| J... | Engine control units |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface, in dash panel insert |
| T10d | 10-pin connector, brown, on control unit protective housing, in engine compartment, left |
| T16 | 16-pin connector, near handbrake lever, self-diagnosis connection |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| 32 | Earth point, behind dash panel, left |
| 81 | Earth connection -1-, in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| * | Only models with tachograph |
| G85 | Steering angle sender |
| J104 | ABS with EDL control unit |
| J220 | Motronic control unit, in control unit protective housing, in engine compartment, left |
| J361 | Simos control unit, in control unit protective housing, on left in engine compartment |
| T10n | 10-pin connector, orange, left connector point A-pillar |
| T15s | 15-pin connector, red, on control unit protective housing, in engine compartment, left |
| T31 | 31-pin connector, on control unit for ABS with EDL |
| T88 | 88-pin connector |
| T121 | 121-pin connector, on control unit |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| J217 | Automatic gearbox control unit |
| J234 | Airbag control unit |
| J248 | Diesel direct injection system control unit, in control unit protective housing |
| T10p | 10-pin connector, yellow, connector point right A pillar |
| T15m | 15-pin connector, brown, connector point, right A pillar |
| T15s | 15-pin connector, red, on control unit protective housing, in engine compartment, left |
| T68a | 68-pin connector |
| T75 | 75-pin connector |
| T88 | 88-pin connector |
| T121 | 121-pin connector, on control unit |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |