| D | Ignition/starter switch |
| E256 | TCS/ESP button |
| G44 | Rear right speed sensor |
| G45 | Front right speed sensor |
| G46 | Rear left speed sensor |
| G47 | Front left speed sensor |
| J104 | ABS with EDL control unit |
| S7 | Fuse in fuse box |
| T4bc | 4-pin connector, black, for speed sensor, front left |
| T4bd | 4-pin connector, black, for speed sensor, front right |
| T17f | 17-pin connector, black, in 8-point relay carrier, behind driver's storage compartment |
| 100 | Earth connection -1-, in ABS wiring harness |
| 213 | Earth connection -4-, in dash panel wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| J9 | Connection -1- (15a), in ABS wiring harness |
| * | Models with front-wheel drive |
| ** | Models with four-wheel drive |
| *** | Applies to S6 models only |
| F | Brake light switch |
| F9 | Handbrake warning switch |
| F47 | Cruise control system brake pedal switch (diesel direct injection system) |
| J104 | ABS with EDL control unit |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| S13 | Fuse in fuse box |
| S241 | Fuse 41 in fuse box |
| S242 | Fuse 42 in fuse box |
| T17f | 17-pin connector, black, in 8-point relay carrier, behind driver's storage compartment |
| T17i | 17-pin connector, white, connector point, electronics box, plenum chamber |
| 213 | Earth connection -4-, in dash panel wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| A52 | Positive (+) connection 2 (30), in dash panel wiring harness |
| * | Models with petrol engines |
| ** | Models with diesel engines |
| J104 | ABS with EDL control unit |
| G201 | Brake pressure sender -1- |
| N99 | ABS inlet valve, front right |
| N100 | ABS outlet valve, front right |
| N101 | ABS inlet valve, front left |
| N102 | ABS outlet valve, front left |
| N133 | ABS inlet valve, rear right |
| N134 | ABS inlet valve, rear left |
| N135 | ABS outlet valve, rear right |
| N136 | ABS outlet valve, rear left |
| N225 | Electronic stability program switch valve -1- |
| N226 | Electronic stability program switch valve -2- |
| N227 | Electronic stability program high pressure valve -1- |
| N228 | Electronic stability program high pressure valve -2- |
| S123 | ABS control unit fuse 1 |
| V39 | ABS return flow pump |
| 22 | Earth point, on hydraulic unit |
| 100 | Earth connection -1-, in ABS wiring harness |
| G85 | Steering angle sender |
| G200 | Lateral acceleration sender |
| G202 | Yaw rate sender |
| J104 | ABS with EDL control unit |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| S16 | Fuse in fuse box |
| T17f | 17-pin connector, black, in 8-point relay carrier, behind driver's storage compartment |
| 135 | Earth connection -2-, in dash panel wiring harness |
| 199 | Earth connection -3-, in dash panel wiring harness |
| A32 | Positive (+) connection (30), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| • | CAN bus (data wire) |
| * | Both possible |
| F34 | Brake fluid level warning contact |
| J104 | ABS with EDL control unit |
| J285 | Control unit with display in dash panel insert |
| J431 | Headlight range control, control unit |
| K14 | Handbrake warning lamp |
| K47 | ABS warning lamp |
| K118 | Brake system warning lamp |
| K155 | Stability program warning lamp |
| T10e | 10-pin connector, purple, connector point, A pillar, left |
| T16a | 16-pin connector, diagnosis connection |
| T17f | 17-pin connector, black, in 8-point relay carrier, behind driver's storage compartment |
| T26 | 26-pin connector, on operating electronics control unit, navigation |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 261 | Earth connection, in heated washer jet wiring harness |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| * | Models with automatic dynamic headlight range control |
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