| T14i | 14-pin connector, in engine compartment, left |
| 12 | Earth point, in engine compartment, left |
| 50 | Earth point, luggage compartment, left |
| 96 | Earth connection -1-, in seat heating wiring harness |
| 98 | Earth connection, in rear lid wiring harness |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 188 | Earth connection -3-, in air conditioner wiring harness |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| 279 | Earth connection -5-, in interior wiring harness |
| 283 | Earth connection -2-, in engine wiring harness |
| 285 | Earth connection -7-, in interior wiring harness |
| 640 | Earth point -2-, in engine compartment, left |
| B | Starter |
| D | Ignition/starter switch |
| F125 | Multi-function switch |
| J17 | Fuel pump relay |
| J59 | X contact relief relay |
| J207 | Starter inhibitor relay |
| S11 | Fuse in fuse box |
| T6m | 6-pin connector, brown, in plenum chamber |
| T10b | 10-pin connector, grey, in plenum chamber |
| 50 | Earth point, luggage compartment, left |
| 238 | Earth connection -1-, in interior wiring harness, near luggage compartment light |
| A2 | Positive (+) connection (15), in dash panel wiring harness |
| A98 | Positive (+) connection -4- (30), in dash panel wiring harness |
| B138 | Positive (+) connection (X), in interior wiring harness, near micro-central electrics |
| B156 | Positive (+) connection -4- (30), in interior wiring harness |
| B157 | Positive (+) connection -3- (15a), in interior wiring harness |
| * | Models with manual gearbox |
| ** | Models with automatic gearbox 09G |
| *** | Roadster |
| A | Battery |
| C | Alternator |
| H | Horn plate |
| H2 | High tone horn |
| H7 | Low tone horn |
| J4 | Dual tone horn relay |
| J104 | ABS with EDL control unit |
| J299 | Secondary air pump relay |
| S131 | Fuse 1 |
| S132 | Fuse 2 |
| S133 | Fuse 3 |
| S134 | Fuse 4 |
| S138 | Fuse 5 |
| S162 | Fuse -1- (30), in fuse box/battery |
| S163 | Fuse -2- (30), in fuse box/battery |
| S164 | Fuse -3- (30), in fuse box/battery |
| T2ap | 2-pin connector, in engine compartment, left, for high tone horn |
| T2aq | 2-pin connector, in engine compartment, left, for low tone horn |
| T3e | 3-pin connector, black, on main fuse box/battery |
| T5a | 5-pin connector, yellow, behind steering column switch trim |
| 42 | Earth point, steering column |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A72 | Connection (71), in dash panel wiring harness |
| * | Models with secondary air pump |
| ** | Applies to 132 kW engine only |
| *** | Applies to 165 kW engine only |
| # | Applies to 184 kW engine only |
| ## | Up to model year 2003 |
| ### | From model year 2004 onwards |
| C | Alternator |
| D2 | Immobilizer reading coil |
| J285 | Control unit with display in dash panel insert |
| J429 | Central locking control unit |
| K2 | Alternator warning lamp |
| K32 | Brake pad/lining warning lamp |
| K117 | Immobilizer warning lamp |
| K132 | Electronic power control fault lamp |
| N13 | Brake pad/lining wear indicator, left (shear element) |
| T2f | 2-pin connector, wiring duct, in engine compartment, left |
| T2ae | 2-pin connector, on bulkhead, left |
| T4b | 4-pin connector, in engine compartment, left |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 249 | Earth connection -2-, in interior wiring harness |
| A21 | Connection (86s), in dash panel wiring harness |
| A50 | Positive (+) connection (30a), in dash panel wiring harness |
| * | Models with manual heater controls |
| ** | Models with air conditioner |
| C10 | Suppression filter |
| F1 | Oil pressure switch |
| F140 | Switch: Front left belt |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G5 | Rev. counter |
| G6 | Fuel pump (pre-supply pump) |
| G169 | Fuel gauge sender -2- |
| J220 | Motronic control unit |
| J285 | Control unit with display in dash panel insert |
| K3 | Oil pressure warning lamp |
| K16 | Reserve fuel warning lamp |
| K19 | Seat belt warning system warning lamp |
| T6i | 6-pin connector, under driver's seat |
| T10x | 10-pin connector, orange, in plenum chamber |
| T14i | 14-pin connector, in engine compartment, left |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 249 | Earth connection -2-, in interior wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A27 | Connection (speed signal), in dash panel wiring harness, near micro-central electrics |
| * | Models with front-wheel drive |
| ** | Models with four-wheel drive |
| *** | Wiring in fuel tank |
| F2 | Door contact switch, driver's side |
| F66 | Coolant shortage indicator switch |
| G21 | Speedometer |
| G22 | Speedometer sender (Hall sender, on gearbox) |
| H3 | Buzzer/gong |
| J285 | Control unit with display in dash panel insert |
| K1 | Main beam warning lamp |
| K28 | Coolant temperature/coolant shortage warning lamp |
| T10d | 10-pin connector, brown, connector carrier, A pillar, left |
| T14i | 14-pin connector, in engine compartment, left |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| Y | Analogue clock |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 283 | Earth connection -2-, in engine wiring harness |
| A108 | Connection (speed signal), in dash panel wiring harness |
| B154 | Connection -1- (TK (door contact)), in interior wiring harness |
| R2 | Connection (door contact switch, left), in electric window/central locking and door contact switch wiring harness |
| * | Sender earth output |
| ** | Only models with manual gearbox |
| F9 | Handbrake warning switch |
| F34 | Brake fluid level warning contact |
| G17 | Ambient temperature sensor |
| G106 | Ambient temperature indicator |
| J285 | Control unit with display in dash panel insert |
| J492 | Four-wheel drive control unit |
| K4 | Side light warning lamp |
| K14 | Handbrake warning lamp |
| K33 | Brake fluid level warning lamp |
| T8d | 8-pin connector, on four-wheel drive control unit |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 42 | Earth point, steering column |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| 279 | Earth connection -5-, in interior wiring harness, behind dash panel |
| A115 | Connection (handbrake warning), in dash panel wiring harness |
| * | Models with quattro four-wheel drive |
| E87 | Air conditioning system operating and display unit |
| G209 | Anti-theft alarm ultra-sonic sensor |
| G303 | Interior monitor sender/receiver module 1 |
| J220 | Motronic control unit |
| J234 | Airbag control unit |
| J285 | Control unit with display in dash panel insert |
| J429 | Central locking control unit |
| J431 | Headlight range control, control unit |
| J492 | Four-wheel drive control unit |
| R | Radio |
| T8 | 8-pin connector, black, radio connector III |
| T8d | 8-pin connector, on four-wheel drive control unit |
| T10x | 10-pin connector, orange, in plenum chamber |
| T12a | 12-pin connector, behind dash panel, right |
| T32a | 32-pin connector, green, on dash panel insert |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| * | Models with air conditioning system |
| ** | Coupé models |
| *** | Roadster |
| # | Models with automatic headlight range control |
| ## | Models with quattro four-wheel drive |
| ### | Models with interior monitoring |
| E256 | TCS/ESP button |
| G2 | Coolant temperature sender |
| G3 | Coolant temperature gauge |
| J104 | ABS with EDL control unit |
| J217 | Automatic gearbox control unit |
| J234 | Airbag control unit |
| J285 | Control unit with display in dash panel insert |
| J412 | Operating electronics control unit, mobile phone |
| J429 | Central locking control unit |
| J743 | Direct shift gearbox mechatronics |
| K47 | ABS warning lamp |
| K75 | Airbag warning lamp |
| K127 | Rear lid open warning lamp |
| K155 | Stabilising program warning lamp |
| T10b | 10-pin connector, grey, in plenum chamber |
| T14i | 14-pin connector, in engine compartment, left |
| T20a | 20-pin connector, on direct shift gearbox mechatronics |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| T54 | 54-pin connector, on operating electronics control unit, mobile phone |
| 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 |
| J5 | Connection -2-, in ABS wiring harness |
| • | CAN bus (data wire) |
| * | Models with automatic gearbox 09G |
| ** | Models with direct shift gearbox 02E |
| E87 | Control and display unit for air conditioner |
| J285 | Control unit with display in dash panel insert |
| J293 | Radiator fan control unit, in engine compartment, front left |
| K65 | Left turn signal warning lamp |
| K94 | Right turn signal warning lamp |
| T8 | 8-pin connector, black, radio connector III |
| T12a | 12-pin connector, behind dash panel, right |
| T14b | 14-pin connector, connector A on J293 |
| T17 | 17-pin connector, behind dash panel, right, to air conditioner wiring harness |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 45 | Earth point, behind dash panel - centre |
| A19 | Connection (58s), in dash panel wiring harness (switch illumination) |
| A116 | Connection -2- (58d), in dash panel wiring harness |
| B145 | Positive (+) connection (58s), in interior wiring harness |
| L40 | Connection (air conditioner pressure switch) -2-, in Climatronic wiring harness |
| * | Models with air conditioner |
| E2 | Turn signal switch |
| E4 | Headlight dipper/flasher switch |
| E19 | Parking light switch |
| M5 | Turn signal bulb, front left |
| M7 | Turn signal bulb, front right |
| M18 | Side turn signal bulb, left |
| M19 | Side turn signal bulb, right |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| A5 | Positive (+) connection (right turn signal), in dash panel wiring harness |
| A6 | Positive (+) connection (left turn signal), in dash panel wiring harness |
| B141 | Positive (+) connection -1- (56a), in interior wiring harness |
| E1 | Lighting switch |
| E23 | Front and rear fog light switch |
| K13 | Rear fog light warning lamp |
| K17 | Fog light warning lamp |
| L9 | Lighting switch light bulb |
| L40 | Front and rear fog light switch illumination bulb |
| S236 | Fuse 36 in fuse box |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A51 | Connection (56), in dash panel wiring harness |
| B139 | Connection (PL (parking light, left)), in interior wiring harness |
| B140 | Connection (PR (parking light, right)), in interior wiring harness |
| * | Does not apply to models for Japan |
| ** | Only models for Japan |
| C22 | Interference suppression choke for airbag |
| E3 | Hazard warning light switch |
| J220 | Motronic control unit |
| J234 | Airbag control unit |
| J429 | Central locking control unit |
| T10a | 10-pin connector, white, in plenum chamber |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A49 | Connection -1-, in dash panel wiring harness |
| A125 | Connection (crash signal), in dash panel wiring harness |
| E20 | Switches and instruments light regulator |
| E102 | Headlight range control adjuster |
| L54 | Headlight range control adjuster light bulb |
| S20 | Fuse in fuse box |
| T10ac | 10-pin connector, on headlight, left |
| T10ad | 10-pin connector, on headlight, right |
| V48 | Headlight range control motor, left |
| V49 | Headlight range control motor, right |
| 42 | Earth point, steering column |
| 199 | Earth connection -3-, in dash panel wiring harness, near lighting switch |
| 249 | Earth connection -2-, in interior wiring harness |
| 269 | Earth connection (sender earth) -1-, in dash panel wiring harness |
| A103 | Connection -2- (56), in dash panel wiring harness |
| A114 | Connection (headlight range control), in dash panel wiring harness, near lighting switch |
| E22 | Intermittent wiper switch |
| E38 | Intermittent wiper control |
| J31 | Automatic intermittent wash/wipe relay |
| V5 | Windscreen washer pump |
| 249 | Earth connection -2-, in interior wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A96 | Connection (53c), in dash panel wiring harness |
| A97 | Connection (53), in dash panel wiring harness |
| J31 | Automatic intermittent wash/wipe relay |
| S3 | Fuse in fuse box |
| S4 | Fuse in fuse box |
| S233 | Fuse 33 in fuse box |
| V | Windscreen wiper motor |
| W6 | Glove box light |
| X4 | Number plate light, left |
| X5 | Number plate light, right |
| 52 | Earth point in rear lid, left |
| 98 | Earth connection in rear lid wiring harness |
| 131 | Earth connection 2, in engine compartment wiring harness |
| 277 | Earth connection 3, in interior wiring harness, behind dash panel |
| A37 | Connection (58a), in dash panel wiring harness |
| * | Models with headlight washer system |
| ** | Coupé models |
| *** | Roadster |
| # | From model year 2005 onwards |
| C10 | Suppression filter |
| F | Brake light switch |
| F4 | Reversing light switch |
| F47 | Cruise control system brake pedal switch |
| J104 | ABS with EDL control unit |
| J219 | Reversing light relay |
| J220 | Motronic control unit |
| L46 | Rear fog light bulb, left |
| L47 | Rear fog light bulb, right |
| M2 | Tail light bulb, right |
| M4 | Tail light bulb, left |
| M6 | Turn signal bulb, rear left |
| M8 | Turn signal bulb, rear right |
| M9 | Brake light bulb, left |
| M10 | Brake light bulb, right |
| M16 | Reversing light bulb, left |
| M17 | Reversing light bulb, right |
| M25 | High level brake light bulb |
| T10e | 10-pin connector, black, in plenum chamber |
| T10x | 10-pin connector, orange, in plenum chamber |
| 238 | Earth connection -1-, in interior wiring harness, near luggage compartment light |
| A87 | Connection (RF (reversing light)), in dash panel wiring harness |
| B131 | Connection (54), in interior wiring harness |
| B185 | Connection -2- (54), in interior wiring harness |
| * | Does not apply to models for Japan |
| ** | Only models for Japan |
| *** | Models with direct shift gearbox 02E |
| E87 | Control and display unit for air conditioner |
| S1 | Fuse in fuse box |
| S2 | Fuse in fuse box |
| S224 | Fuse in fuse box |
| S225 | Fuse in fuse box |
| S226 | Fuse in fuse box |
| T2k | 2-pin connector, black, on bonnet |
| T2l | 2-pin connector, black, on bonnet |
| T10w | 10-pin connector, blue, connector carrier, A pillar, left |
| T10z | 10-pin connector, blue, connector carrier, A pillar, right |
| T17 | 17-pin connector, behind dash panel, right, to air conditioner wiring harness |
| Z4 | Heated exterior mirror, driver's side |
| Z5 | Heated exterior mirror, front passenger's side |
| Z20 | Heater element, left washer jet |
| Z21 | Heater element, right washer jet |
| 131 | Earth connection -2-, in engine compartment wiring harness |
| A81 | Connection -2- (X), in dash panel wiring harness |
| L59 | Positive (+) connection (30), in heater unit wiring harness |
| * | Models with manual heater controls |
| ** | Models with air conditioner |
| E15 | Heated rear window switch |
| J9 | Heated rear window relay |
| J429 | Central locking control unit |
| J492 | Four-wheel drive control unit |
| S5 | Fuse in fuse box |
| S6 | Fuse in fuse box |
| S7 | Fuse in fuse box |
| S231 | Fuse in fuse box |
| T6n | 6-pin connector, connection for convertible top/hardtop, left |
| T6o | 6-pin connector, connection for convertible top/hardtop, right |
| T8d | 8-pin connector, for four-wheel drive control unit |
| Z1 | Heated rear window |
| Z24 | Heated rear window with window aerial |
| 98 | Earth connection, in rear lid wiring harness |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| 284 | Earth connection -6-, in interior wiring harness |
| A38 | Positive (+) connection -2- (15a), in dash panel wiring harness |
| B149 | Positive (+) connection -2- (15a), in interior wiring harness, near starter inhibitor and reversing light relay |
| Q49 | Connection (closed), in interior wiring harness |
| * | Coupé models |
| ** | Roadster |
| *** | Models with quattro four-wheel drive |
| # | Convertible top |
| ## | Hardtop |
| ### | Models with direct shift gearbox 02E |
| J104 | ABS with EDL control unit |
| J220 | Motronic control unit |
| J429 | Central locking control unit |
| L15 | Ashtray light bulb |
| L28 | Cigarette lighter light bulb |
| S9 | Fuse in fuse box |
| S10 | Fuse in fuse box |
| S237 | Fuse 37 in fuse box |
| S238 | Fuse 38 in fuse box |
| S239 | Fuse 39 in fuse box |
| S240 | Fuse 40 in fuse box |
| S241 | Fuse 41 in fuse box |
| S242 | Fuse 42 in fuse box |
| T2p | 2-pin connector, behind console |
| T6m | 6-pin connector, brown, in plenum chamber |
| U1 | Cigarette lighter |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A36 | Connection (75a), in dash panel wiring harness |
| A46 | Positive (+) connection (30 - from radio), in dash panel wiring harness |
| D78 | Positive (+) connection -1- (30a), in engine compartment wiring harness |
| E94 | Heated driver's seat regulator |
| E95 | Heated front passenger's seat regulator |
| J220 | Motronic control unit |
| J429 | Central locking control unit |
| S12 | Fuse in fuse box |
| S13 | Fuse in fuse box |
| S14 | Fuse in fuse box |
| S15 | Fuse in fuse box |
| S229 | Fuse 29 in fuse box |
| S243 | Fuse 43 in fuse box |
| S244 | Fuse 44 in fuse box |
| T6m | 6-pin connector, brown, in plenum chamber |
| T16 | 16-pin connector, black, shelf on driver's side (diagnosis connection) |
| 277 | Earth connection -3-, in interior wiring harness, behind dash panel |
| A1 | Positive (+) connection (30a), in dash panel wiring harness |
| A139 | Connection -3- (15), in dash panel wiring harness |
| B111 | Positive (+) connection -1- (30a), in interior wiring harness, near lighting switch |
| D80 | Positive (+) connection (87a - for activated charcoal filter system solenoid valve), in engine compartment wiring harness |
| D102 | Connection -2-, in engine compartment wiring harness |
| * | Only applies to 1.8 litre engine (AUM, AUQ, ARY, BAM) |
| ** | Only applies to 3.2 litre engine (BHE) |
| F18 | Radiator fan thermo-switch |
| F54 | Radiator fan thermo-switch |
| J17 | Fuel pump relay |
| J151 | Continued coolant circulation relay |
| J293 | Radiator fan control unit, in engine compartment, front left |
| S228 | Fuse 28 in fuse box |
| S232 | Fuse 32 in fuse box |
| S234 | Fuse 34 in fuse box |
| T14b | 14-pin connector, connector A on J293 |
| T14i | 14-pin connector, in engine compartment, left |
| V7 | Radiator fan |
| V51 | Continued coolant circulation pump |
| 188 | Earth connection -3-, in air conditioner wiring harness |
| 640 | Earth point -2-, in engine compartment, left |
| A68 | Connection (30, air conditioner), in dash panel wiring harness |
| A99 | Connection -1- (87), in dash panel wiring harness |
| A100 | Connection -2- (87), in dash panel wiring harness |
| D140 | Connection (injectors), in engine wiring harness |
| * | Applies to 132 kW engine only |
| ** | Applies to 165 kW engine only |
| *** | Applies to 184 kW engine only |
| # | Models without air conditioner |
| ## | Models with air conditioner, see Current Flow Diagram: Air conditioner |
| E9 | Fresh air blower switch |
| E159 | Fresh air/air recirculating flap switch |
| N24 | Fresh air blower with overheating fuse series resistor |
| T4c | 4-pin connector, behind console |
| V2 | Fresh air blower |
| V154 | Fresh air/air recirculating flap control motor |
| 44 | Earth point, lower part of left A pillar |
| 162 | Earth connection, in blower motor wiring harness |
| B135 | Connection (15a), in interior wiring harness |
| L66 | Connection, in heater blower wiring harness |
| * | Applies to 165 kW engine only |
| F147 | Vanity mirror contact switch, driver's side |
| F148 | Vanity mirror contact switch, front passenger's side |
| J429 | Central locking control unit |
| W | Interior light, front |
| W13 | Reading light, front passenger's side |
| W14 | Illuminated vanity mirror, front passenger's side |
| W19 | Reading light, driver's side |
| W20 | Illuminated vanity mirror, driver's side |
| 128 | Earth connection 1, in interior light wiring harness, near interior light |
| B116 | Connection (58s), in interior wiring harness |
| B151 | Positive (+) connection 3 (30a), in interior wiring harness, near interior light |
| * | As of model year 2005 no longer fitted (Roadster) |
| ** | From model year 2005 onwards (Roadster only) |
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