| A | Battery |
| B | Starter |
| C | Alternator |
| C1 | Voltage regulator |
| S125 | Glow plug fuse |
| T1ag | Single pin connector, on starter |
| T2bo | 2-pin connector, on alternator |
| T2v | 2-pin connector, near battery |
| T16c | 16-pin connector, yellow, next to relay plate |
| 1 | Earth strap, battery - body |
| 49 | Earth point, near battery |
| D26 | Positive connection (B+), in alternator wiring harness |
| P1 | Positive connection (30), in fuse holder on battery |
| J52 | Glow plug relay |
| J623 | Engine control unit |
| N18 | Exhaust gas recirculation valve |
| Q6 | Engine glow plug |
| T2bh | 2-pin connector, on exhaust gas recirculation valve |
| T9k | 9-pin connector, on glow plug relay |
| T17b | 17-pin connector, in rear engine compartment |
| T18a | 18-pin connector, on diesel direct injection system control unit |
| F31 | Connection 1 (engine glow plugs), in diesel direct injection system wiring harness |
| F33 | Positive connection (30), in diesel direct injection system wiring harness |
| F2 | Driver door contact switch |
| J362 | Immobilizer control unit |
| J623 | Engine control unit |
| N22 | Temperature sensor 2 series resistor |
| N78 | Altitude correction solenoid valve |
| T1w | Single connector, on driver door contact switch |
| T8g | 8-pin connector, on immobilizer control unit |
| T16a | 16-pin connector, behind driver storage compartment |
| T16g | 16-pin connector, red, behind the glove compartment |
| T17b | 17-pin connector, in rear engine compartment |
| T18a | 18-pin connector, on diesel direct injection system control unit |
| 131 | Earth connection 2, in engine compartment wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| F22 | Oil pressure switch |
| G2 | Coolant temperature sender |
| G22 | Speedometer sender |
| G62 | Coolant temperature sender |
| N211 | Throttle butterfly valve |
| T1v | Single pin connector, on oil pressure switch |
| T2bi | 2-pin connector, on throttle butterfly valve |
| T3o | 3-pin connector, on speedometer sender |
| T4aa | 4-pin connector, on coolant temperature sender |
| T16f | 16-pin connector, black, behind the glove compartment |
| T16g | 16-pin connector, red, behind the glove compartment |
| T17b | 17-pin connector, in rear engine compartment |
| 18 | Earth point on engine block |
| 43 | Earth point, lower part of right A-pillar |
| 85 | Earth connection 1, in engine compartment wiring harness |
| 220 | Earth connection (sender earth), in engine wiring harness |
| G | Fuel gauge sender |
| J82 | Ignition cut-off relay |
| J362 | Immobilizer control unit |
| N109 | Fuel shut-off valve |
| R | Radio |
| SA10 | Fuse 10 on fuse holder A |
| SA20 | Fuse 20 on fuse holder A |
| T2bk | 2-pin connector, on fuel shut-off valve |
| T4z | 4-pin connector, on fuel pump |
| T8g | 8-pin connector, on immobilizer control unit |
| T8h | 8-connector, on radio |
| T9l | 9-pin connector, on electric drive main relay |
| T16b | 16-pin connector, red, next to relay plate |
| T16f | 16-pin connector, black, behind the glove compartment |
| T16g | 16-pin connector, red, behind the glove compartment |
| T17b | 17-pin connector, in rear engine compartment |
| 213 | Earth connection, in dash panel wiring harness |
| 335 | Earth connection 5, in dash panel wiring harness |
| A20 | Positive connection (15a), in dash panel wiring harness |
| D | Ignition/starter switch |
| J59 | X-contact relief relay |
| R | Radio |
| SA24 | Fuse 24 on fuse holder A |
| SA32 | Fuse 32 on fuse holder A |
| T6a | 6-pin connector, on X-contact relief relay |
| T7c | 7-pin connector, on ignition/starter switch |
| T8h | 8-connector, on radio |
| T16f | 16-pin connector, black, behind the glove compartment |
| TV2 | Terminal 30 wiring junction |
| A2 | Positive connection (15), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A49 | Connection 1, in dash panel wiring harness |
| F25 | Connection 1, in diesel direct injection system wiring harness |
| Designation of connector: | | A - | ABS control unit -J104- | | B - | 31-pin connector, on ABS control unit -T31a- |
| Airbag control unit -J234- | | | | | Designation of connector: | | A - | Airbag control unit -J234- | | B - | 75-pin connector, on ABS control unit -T75a- |
| Control unit with display in dash panel insert -J285- | | | | | Designation of connector: | | A - | Control unit with display in dash panel insert -J285- | | B - | 32-pin connector, on control unit with display in dash panel insert -T32a- | | 8 - | Coolant temperature sender | | 20 - | Immobilizer control unit | | 29 - | Brake system monitoring | | B - | 32-pin connector, on control unit with display in dash panel insert -T32a- | Note | for models with 1.0 l Flex engine, 1.0 l and 1.4 l petrol engines only, from March 2008 | | 4 - | Terminal CAN-Bus high | | 14 - | Brake system monitoring | | 15 - | Immobilizer control unit | | 16 - | Immobilizer control unit |
| Control unit with display in dash panel insert -J285- | Note | for models Generation IV with dash panel Generation III only | | | | | Designation of connector: | | A - | Control unit with display in dash panel insert -J285- | | B - | 32-pin connector, on control unit in dash panel insert -T32a- | | 8 - | Coolant temperature sender | | 16 - | Immobilizer control unit | | 22 - | Coolant shortage indicator sender | | 29 - | Brake system monitoring |
| Convenience system central control unit -J393- | | | | | Designation of connector: | | A - | Convenience system central control unit -J393- | | B - | 12-pin connector, on convenience system central control unit -T12c- | | C - | 23-pin connector, on convenience system central control unit -T23a- | | D - | 12-pin connector, on convenience system central control unit -T12b- |
| Engine control unit -J623- | | | | | Designation of connector: | | A - | Engine control unit -J623- | | B/C - | 80-pin connector, on engine control unit -T80a- |
| Air conditioning system control unit -J301- | | | | | Designation of connector: | | A - | Air conditioning system control unit -J301- | | B - | 5-pin connector, on air conditioning system control unit -T5d- | | C - | 7-pin connector, on heater control unit -T7d- |
| Immobilizer control unit -J362- | | | | | Designation of connector: | | A - | Immobilizer control unit -J362- | | B - | 8-pin connector, on immobilizer control unit -T8g- | | C - | 2-pin connector, on immobilizer control unit -T2bp- |
| Alarm system control unit -J85- | | | | | Designation of connector: | | A - | Alarm system control unit -J85- | | B - | 22-pin connector, on alarm system control unit -T22a- |
| | | | | | | | |
