| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| J367 | Battery monitor control unit |
| SA | Fuse holder A, in E-box in engine compartment |
| SA1 | Fuse 1 in fuse holder A |
| SA4 | Fuse 4 in fuse holder A |
| SA6 | Fuse 6 in fuse holder A |
| SA7 | Fuse 7 in fuse holder A |
| T2du | 2-pin connector, black |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T10g | 10-pin connector, grey, in E-box in engine compartment |
| T10j | 10-pin connector, dark brown, in E-box in engine compartment |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| 14 | Earth point, on gearbox |
| 624 | Earth point, starter battery |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D97 | Connection (50), in engine compartment right wiring harness |
| D210 | Connection (50), in engine compartment wiring harness |
| D218 | Connection 1 (LIN bus) in engine compartment wiring harness |
| * | Only models with manual gearbox |
| *2 | Only models with dual clutch gearbox (DSG) |
| F4 | Reversing light switch |
| J317 | Terminal 30 voltage supply relay, in E-box |
| J329 | Terminal 15 voltage supply relay |
| J623 | Engine control unit, in E-box in engine compartment |
| SB | Fuse holder B, in E-box in engine compartment |
| SB1 | Fuse 1 on fuse holder B |
| SB4 | Fuse 4 on fuse holder B |
| SB9 | Fuse 9 on fuse holder B |
| SB13 | Fuse 13 on fuse holder B |
| SB15 | Fuse 15 on fuse holder B |
| SB20 | Fuse 20 on fuse holder B |
| SB30 | Fuse 30 on fuse holder B |
| SB35 | Fuse 35 on fuse holder B |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| B165 | Positive connection 2 (15), in interior wiring harness |
| D17 | Positive connection 1 (15), in engine harness |
| D50 | Positive connection (30), in engine compartment wiring harness |
| D101 | Connection 1 in engine compartment wiring harness |
| E92 | Positive connection 3 (30), in engine compartment wiring harness |
| * | Only models with manual gearbox |
| G679 | Cylinder 3 combustion chamber pressure sender |
| J179 | Automatic glow period control unit, in E-box in engine compartment |
| J623 | Engine control unit, in E-box in engine compartment |
| Q10 | Glow plug 1 |
| Q11 | Glow plug 2 |
| Q12 | Glow plug 3 |
| Q13 | Glow plug 4 |
| SB | Fuse holder B, in E-box in engine compartment |
| SB33 | Fuse 33 on fuse holder B |
| T4e | 4-pin connector, black |
| T11 | 11-pin connector, black |
| T14f | 14-pin connector, grey |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| 131 | Earth connection 2, in engine compartment wiring harness |
| D101 | Connection 1 in engine compartment wiring harness |
| D144 | Positive connection 5 (30), in engine compartment wiring harness |
| G83 | Radiator outlet coolant temperature sender |
| J623 | Engine control unit, in E-box in engine compartment |
| T2w | 2-pin connector, black |
| T3s | 3-pin connector, black |
| T3u | 3-pin connector, black |
| T10g | 10-pin connector, grey, in E-box in engine compartment |
| T10l | 10-pin connector, light green, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| V188 | Charge air cooling pump |
| V400 | Pump for exhaust gas recirculation cooler |
| 12 | Earth point, on left in engine compartment |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 281 | Earth point 1, engine prewiring harness |
| D181 | Connection 2 (87a) in engine compartment wiring harness |
| G40 | Hall sender |
| G61 | Knock sensor 1 |
| G66 | Knock sensor 2 |
| G684 | Tank sender for reducing agent |
| J623 | Engine control unit, in E-box in engine compartment |
| N79 | Heater element for crankcase breather |
| T2a | 2-pin connector, black |
| T2b | 2-pin connector, black |
| T2g | 2-pin connector, black |
| T3g | 3-pin connector, black |
| T60 | 60-pin connector, black |
| T94 | 94-pin connector, black |
| 283 | Earth point 2, engine prewiring harness |
| 458 | Earth point 3, engine prewiring harness |
| D39 | Connection 1, in engine prewiring harness |
| * | Only models with crankcase breather heater element |
| G31 | Charge pressure sender |
| G62 | Coolant temperature sender |
| G81 | Fuel temperature sender |
| G235 | Exhaust gas temperature sender 1 |
| G247 | Fuel pressure sender |
| J623 | Engine control unit, in E-box in engine compartment |
| T2p | 2-pin connector, black, near exhaust gas recirculation |
| T2q | 2-pin connector, black |
| T2r | 2-pin connector, black |
| T3j | 3-pin connector, black |
| T4j | 4-pin connector, black |
| T60 | 60-pin connector, black |
| 486 | Earth point 4, engine prewiring harness |
| 487 | Earth point 5, engine prewiring harness |
| D39 | Connection 1, in engine prewiring harness |
| * | According to equipment |
| G505 | Pressure differential sender |
| G690 | Temperature sensor 2 for exhaust recirculation |
| G810 | Charge air temperature sender before charge air cooler |
| G811 | Charge air temperature sender after charge air cooler |
| G812 | Coolant temperature sender 3 |
| J623 | Engine control unit, in E-box in engine compartment |
| T2n | 2-pin connector, black |
| T2o | 2-pin connector, black, in middle of engine compartment |
| T2s | 2-pin connector, black |
| T2t | 2-pin connector, black |
| T3e | 3-pin connector, black |
| T60 | 60-pin connector, black |
| 486 | Earth point 4, engine prewiring harness |
| 487 | Earth point 5, engine prewiring harness |
| D39 | Connection 1, in engine prewiring harness |
| * | According to equipment |
| G784 | Particulate sensor |
| J623 | Engine control unit, in E-box in engine compartment |
| J880 | Control unit for reducing agent metering system |
| J881 | Control unit for NOx sender 2 |
| T4b | 4-pin connector, black |
| T4c | 4-pin connector, black |
| T5b | 5-pin connector, black |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T14g | 14-pin connector, black, under driver seat |
| T17g | 17-pin connector, black, in E-box in engine compartment |
| T17p | 17-pin connector, red, under driver seat |
| T94 | 94-pin connector, black |
| H3 | Connection 1 in wiring harness for reducing-agent tank |
| H4 | Connection 2 in wiring harness for reducing-agent tank |
| H5 | Connection 3 in wiring harness for reducing-agent tank |
| H6 | Connection 4 in wiring harness for reducing-agent tank |
| * | Pre-wired component |
| J623 | Engine control unit, in E-box in engine compartment |
| J880 | Control unit for reducing agent metering system |
| J963 | Relay for reducing agent metering system |
| SC43 | Fuse 43 on fuse holder C |
| T2j | 2-pin connector, black |
| T5d | 5-pin connector, colourless |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T14g | 14-pin connector, black, under driver seat |
| T94 | 94-pin connector, black |
| Z104 | Heater for reducing-agent line (heater circuit 2) |
| 336 | Earth connection 1, in floor wiring harness |
| 387 | Earth connection 22, in main wiring harness |
| B350 | Positive connection 1 (87a) in main wiring harness |
| W36 | Positive connection (30a), in floor wiring harness |
| * | Pre-wired component |
| *2 | see applicable current flow diagram for fuse assignment |
| GX19 | Delivery unit for reducing agent metering system |
| G849 | Reducing agent quality sensor |
| J623 | Engine control unit, in E-box in engine compartment |
| T3t | 3-pin connector, black |
| T4d | 4-pin connector, black |
| T5c | 5-pin connector, black |
| T10f | 10-pin connector, green, in E-box in engine compartment |
| T14g | 14-pin connector, black, under driver seat |
| T17g | 17-pin connector, black, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| 336 | Earth connection 1, in floor wiring harness |
| B350 | Positive connection 1 (87a) in main wiring harness |
| W67 | Connection (87), in floor wiring harness |
| * | According to equipment |
| E45 | Cruise control system switch |
| F | Brake light switch, on brake master cylinder |
| G476 | Clutch position sender |
| J104 | ABS control unit |
| J623 | Engine control unit, in E-box in engine compartment |
| J743 | Mechatronic unit for dual clutch gearbox |
| T4f | 4-pin connector, black |
| T4g | 4-pin connector, black |
| T10 | 10-pin connector, black, in E-box in engine compartment |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T10f | 10-pin connector, green, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T16m | 16-pin connector, black |
| T38a | 38-pin connector, black |
| T41 | 41-pin connector, grey |
| T94 | 94-pin connector, black |
| B131 | Connection (54), in interior wiring harness |
| B441 | Connection (CCS), in main wiring harness |
| * | Only models with cruise control system (CCS) |
| *2 | Only models with manual gearbox |
| *3 | Only models with dual clutch gearbox |
| J293 | Radiator fan control unit |
| J623 | Engine control unit, in E-box in engine compartment |
| T4ak | 4-pin connector, black, near radiator fan |
| T4ax | 4-pin connector, black, near radiator fan |
| T94 | 94-pin connector, black |
| V7 | Radiator fan |
| 642 | Earth point for electronically controlled fan |
| * | Only models with medium fan output |
| *2 | Only models with increased fan output |
| *3 | Only models with low fan output |
| D | Ignition/starter switch |
| J623 | Engine control unit, in E-box in engine compartment |
| J906 | Starter relay 1, in E-box in engine compartment |
| J907 | Starter relay 2, in E-box in engine compartment |
| SC | Fuse holder C, in centre of dash panel |
| SC23 | Fuse 23 on fuse holder C |
| SC56 | Fuse 56 on fuse holder C |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| B239 | Positive connection 1 (50), in interior wiring harness |
| B273 | Positive connection (15), in main wiring harness |
| D107 | Connection 5 in engine compartment wiring harness |
| D108 | Connection 6 in engine compartment wiring harness |
| * | Only models with no electric interface |
| GX9 | Intake manifold sender |
| G71 | Intake manifold pressure sender |
| G448 | Exhaust gas temperature sender 2 |
| G495 | Exhaust gas temperature sender 3 |
| G648 | Exhaust gas temperature sender 4 |
| G949 | Temperature sensor 3 for exhaust recirculation |
| J17 | Fuel pump relay, in E-box in engine compartment |
| J623 | Engine control unit, in E-box in engine compartment |
| T2cq | 2-pin connector, light brown, on underbody, near cross panel |
| T2fl | 2-pin connector, light brown, in middle of engine compartment |
| T2fm | 2-pin connector, brown, in middle of engine compartment |
| T2fn | 2-pin connector, black, in middle of engine compartment |
| T4k | 4-pin connector, black |
| T17g | 17-pin connector, black, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| D121 | Connection 19 in engine compartment wiring harness |
| G70 | Air mass meter |
| G701 | Gearbox neutral position sender |
| J623 | Engine control unit, in E-box in engine compartment |
| T3bh | 3-pin connector, black |
| T4bu | 4-pin connector, black |
| T10d | 10-pin connector, blue, in E-box in engine compartment |
| T10g | 10-pin connector, grey, in E-box in engine compartment |
| T94 | 94-pin connector, black |
| D119 | Connection 17 in engine compartment wiring harness |
| D159 | Connection (high bus), in engine compartment wiring harness |
| D160 | Connection (low bus), in engine compartment wiring harness |
| D182 | Connection 3 (87a) in engine compartment wiring harness |
| * | Only models with manual gearbox |
| *2 | Only models with dual clutch gearbox |
| E20 | Switch and instrument illumination regulator |
| E693 | Start/Stop operation button |
| J532 | Voltage stabiliser, in E-box in engine compartment |
| J623 | Engine control unit, in E-box in engine compartment |
| J794 | Control unit 1 for information electronics |
| L76 | Button illumination bulb |
| R | Radio |
| SC | Fuse holder C, in centre of dash panel |
| SC22 | Fuse 22 on fuse holder C |
| SC32 | Fuse 32 on fuse holder C |
| SC58 | Fuse 58 on fuse holder C |
| T6c | 6-pin connector, white |
| T10m | 10-pin connector, light pink, in E-box in engine compartment |
| T12ad | 12-pin connector, black |
| T94 | 94-pin connector, black |
| 382 | Earth connection 17, in main wiring harness |
| B279 | Positive connection 3 (15a) in main wiring harness |
| B340 | Connection 1 (58d), in main wiring harness |
| B341 | Connection 2 (58d), in main wiring harness |
| B342 | Connection 3 (58d), in main wiring harness |
| B465 | Connection 1, in main wiring harness |
| * | see applicable current flow diagram for fuse assignment |
| *2 | Only models with dimmable instrument illumination |
| *3 | see applicable current flow diagram for radio/ radio navigation system |
| *4 | Only models with no dimmable instrument illumination |
| *5 | Only models with preparation for radio |
| J59 | X-contact relief relay |
| J519 | Onboard supply control unit |
| SC | Fuse holder C, in centre of dash panel |
| SC2 | Fuse 2 on fuse holder C |
| SC26 | Fuse 26 on fuse holder C |
| T16 | 16-pin connector, black |
| T73a | 73-pin connector, black |
| T73b | 73-pin connector, white |
| U31 | Diagnostic connection |
| 370 | Earth connection 5, in main wiring harness |
| 371 | Earth connection 6, in main wiring harness |
| 382 | Earth connection 17, in main wiring harness |
| 636 | Earth point, onboard supply control unit |
| B138 | Positive connection (X), in interior wiring harness |
| B173 | Positive connection 2 (X), in interior wiring harness |
| B279 | Positive connection 3 (15a) in main wiring harness |
| * | Only models with no dimmable instrument illumination |
| G1 | Fuel gauge |
| J285 | Control unit in dash panel insert |
| J519 | Onboard supply control unit |
| K | Dash panel insert |
| K2 | Alternator warning lamp |
| K3 | Oil pressure warning lamp |
| T10a | 10-pin connector, brown, in E-box in engine compartment |
| T32 | 32-pin connector, blue |
| T73b | 73-pin connector, white |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| B464 | Connection (speed signal), in main wiring harness |
| B708 | Connection 1 (dash panel insert CAN bus high) in main wiring harness |
| B709 | Connection 1 (dash panel insert CAN bus low) in main wiring harness |
| G | Fuel gauge sender |
| G5 | Rev. counter |
| G6 | Fuel system pressurisation pump |
| G266 | Oil level and oil temperature sender |
| J285 | Control unit in dash panel insert |
| K | Dash panel insert |
| K29 | Glow period warning lamp |
| K38 | Oil level warning lamp |
| SC30 | Fuse 30 on fuse holder C |
| T3bc | 3-pin connector, black, on underbody, near cross panel |
| T6b | 6-pin connector, black, on fuel tank |
| T10c | 10-pin connector, yellow, in E-box in engine compartment |
| T10h | 10-pin connector, orange, in E-box in engine compartment |
| T32 | 32-pin connector, blue |
| Y4 | Trip counter |
| 366 | Earth connection 1, in main wiring harness |
| 367 | Earth connection 2, in main wiring harness |
| 368 | Earth connection 3, in main wiring harness |
| 410 | Earth connection 1 (sender earth) in main wiring harness |
| 636 | Earth point, onboard supply control unit |
| B278 | Positive connection 2 (15a) in main wiring harness |
| * | Only models with extended servicing intervals (ESI) |
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