
| 507 | Screw connection (30), in fuse box/battery |
| 621 | Earth point, vehicle onboard power supply battery |
| D | Ignition/starter switch |
| E19 | Parking light switch |
| J519 | Onboard power supply control unit |
| SB10 | Fuse -10- on fuse holder |
| T8a | 8-pin connector, on ignition/starter switch |
| T18a | 18-pin connector, on onboard power supply control unit |
| T41a | 41-pin connector, on turn signal switch |
| B111 | Positive connection -1- (30a), in interior wiring harness |
| B165 | Positive connection -2- (15), in interior wiring harness |
| B491 | Positive connection (75), in interior wiring harness |
| B500 | Connection (86s), in interior wiring harness |
| B503 | Positive connection -7- (30a), in interior wiring harness |
| J519 | onboard power supply control unit |
| J533 | Data bus diagnostic interface |
| SB26 | Fuse -26- on fuse holder |
| SB29 | Fuse -29- on fuse holder |
| T3c | 3-pin connector, (grey) in engine compartment, left |
| T16a | 16-pin connector, on onboard power supply control unit |
| T16b | 16-pin connector, near relay station |
| T18a | 18-pin connector, on onboard power supply control unit |
| TV3 | Terminal 30a wiring junction |
| 284 | Earth connection -6-, in interior wiring harness |
| B150 | Positive connection -2- (30a), in interior wiring harness |
| B159 | Connection (diagnosis), in interior wiring harness |
| B231 | Positive connection -5- (30a), in interior wiring harness |
| G40 | Hall sender |
| G62 | Coolant temperature sender |
| G81 | Fuel temperature sender |
| J248 | Diesel direct injection system control unit |
| J519 | Onboard power supply control unit |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N239 | Variable intake manifold flap change-over valve |
| T2bp | 2-pin connector, on fuel temperature sender |
| T2z | 2-pin connector, on coolant temperature sender |
| T3g | 3-pin connector, on hall sender |
| T6ap | 6-pin connector, on charge pressure control solenoid valve |
| T11b | 11-pin connector, red, in engine compartment, left |
| T14a | 14-pin connector, in engine compartment, left |
| T40a | 40-pin connector, on diesel direct injection system control unit |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| D180 | Connection (87a), in engine compartment wiring harness |
| E22 | Intermittent wiper switch |
| G70 | Air mass meter |
| J248 | Diesel direct injection system control unit |
| J519 | Onboard power supply 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. |
| SB16 | Fuse -16- on fuse holder |
| SB17 | Fuse -17- on fuse holder |
| T5m | 5-pin connector, on air mass meter |
| T8n | 8-pin connector, on unit injector valve, No. 1 cyl. |
| T11b | 11-pin connector, red, in engine compartment, left |
| T40a | 40-pin connector, on diesel direct injection system control unit |
| T41a | 41-pin connector, on turn signal switch |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| D52 | Positive connection (15a), in engine compartment wiring harness |
| F8 | Kick-down switch |
| F60 | Idling switch |
| F268 | Additional heating heater element contact switch |
| G42 | Intake air temperature sender |
| G71 | Intake manifold pressure sender |
| G79 | Accelerator pedal position sender |
| J248 | Diesel direct injection system control unit |
| J519 | Onboard power supply control unit |
| T4i | 4-pin connector, on intake manifold pressure sender |
| T6p | 6-pin connector, yellow, in engine compartment, left |
| T6q | 6-pin connector, blue, in engine compartment, left |
| T6z | 6-pin connector, on acelerator pedal position sender |
| T10a | 10-pin connector, behind dash panel, right |
| T11a | 11-pin connector, blue, in engine compartment, left |
| T16d | 16-pin connector, on additional heating heater element contact switch |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| F34 | Brake fluid level warning contact |
| G28 | Engine speed sender |
| J248 | Diesel direct injection system control unit |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| J519 | Onboard power supply control unit |
| T2t | 2-pin connector, on brake fluid level warning contact |
| T3h | 3-pin connector, in engine compartment, right |
| T6am | 6-pin connector, on high heat output relay |
| T9c | 9-pin connector, on low heat output relay |
| T11a | 11-pin connector, blue, in engine compartment, left |
| T11d | 11-pin connector, white, in engine compartment, left |
| T40a | 40-pin connector, on diesel direct injection system control unit |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| 13 | Earth point, on right in engine compartment |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| B151 | Positive connection -3- (30a), in interior wiring harness |
| E4 | Positive connection (15a), in KE III Jetronic wiring harness |
| 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 |
| J500 | Power steering control unit |
| J519 | Onboard power supply control unit |
| T4c | 4-pin connector, on cruise control system brake pedal switch (diesel direct injection system) |
| T4e | 4-pin connector, on power steering control unit |
| T4p | 4-pin connector, on clutch pedal switch |
| T6q | 6-pin connector, blue, in engine compartment, left |
| T11a | 11-pin connector, blue, in engine compartment, left |
| T11d | 11-pin connector, white, in engine compartment, left |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| B131 | Connection (54), in interior wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| B229 | Connection (high bus), in interior wiring harness |
| B230 | Connection (low bus), in interior wiring harness |
| D73 | Positive connection (54), in engine compartment wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| D159 | Connection (high bus), in engine compartment wiring harness |
| D160 | Connection (low bus), in engine compartment wiring harness |
| J17 | Fuel pump relay |
| J248 | Diesel direct injection system control unit |
| J322 | Diesel direct injection system relay |
| J519 | Onboard power supply control unit |
| SB4 | Fuse -4- on fuse holder |
| SB14 | Fuse -14- on fuse holder |
| SB40 | Fuse -40- on fuse holder |
| SB41 | Fuse -41- on fuse holder |
| T3c | 3-pin connector, (grey) in engine compartment, left |
| T6l | 6-pin connector, on fuel pump relay |
| T6p | 6-pin connector, yellow, in engine compartment, left |
| T9b | 9-pin connector, on diesel direct injection system relay |
| T11b | 11-pin connector, red, in engine compartment, left |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| B146 | Positive connection -1- (87), in interior wiring harness |
| B178 | Connection (speed signal), in interior wiring harness |
| D181 | Connection -2- (87a), in engine compartment wiring harness |
| E19 | Parking light switch |
| G22 | Speedometer sender (Hall sender on gearbox) |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| J285 | Control unit with display in dash panel insert |
| J519 | Onboard power supply control unit |
| K | Dash panel insert |
| T3i | 3-pin connector, on speedometer sender (Hall sender on gearbox) |
| T6an | 6-pin connector, on glow plug relay |
| T6m | 6-pin connector, in engine compartment, left |
| T11b | 11-pin connector, red, in engine compartment, left |
| T11d | 11-pin connector, white, in engine compartment, left |
| T14a | 14-pin connector, in engine compartment, left |
| T16a | 16-pin connector, on onboard power supply control unit |
| T18a | 18-pin connector, on vehicle voltage control unit |
| T32a | 32-pin connector, on dash panel insert |
| T81a | 81-pin connector, on 4MV (injection system) control unit |
| B146 | Positive connection -1- (87), in interior wiring harness |
| B163 | Positive connection -1- (15), in interior wiring harness |
| B492 | Positive connection -3- (15), in interior wiring harness |
| B514 | Positive connection -10- (30a), in interior wiring harness |
| D78 | Positive connection -1- (30a), in engine compartment wiring harness |
| F1 | Oil pressure switch |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G6 | Fuel pump (pre-supply pump) |
| J285 | Control unit with display in dash panel insert |
| J519 | Onboard power supply control unit |
| K | Dash panel insert |
| K3 | Oil pressure warning lamp |
| K29 | Glow period warning lamp |
| K105 | Reserve fuel warning lamp |
| T1i | Single connector, on oil pressure switch |
| T4a | 4-pin connector, under rear right seat |
| T11b | 11-pin connector, red, in engine compartment, left |
| T14a | 14-pin connector, in engine compartment, left |
| T32a | 32-pin connector, on dash panel insert |
| 401 | Earth connection (sender earth), in interior wiring harness |
| J519 | Onboard power supply control unit |
| Q6 | Glow plug - (engine) |
| S276 | Heater element fuse -1- |
| S277 | Heater element fuse -2- |
| S278 | Heater element fuse -3- |
| T2bv | 2-pin connector, on glow plug - (engine) |
| T3x | 3-pin connector, on additional heating heater element |
| T6m | 6-pin connector, in engine compartment, left |
| Z35 | Additional heating heater element |
| 42 | Earth point, next to steering column |
| 279 | Earth connection -5-, in interior wiring harness |
| 285 | Earth connection -7-, in interior wiring harness |
| 606 | Earth point, under the centre console, near gear stick |
| B515 | Positive connection -4- (87), in interior wiring harness |
| B516 | Positive connection -5- (87), in interior wiring harness |
| F18 | Radiator fan thermal switch |
| J293 | Radiator fan control unit |
| J519 | Onboard power supply control unit |
| T3e | 3-pin connector, in engine compartment, left |
| T3f | 3-pin connector, on radiator fan thermal switch |
| T3r | 3-pin connector, in engine compartment, left |
| T4r | 4-pin connector, on radiator fan control unit |
| T6k | 6-pin connector, on radiator fan control unit |
| T18a | 18-pin connector, on vehicle voltage control unit |
| V7 | Radiator fan |
| V35 | Radiator fan, right |
| 167 | Earth connection -4-, in engine compartment wiring harness |
| 238 | Earth connection -1-, in interior wiring harness |
| 249 | Earth connection -2-, in interior wiring harness |
| 278 | Earth connection -4-, in interior wiring harness |
| 606 | Earth point, under the centre console, near gear stick |
| D167 | Connection (fan stage I), in engine compartment wiring harness |
| D168 | Connection (fan stage II), in engine compartment wiring harness |
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