| J104 | ABS and EDL control unit |
| J217 | Automatic gearbox control unit |
| J234 | Airbag control unit |
| T10n | 10-pin connector, orange, coupling station left A-pillar |
| T10p | 10-pin connector, yellow, coupling station right A-pillar |
| T15m | 15-pin connector, brown, coupling station right A-pillar |
| T31 | 31-pin connector, on control unit for ABS and EDL |
| T68a | 68-pin connector, on automatic gearbox control unit |
| T75 | 75-pin connector, on airbag control unit |
| T88 | 88-pin connector, on automatic gearbox control unit |
| 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 |
| * | Applies only to models with a 5-speed automatic gearbox |
| ** | Applies only to models with a 4-speed automatic gearbox |
| *** | Applies only to models with traction control system (TCS) |
| G85 | Steering angle sender |
| J104 | ABS and EDL control unit |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| T5g | 5-pin connector, black |
| T10d | 10-pin connector, brown, on protective housing for control units, on left in engine compartment |
| T10n | 10-pin connector, orange, coupling station left A-pillar |
| T15s | 15-pin connector, red, on protective housing for control units, on left in engine compartment |
| T88 | 88-pin connector, on automatic gearbox control unit |
| T94 | 94-pin connector |
| T121 | 121-pin connector |
| 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 |
| D159 | Connection (high-bus), in engine compartment wiring harness |
| D160 | Connection (low-bus), in engine compartment wiring harness |
| * | Applies only to models with ESP |
| ** | Applies only to models with a petrol engine |
| *** | Applies only to models with a diesel engine |
| + | Only engine code BGW |
| --- | Applies only to models with engine code BDN |
| J285 | Control unit with display in dash panel insert |
| J533 | Data bus diagnostic interface |
| S5 | Fuse in fuse box/relay plate |
| S12 | Fuse in fuse box/relay plate |
| T16 | 16-pin connector, self-diagnosis connection |
| T32a | 32-pin connector, blue, on dash panel insert |
| T32b | 32-pin connector, green, on dash panel insert |
| 32 | Earth point, on left behind dash panel |
| 81 | Earth connection -1-, in dash panel wiring harness |
| A74 | Connection (15a, fuse 5), 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 |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| * | Only models with tachograph |
| J255 | Climatronic control unit |
| J393 | Convenience system central control unit |
| J453 | Multi-function steering wheel control unit |
| J538 | Fuel pump control unit |
| T6v | 6-pin connector, lilac |
| T6w | 6-pin connector |
| T10a | 10-pin connector, brown, coupling station left A-pillar |
| T10f | 10-pin connector, blue, coupling station left A-pillar |
| T12 | 12-pin connector, black, on Climatronic control unit |
| T12t | 12-pin connector, on fuel pump control unit |
| T18m | 18-pin connector, black, on multi-function steering wheel control unit |
| T20 | 20-pin connector, red, on Climatronic control unit |
| T23 | 23-pin connector, black, on convenience system central control unit |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| W64 | Connection (convenience CAN bus, high), in floor wiring harness |
| W65 | Connection (convenience CAN bus, low), in floor wiring harness |
| * | Only vehicles with radio and navigation system (RNS) and radio 'delta' |
| ** | Applies only to models with engine code BDN |
| J412 | Mobile telephone operating electronics control unit |
| J431 | Headlight range control, control unit |
| J446 | Parking aid control unit |
| J503 | Control unit with display for radio and navigation |
| R | Radio |
| T8 | 8-pin connector, black *** |
| T10h | 10-pin connector, red, coupling station right A-pillar |
| T10m | 10-pin connector, red * |
| T15c | 15-pin connector, red, coupling station right A-pillar+ |
| T15y | 15-pin connector, black, coupling station right-A pillar |
| T16d | 16-pin connector, black, on radio** |
| T16h | 16-pin connector, on parking aid control unit |
| T18 | 18-pin connector, on mobile telephone operating electronics control unit |
| T20 | 20-pin connector, red, on control unit for headlight range control |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| * | Applies only to models with navigation (monochrome display) |
| ** | Applies only to models with radio'delta' |
| *** | Applies only to models without radio'delta' |
| + | Discontinued as of May 2003 |
| J415 | Navigation/TV tuner |
| J503 | Control unit with display for radio and navigation |
| J506 | Control unit with display for TV, radio and navigation |
| J559 | Traffic information control unit |
| R12 | Amplifier |
| T8 | 8-pin connector, black |
| T12u | 12-pin connector, black |
| T15d | 15-pin connector, white, coupling station left A-pillar for estate, coupling station right A-pillar for saloon |
| T24 | 24-pin connector, on amplifier |
| T26 | 24-pin connector, black |
| T54t | 54-pin connector, black, on navigation/TV tuner |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| A148 | Connection (navigation CAN bus, high), in dash panel wiring harness |
| A149 | Connection (navigation CAN bus, low), in dash panel wiring harness |
| * | Applies only to models with navigation (colour display) |
| ** | Only with TV |
| *** | Applies only to models with digital sound package (DSP) |
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