Wiring Diagram VW JETTA 2012 - Battery - Starter - Alternator - Ignition/starter switch
| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| D | Ignition/starter switch |
| J285 | Control unit in dash panel insert |
| T2 | 2-pin connector |
| T4 | 4-pin connector |
| T10b | 10-pin connector |
| T10d | 10-pin connector |
| T32 | 32-pin connector |
| 501 | Threaded connection 2 (30), on relay plate |
| 671 | Earth point 1, on front of left longitudinal member |
| 672 | Earth point 2, on front of left longitudinal member |
| B169 | Positive connection 1 (30), in interior wiring harness |
| B239 | Positive connection 1 (50), in interior wiring harness |
| * | According to equipment |
Wiring Diagram VW JETTA 2012 - Fuse holder A
| J17 | Fuel pump relay |
| SA | Fuse holder A |
| SA1 | Fuse 1 in fuse holder A |
| SA2 | Fuse 2 in fuse holder A |
| SA3 | Fuse 3 in fuse holder A |
| SA4 | Fuse 4 in fuse holder A |
| SC5 | Fuse 5 on fuse holder C |
| SA5 | Fuse 5 in fuse holder A |
| SA6 | Fuse 6 in fuse holder A |
| SC37 | Fuse 37 on fuse holder C |
| SC40 | Fuse 40 on fuse holder C |
| SC51 | Fuse 51 on fuse holder C |
| T10b | 10-pin connector |
| B149 | Positive connection 2 (15a), in interior wiring harness |
| B156 | Positive connection (30a), in interior wiring harness |
| * | According to equipment |
Wiring Diagram VW JETTA 2012 - Lambda probe - Hall sender - Lambda probe after catalytic converter - Main relay - Simos control unit - Activated charcoal filter solenoid valve 1
| G39 | Lambda probe |
| G40 | Hall sender |
| G130 | Lambda probe after catalytic converter |
| J271 | Main relay |
| J361 | Simos control unit |
| N79 | Heater element for crankcase breather |
| N80 | Activated charcoal filter solenoid valve 1 |
| SC41 | Fuse 41 on fuse holder C |
| T10a | 10-pin connector |
| T121 | 121-pin connector |
| 639 | Earth point, left A-pillar |
| 673 | Earth point 3, on front of left longitudinal member |
| B290 | Positive connection 14 (15a) in main wiring harness |
| B611 | Connection 7, in interior wiring harness |
| E30 | Connection (87a), in engine wiring harness |
| * | According to equipment |
Wiring Diagram VW JETTA 2012 - Clutch pedal switch - Coolant temperature display sender - Engine speed sender - Knock sensor 1 - Coolant temperature sender - Simos control unit
| F | Brake light switch |
| F36 | Clutch pedal switch |
| F47 | Brake pedal switch |
| G2 | Coolant temperature display sender |
| G28 | Engine speed sender |
| G61 | Knock sensor 1 |
| G62 | Coolant temperature sender |
| J217 | Automatic gearbox control unit |
| J285 | Control unit in dash panel insert |
| J361 | Simos control unit |
| SC20 | Fuse 20 on fuse holder C |
| SC46 | Fuse 46 on fuse holder C |
| T10a | 10-pin connector |
| T32 | 32-pin connector |
| T68 | 68-pin connector |
| T121 | 121-pin connector |
| 15 | Earth point, on cylinder head |
| A20 | Positive connection (15a), in dash panel wiring harness |
| B432 | Connection (foot operated parking brake), in main wiring harness |
| B615 | Connection for foot-operated parking brake, in interior wiring harness |
| * | From January 2005 |
| *2 | According to equipment |
Wiring Diagram VW JETTA 2012 - Oil level sender - Intake manifold temperature sender - Simos control unit
| G6 | Fuel system pressurisation pump |
| G12 | Oil level sender |
| G71 | Intake manifold pressure sender |
| G72 | Intake manifold temperature sender |
| G79 | Accelerator position sender |
| G185 | Accelerator position sender 2 |
| J285 | Control unit in dash panel insert |
| J361 | Simos control unit |
| T32 | 32-pin connector |
| T121 | 121-pin connector |
| 50 | Earth point, on left in luggage compartment |
| * | According to equipment |
Wiring Diagram VW JETTA 2012 - Simos control unit - Injector - cylinder 1 - Injector - cylinder 2 - Injector - cylinder 3 - Injector - cylinder 4 - Ignition coil 2 - Spark plug connector
| F38 | Ambient temperature switch |
| G65 | High-pressure sender |
| J285 | Control unit in dash panel insert |
| J361 | Simos control unit |
| N30 | Injector, cylinder 1 |
| N31 | Injector, cylinder 2 |
| N32 | Injector, cylinder 3 |
| N33 | Injector, cylinder 4 |
| N122 | Output stage |
| N128 | Ignition coil 2 |
| P | Spark plug connector |
| Q | Spark plugs |
| T10b | 10-pin connector |
| T32 | 32-pin connector |
| T121 | 121-pin connector |
| E48 | Connection (injectors), in injection system wiring harness |
| * | According to equipment |
Wiring Diagram VW JETTA 2012 - Radiator fan thermal switch - Simos control unit
| F18 | Radiator fan thermal switch |
| J234 | Airbag control unit |
| J285 | Control unit in dash panel insert |
| J293 | Radiator fan control unit |
| J361 | Simos control unit |
| T6b | 6-pin connector |
| T10a | 10-pin connector |
| T10w | 10-pin connector |
| T16 | 16-pin connector |
| T32 | 32-pin connector |
| T75 | 75-pin connector |
| T121 | 121-pin connector |
| U31 | Diagnostic connection |
| 607 | Earth point, on left in plenum chamber |
| A76 | Connection (K-diagnosis wire), in dash panel wiring harness |
| B383 | Connection 1 (powertrain CAN bus, high), in main wiring harness |
| B390 | Connection 1 (powertrain CAN bus, low), in main wiring harness |
| B637 | Connection 1 (airbag), in main wiring harness |
| D61 | Connection (air conditioning system), in engine compartment wiring harness |
| * | According to equipment |
| *2 | From December 2004 |
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