| A | Battery |
| B | Starter |
| C | Alternator |
| D | Ignition/starter switch |
| S88 | Strip fuse |
| SB30 | Fuse -30- on fuse box |
| SB31 | Fuse -31- on fuse box |
| SB38 | Fuse -38- on fuse box |
| T17b | 17-pin connector, white, in footwell, front left |
| 65 | Earth point, left longitudinal member, rear, between B and C pillar |
| 500 | Screw connection -1- (30), on relay plate |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| B156 | Positive (+) connection (30a), in interior wiring harness |
| P2 | Positive (+) connection (30), in battery wiring harness |
| * | Only applies to models with fuel-burning additional heater |
| ** | Only applies to models with electric additional heater (PTC 900 W) |
| J52 | Glow plug relay |
| J248 | Diesel direct injection system control unit |
| J317 | Terminal 30 voltage supply relay |
| Q6 | Glow plugs (engine) |
| S39 | Strip fuse for glow plugs - engine |
| T17 | 17-pin connector, brown, in footwell, front left |
| T17e | 17-pin connector, blue, in footwell, front left |
| 44 | Earth point, lower part of left A pillar |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| 279 | Earth connection -5-, in interior wiring harness |
| 284 | Earth connection -6-, in interior wiring harness |
| D16 | Connection (glow plugs), in front right wiring harness |
| F31 | Connection (glow plugs - engine), in diesel direct injection system wiring harness |
| * | No longer fitted, phased-in modification |
| ** | Phased-in modification |
| E45 | Cruise control system switch |
| J234 | Airbag control unit |
| J248 | Diesel direct injection system control unit |
| T10n | 10-pin connector, black, behind steering column switch trim |
| T17b | 17-pin connector, white, in footwell, front left |
| T17d | 17-pin connector, green, in footwell, front left |
| T17e | 17-pin connector, blue, in footwell, front left |
| A16 | Connection (cruise control system), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| * | Only applies to models with cruise control system |
| F | Brake light switch |
| J248 | Diesel direct injection system control unit |
| N79 | Heater element (crankcase breather) |
| N240 | Unit injector solenoid valve, No. 1 cylinder |
| N241 | Unit injector solenoid valve, No. 2 cylinder |
| N242 | Unit injector solenoid valve, No. 3 cylinder |
| T8b | 8-pin connector, black, at unit injector solenoid valves |
| T17 | 17-pin connector, brown, in footwell, front left |
| T17d | 17-pin connector, green, in footwell, front left |
| T17e | 17-pin connector, blue, in footwell, front left |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| B149 | Positive (+) connection -2- (15a), in interior wiring harness |
| B185 | Connection -2- (54), in interior wiring harness |
| D101 | Connection -1-, in engine compartment wiring harness |
| * | Only applies to models with heater element (crankcase breather) |
| ** | Only applies to models with electric additional heater (PTC 900 W) |
| *** | Phased-in modification |
| **** | Only applies to models with cruise control system |
| F36 | Clutch pedal switch |
| G28 | Engine speed sender |
| G40 | Hall sender |
| J248 | Diesel direct injection system control unit |
| S102 | Engine control unit fuse |
| T17b | 17-pin connector, white, in footwell, front left |
| T17d | 17-pin connector, green, in footwell, front left |
| F25 | Connection -1-, in diesel direct injection system wiring harness |
| F27 | Connection (screening), in diesel direct injection system wiring harness |
| * | No longer fitted, phased-in modification |
| ** | Phased-in modification |
| G70 | Air mass meter |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| J248 | Diesel direct injection system control unit |
| N18 | Exhaust gas recirculation valve |
| N75 | Charge pressure control solenoid valve |
| N211 | Throttle butterfly valve |
| T17d | 17-pin connector, green, in footwell, front left |
| T17h | 17-pin connector, green, connector point, A pillar, right |
| C33 | Connection -5-, in headlight wiring harness |
| * | No longer fitted, phased-in modification |
| ** | Phased-in modification |
| E87 | Air conditioning system/Climatronic operating and display unit |
| E288 | Additional heating button (ECON) |
| J248 | Diesel direct injection system control unit |
| J359 | Low heat output relay |
| J360 | High heat output relay |
| N280 | Air conditioning system compressor regulating valve |
| S126 | Additional heater fuse |
| SB14 | Fuse -14- on fuse box |
| T3c | 3-pin connector, black, behind driver's storage compartment |
| T17 | 17-pin connector, brown, in footwell, front left |
| T17d | 17-pin connector, green, in footwell, front left |
| T17e | 17-pin connector, blue, in footwell, front left |
| Z35 | Additional heating heater element |
| 43 | Earth point, lower part of right A pillar |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| B217 | Connection (additional heater), in interior wiring harness |
| * | Only applies to models with fuel-burning additional heater |
| ** | Only applies to models with electric additional heater (PTC 900 W) |
| *** | Only applies to models without additional heater |
| **** | Only applies to models with air conditioning system |
| J162 | Heater control unit |
| J248 | Diesel direct injection system control unit |
| Q8 | Glow plug with flame monitor |
| SB14 | Fuse -14- on fuse box |
| T2l | 2-pin connector, black, on heater control unit |
| T6h | 6-pin connector, black, on heater control unit |
| T10i | 10-pin connector, black, connector point, A pillar, right |
| T17b | 17-pin connector, white, in footwell, front left |
| T17h | 17-pin connector, green, connector point, A pillar, right |
| V6 | Combustion air blower |
| V54 | Metering pump |
| 43 | Earth point, lower part of right A pillar |
| 176 | Earth connection, in right headlight wiring harness |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| B232 | Connection (additional heater), in interior wiring harness |
| * | Only applies to models with fuel-burning additional heater |
| F1 | Oil pressure switch |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G3 | Coolant temperature gauge |
| G9 | Oil temperature gauge |
| G22 | Speedometer sender (Hall sender, on gearbox) |
| G266 | Oil level/oil temperature sender |
| J285 | Control unit with display in dash panel insert |
| K2 | Alternator warning lamp |
| K132 | Electronic power control fault lamp |
| T17 | 17-pin connector, brown, in footwell, front left |
| T17e | 17-pin connector, blue, in footwell, front left |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 85 | Earth connection -1-, in engine compartment wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| B135 | Connection -1- (15a), in interior wiring harness |
| B177 | Connection (61), in interior wiring harness |
| * | Only applies to models with air conditioner |
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