| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| SA1 | Fuse -1- (30), in the E box |
| T2t | 2-pin connector, in engine compartment, front left (on vehicles with heating) |
| T4n | 4-pin connector, in engine compartment, front left (on vehicles with Climatic / Climatronic) |
| T8a | 8-pin connector, on the onboard power supply control unit (black) |
| 1 | Earth strap, battery body |
| 12 | Earth point, on left in engine compartment (at longitudinal member) |
| 14 | Earth point, on gearbox |
| * | on vehicles with alternator 90A / 110A |
| ** | on vehicles with alternator 140A |
| SC13 | Fuse -13-, in fuse holder |
| SC27 | Fuse -27-, in fuse holder |
| SC29 | Fuse -29-, in fuse holder |
| SC30 | Fuse -30-, in fuse holder |
| SC31 | Fuse -31-, in fuse holder |
| A20 | Positive connection -1- (15a), in dash panel wiring harness |
| B315 | Positive connection -1- (30a), in interior wiring harness |
| ** | only on vehicles with automatic Gearbox |
| J682 | Terminal 50 voltage supply relay, at additional relay holder below dash panel |
| SC1 | Fuse -1-, in fuse holder |
| SC4 | Fuse -4-, in fuse holder |
| T8a | 8-pin connector, on the onboard power supply control unit (black) |
| T11a | 11-pin connector, on the onboard power supply control unit (black) |
| 374 | Earth connection -9-, in interior wiring harness |
| A20 | Positive connection -1- (15a), in dash panel wiring harness |
| B239 | Positive connection -1- (50), in interior wiring harness |
| B279 | Positive connection -3- (15a), in interior wiring harness |
| B280 | Positive connection -4- (15a), in interior wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| J220 | Motronic control unit |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T94a | 94-pin connector, at engine control unit |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 607 | Earth point, on left in plenum chamber |
| 673 | Earth point -3-, on left in engine compartment (at longitudinal member) |
| D180 | Connection -1- (87a), in engine compartment wiring harness |
| ** | only on vehicles with automatic Gearbox |
| G28 | Engine speed sender |
| G40 | Camshaft position sender |
| G83 | Coolant temperature sender at radiator outlet |
| J220 | Motronic control unit |
| J293 | Radiator fan control unit |
| T3l | 3-pin connector, at engine speed sender |
| T3m | 3-pin connector, at camshaft position sender |
| T4p | 4-pin connector, in the holder on the left radiator |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 316 | Earth connection (sender earth) -2- in engine wiring harness |
| D141 | Connection (5V), in engine wiring harness |
| * | only on vehicles with optional equipment, depending upon the type of radiator fan |
| G295 | NOx sender |
| G336 | Intake manifold flap potentiometer |
| J220 | Motronic control unit |
| J583 | NOx sensor control unit |
| T5m | 5-pin connector, at NOx sensor control unit |
| T6t | 6-pin connector, at intake manifold flap motor |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| V157 | Intake manifold flap motor |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D141 | Connection (5V), in engine wiring harness |
| D181 | Connection -2- (87a), in engine compartment wiring harness |
| G42 | Intake air temperature sender |
| G71 | Intake manifold pressure sender |
| G212 | Exhaust gas recirculation potentiometer |
| J220 | Motronic control unit |
| N18 | Exhaust gas recirculation valve |
| T4t | 4-pin connector, at intake air temperature sender and intake manifold pressure |
| T6p | 6-pin connector, at exhaust gas recirculation valve |
| T60a | 60-pin connector, at engine control unit |
| 220 | Earth connection (sender earth), in engine wiring harness |
| D141 | Connection (5V), in engine wiring harness |
| G235 | Exhaust gas temperature sender -1- |
| G247 | Fuel pressure sender |
| G299 | Intake air temperature sender -2- |
| G410 | Fuel pressure sender for low pressure |
| J220 | Motronic control unit |
| T3a | 3-pin connector, at fuel pressure sender for low pressure |
| T3z | 3-pin connector, at fuel pressure sender |
| T60a | 60-pin connector, at engine control unit |
| T94a | 94-pin connector, at engine control unit |
| 220 | Earth connection (sender earth), in engine wiring harness |
| 327 | Earth connection (sender earth), in engine compartment wiring harness |
| D141 | Connection (5V), in engine wiring harness |
| * | only on vehicles with optional equipment, depending upon the type of radiator fan |
| F265 | Map-controlled engine cooling thermostat |
| J220 | Motronic control unit |
| N80 | Activated charcoal filter system solenoid valve |
| N205 | Inlet camshaft timing adjustment valve -1- |
| N276 | Fuel pressure regulating valve |
| N316 | Intake manifold flap valve |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T60a | 60-pin connector, at engine control unit |
| D173 | Connection (87a), in engine wiring harness |
| J220 | Motronic control unit |
| N70 | Ignition coil 1 with output stage |
| N127 | Ignition coil 2 with output stage |
| N291 | Ignition coil 3 with output stage |
| N292 | Ignition coil 4 with output stage |
| P | Spark plug connector |
| Q | Spark plug |
| T4t | 4-pin connector, at ignition coil 1 |
| T4u | 4-pin connector, at ignition coil 2 |
| T4v | 4-pin connector, at ignition coil 3 |
| T4w | 4-pin connector, at ignition coil 4 |
| T60a | 60-pin connector, at engine control unit |
| 15 | Earth point, on cylinder head |
| 281 | Earth connection -1-, in engine wiring harness |
| 306 | Earth connection (ignition coils), in engine harness |
| D35 | Positive connection -1- (15a), in engine wiring harness |
| G294 | Brake servo pressure sensor |
| J162 | Heater control unit |
| J220 | Motronic control unit |
| T4y | 4-pin connector, at brake servo pressure sensor |
| T6s | 6-pin connector, at the brake vacuum pump |
| T94a | 94-pin connector, at engine control unit |
| V192 | Vacuum pump for brakes |
| 327 | Earth connection (sender earth), in engine compartment wiring harness |
| D195 | Connection -1- (5V), in engine compartment wiring harness |
| * | only on vehicles with heating |
| ** | only on vehicles with automatic Gearbox |
| F | Brake light switch |
| F47 | Brake pedal switch |
| G476 | Clutch position sender |
| J220 | Motronic control unit |
| J527 | Steering column electronics control unit |
| T4c | 4-pin connector, at brake pedal switch |
| T5j | 5-pin connector, at clutch position sender |
| T16a | 16-pin connector, on the onboard power supply control unit (black) |
| T20a | 20-pin connector, at steering column electronics control unit |
| T94a | 94-pin connector, at engine control unit |
| 372 | Earth connection -7-, in interior wiring harness |
| 374 | Earth connection -9-, in interior wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| B317 | Positive connection -3- (30a), in interior wiring harness |
| B350 | Positive connection -1- (87a), in interior wiring harness |
| * | not valid for vehicles with automatic gearbox Gearbox |
| G3 | Coolant temperature gauge |
| J220 | Motronic control unit |
| J285 | Control unit in dash panel insert |
| J533 | Data bus diagnostic interface, below dash panel, centre |
| K | Dash panel insert |
| K28 | Coolant temperature and coolant shortage indicator warning lamp |
| T16b | 16-pin connector, for diagnostic connection, below dash panel, left |
| T20c | 20-pin connector, at data bus diagnostic interface |
| T36a | 36-pin connector, at dash panel insert |
| T94a | 94-pin connector, at engine control unit |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| B383 | Connection -1- (CAN H, drive), in interior wiring harness |
| B390 | Connection -1- (CAN L, drive), in interior wiring harness |
| F1 | Oil pressure switch |
| G1 | Fuel gauge |
| G5 | Rev. Counter |
| G21 | Speedometer |
| G169 | Fuel level sender -2- |
| G266 | Oil level/oil temperature sender |
| J285 | Control unit in dash panel insert |
| K | Dash panel insert |
| K3 | Oil pressure warning lamp |
| K38 | Oil level warning lamp |
| K83 | Exhaust emissions warning lamp |
| K105 | Fuel reserve warning lamp |
| K132 | Electronic power control fault lamp |
| T6j | 6-pin connector, on front left in engine compartment (black) |
| T14a | 14-pin connector, on front left in engine compartment (black) |
| T36a | 36-pin connector, at dash panel insert |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 374 | Earth connection -9-, in interior wiring harness |
| * | only on vehicles with extended servicing intervals (ESI) |
| ** | only for vehicles with four-wheel drive |
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