| B | Starter |
| D | Ignition/starter switch |
| J217 | Automatic gearbox control unit |
| J226 | Starter inhibitor and reversing light relay |
| M16 | Reversing light bulb, left |
| M17 | Reversing light bulb, right |
| S7 | Fuse in fuse box/relay plate |
| S11 | Fuse in fuse box/relay plate |
| S13 | Fuse in fuse box/relay plate |
| S15 | Fuse in fuse box/relay plate |
| S231 | Fuse in fuse box |
| T6m | 6-pin connector, brown, engine compartment, in plenum chamber |
| T10b | 10-pin connector, grey, in plenum chamber |
| T10x | 10-pin connector, orange, engine compartment, in plenum chamber |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A23 | Connection (30al), in dash panel wiring harness |
| A87 | Connection (RF (reversing light)), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| B156 | Positive (+) connection (30a), in interior wiring harness |
| B239 | Positive (+) connection -1- (50), in interior wiring harness |
| E87 | Control and display unit for air conditioner/Climatronic |
| F | Brake light switch |
| F125 | Multi-function switch |
| G68 | Vehicle speed sender (inductive sender, 2 connections) |
| G182 | Gearbox input speed sender |
| G195 | Gearbox output speed sender |
| J217 | Automatic gearbox control unit |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| T10b | 10-pin connector, grey, in plenum chamber |
| T10x | 10-pin connector, orange, engine compartment, in plenum chamber |
| T20c | 20-pin connector, in engine compartment, on gearbox |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| B185 | Connection -2- (54), in interior wiring harness |
| D84 | Connection (automatic gearbox), in engine compartment wiring harness |
| * | Only applies to petrol engines (AUM, AUQ) |
| ** | Only applies to diesel engines (ATD, ASZ) |
| *** | Models with air conditioner |
| F189 | Tiptronic switch |
| F270 | Brake pressure switch |
| J217 | Automatic gearbox control unit |
| N110 | Selector lever lock solenoid |
| T10b | 10-pin connector, grey, in plenum chamber |
| T10e | 10-pin connector, black, engine compartment, in plenum chamber |
| 10 | Earth point, in plenum chamber |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 249 | Earth connection -2-, in interior wiring harness |
| B116 | Connection (58d), in interior wiring harness |
| B149 | Positive (+) connection -2- (15a), in interior wiring harness |
| U3 | Connection -1-, in automatic gearbox wiring harness |
| U5 | Connection -2- (15), in automatic gearbox wiring harness |
| U6 | Connection -2-, in automatic gearbox wiring harness |
| * | As of model year 2003 no longer fitted, applies to models with engine codes AUM and AUQ |
| J217 | Automatic gearbox control unit |
| J218 | Combi-processor in dash panel insert |
| J220 | Motronic control unit |
| J248 | Diesel direct injection system control unit |
| T10 | 10-pin connector, white, engine compartment, in plenum chamber |
| T10b | 10-pin connector, grey, in plenum chamber |
| T10g | 10-pin connector, blue, engine compartment, in plenum chamber |
| T16 | 16-pin connector, black, centre console compartment (diagnosis connector) |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| A50 | Positive (+) connection (30as), 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 |
| B116 | Connection (58d), in interior wiring harness |
| B178 | Connection (speed signal), in interior wiring harness |
| * | Only applies to petrol engines (AUM, AUQ) |
| ** | Only applies to diesel engines (ATD, ASZ) |
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