Wiring Diagram AUDI A4 2005 - Earth connections
| T4k | 4-pin connector, black, near front bumper |
| 3 | Earth strap, engine - body |
| 12 | Earth point, on left in engine compartment |
| 26 | Earth point, on front apron |
| 50 | Earth point, on left in luggage compartment |
| 78 | Earth point, lower part of right B-pillar |
| 83 | Earth connection 1, in front right wiring harness |
| 86 | Earth connection 1, in rear wiring harness |
| 87 | Earth connection 2, in rear wiring harness |
| 121 | Earth connection 2, in front right wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| 249 | Earth connection 2, in interior wiring harness |
| 345 | Earth connection, in bumper wiring harness |
| * | Cross-section 4.0 possible |
| ** | Cross-section 6.0 possible |
| *** | ⇒ applicable engine Current Flow Diagram |
Wiring Diagram AUDI A4 2005 - Earth connections
| T10c | 10-pin connector, violet, coupling station on left of A-pillar |
| 32 | Earth point, on left behind dash panel insert |
| 33 | Earth point, on right behind dash panel |
| 43 | Earth point, lower part of right A-pillar |
| 44 | Earth point, lower part of left A-pillar |
| 49 | Earth point, near convenience system central control unit |
| 77 | Earth point, lower part of left B-pillar |
| 81 | Earth connection 1, in dash panel wiring harness |
| 135 | Earth connection 2, in dash panel wiring harness |
| 176 | Earth connection, in right headlight wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| 261 | Earth connection, in heated washer jet wiring harness |
| 277 | Earth connection 3, in interior wiring harness |
Wiring Diagram AUDI A4 2005 - Ignition/starter switch - main fuse
| A | Battery |
| B | Starter |
| D | Ignition/starter switch |
| S88 | Strip fuse |
| T17j | 17-pin connector, brown, coupling station on electronics box, plenum chamber |
| 11 | Earth point, in battery box |
| 500 | Screw connection 1 (30), on relay plate |
| 501 | Screw connection 2 (30), on relay plate |
| A2 | Positive connection (15), in dash panel wiring harness |
| A21 | Connection (86s), in dash panel wiring harness |
| A32 | Positive connection (30), in dash panel wiring harness |
| A33 | Connection (75), in dash panel wiring harness |
| * | for models with washer jet heater element only |
| ** | ⇒ applicable engine Current Flow Diagram |
Wiring Diagram AUDI A4 2005 - Steering column electronics control unit - GND
| E45 | Cruise control system switch |
| J527 | Steering column electronics control unit |
| J623 | Engine control unit |
| T16a | 16-pin connector, black, on steering column electronics control unit |
| T17e | 17-pin connector, white, coupling station on electronics box, plenum chamber |
| 135 | Earth connection 2, in dash panel wiring harness |
| A2 | Positive connection (15), in dash panel wiring harness |
| * | ⇒ applicable engine Current Flow Diagram |
Wiring Diagram AUDI A4 2005 - Turn signal switch - intermittent wiper switch - steering angle sender - horn plate - steering column electronics control unit
| E2 | Turn signal switch |
| E22 | Intermittent wiper switch |
| G85 | Steering angle sender |
| H | Horn plate |
| J527 | Steering column electronics control unit |
Wiring Diagram AUDI A4 2005 - Onboard supply control unit - steering column electronics control unit - windscreen wiper motor - washer pump - rear window wiper motor
| J519 | Onboard supply control unit |
| J527 | Steering column electronics control unit |
| T8j | 8-pin connector, black, behind side trim on rear left |
| T10b | 10-pin connector, black, on onboard supply control unit |
| T10c | 10-pin connector, violet, coupling station on left of A-pillar |
| T16a | 16-pin connector, black, on steering column electronics control unit |
| T17 | 17-pin connector, black, coupling station on left of A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V | Windscreen wiper motor |
| V5 | Washer pump |
| V12 | Rear window wiper motor |
| 261 | Earth connection, in heated washer jet wiring harness |
| A146 | Connection (convenience CAN bus, high), in dash panel wiring harness |
| A147 | Connection (convenience CAN bus, low), in dash panel wiring harness |
| * | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
Wiring Diagram AUDI A4 2005 - Light switch - headlight range control regulator
| E1 | Light switch |
| E23 | Front and rear fog light switch |
| E102 | Headlight range control regulator |
| E491 | Deactivation switch for surround lighting |
| J431 | Headlight range control, control unit |
| J519 | Onboard supply control unit |
| S10 | Fuse in relay plate fuse holder |
| T6i | 6-pin connector, brown, behind side trim on rear left |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| 135 | Earth connection 2, in dash panel wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| A19 | Connection (58d), in dash panel wiring harness |
| A114 | Connection (headlight range control), in dash panel wiring harness |
| * | for models with automatic headlight switching / surround lighting only ⇒ applicable Current Flow Diagram |
| ** | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
| *** | for models with headlight range control only |
| **** | for models without headlight range control only ⇒ applicable Current Flow Diagram headlight |
| ***** | for models with automatic headlight range control only ⇒ applicable Current Flow Diagram |
| # | applicable from January 2005 |
Wiring Diagram AUDI A4 2005 - Left headlight - left fog light
| J519 | Onboard supply control unit |
| L22 | Left fog light bulb |
| M1 | Left side light bulb |
| M5 | Front left turn signal bulb |
| M18 | Left side mounted turn signal bulb |
| M29 | Left dipped beam bulb |
| M30 | Left main beam bulb |
| T4k | 4-pin connector, black, near front bumper |
| T17 | 17-pin connector, black, coupling station on left of A-pillar |
| T17a | 17-pin connector, red, coupling station on left of A-pillar |
| T17b | 17-pin connector, green, coupling station on left of A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V48 | Left headlight range control motor |
| 179 | Earth connection, in left headlight wiring harness |
| 345 | Earth connection, in bumper wiring harness |
| A6 | Positive connection (left turn signal), in dash panel wiring harness |
| * | for models without headlight range control only |
| ** | for models with headlights highline, headlights lowline only ⇒ applicable Current Flow Diagram |
| *** | for models with headlight range control only |
Wiring Diagram AUDI A4 2005 - Right headlight - right fog light
| J519 | Onboard supply control unit |
| L23 | Right fog light bulb |
| M3 | Right side light bulb |
| M7 | Front right turn signal bulb |
| M19 | Right side mounted turn signal bulb |
| M31 | Right dipped beam bulb |
| M32 | Right main beam bulb |
| T4k | 4-pin connector, black, near front bumper |
| T17 | 17-pin connector, black, coupling station on left of A-pillar |
| T17c | 17-pin connector, red, coupling station on right of A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V49 | Right headlight range control motor |
| 176 | Earth connection, in right headlight wiring harness |
| 345 | Earth connection, in bumper wiring harness |
| A5 | Positive connection (right turn signal), in dash panel wiring harness |
| * | for models with headlight range control only |
| ** | for models with headlights highline, headlights lowline only ⇒ applicable Current Flow Diagram |
Wiring Diagram AUDI A4 2005 - Reversing lights
| J519 | Onboard supply control unit |
| M2 | Right tail light bulb |
| M4 | Left tail light bulb |
| M6 | Rear left turn signal bulb |
| M8 | Rear right turn signal bulb |
| M9 | Left brake light bulb |
| M10 | Right brake light bulb |
| M16 | Left reversing light bulb |
| M17 | Right reversing light bulb |
| M25 | High level brake light bulb |
| T4l | 4-pin connector, black, in rear lid |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| X | Number plate light |
| 86 | Earth connection 1, in rear wiring harness |
| 87 | Earth connection 2, in rear wiring harness |
| 249 | Earth connection 2, in interior wiring harness |
| A87 | Connection (RL), in dash panel wiring harness |
| B132 | Connection (number plate lights), in interior wiring harness |
| * | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
| ** | applicable from January 2005 |
Wiring Diagram AUDI A4 2005 - Hazard warning lights button - treble tone horn - bass tone horn - rear fog light bulb
| E229 | Hazard warning lights button |
| H2 | Treble tone horn |
| H7 | Bass tone horn |
| J4 | Dual tone horn relay |
| J519 | Onboard supply control unit |
| L46 | Rear left fog light bulb |
| L47 | Rear right fog light bulb |
| T17a | 17-pin connector, red, coupling station on left of A-pillar |
| T17c | 17-pin connector, red, coupling station on right of A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| 81 | Earth connection 1, in dash panel wiring harness |
| 87 | Earth connection 2, in rear wiring harness |
| 135 | Earth connection 2, in dash panel wiring harness |
| 176 | Earth connection, in right headlight wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| * | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
Wiring Diagram AUDI A4 2005 - Brake light switch - X-contact relief relay - headlight washer system pump
| F | Brake light switch |
| J59 | X-contact relief relay |
| J519 | Onboard supply control unit |
| T10b | 10-pin connector, black, on onboard supply control unit |
| T17b | 17-pin connector, green, coupling station on left of A-pillar |
| T23 | 23-pin connector, black, on onboard supply control unit |
| T32b | 32-pin connector, grey, on onboard supply control unit |
| V11 | Headlight washer system pump |
| 81 | Earth connection 1, in dash panel wiring harness |
| 135 | Earth connection 2, in dash panel wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
| A18 | Connection (54), in dash panel wiring harness |
| A34 | Connection (75x), in dash panel wiring harness |
| A57 | Positive connection 3 (30), in dash panel wiring harness |
| * | Protected via fuse S237, for models with headlight washer system only |
Wiring Diagram AUDI A4 2005 - Fuses - radio connector III
| S12 | Fuse in relay plate fuse holder |
| S13 | Fuse in relay plate fuse holder |
| S14 | Fuse in relay plate fuse holder |
| S15 | Fuse in relay plate fuse holder |
| S236 | Fuse in fuse holder |
| S237 | Fuse in fuse holder (headlight washer system) |
| S239 | Fuse in fuse holder |
| S240 | Fuse in fuse holder |
| T8 | 8-connector, black, radio connector III |
| T8j | 8-pin connector, black, behind side trim on rear left |
| 610 | Earth point (audio), under centre console, front |
| A34 | Connection (75x), in dash panel wiring harness |
| A46 | Positive connection (30 - from radio), in dash panel wiring harness |
| A50 | Positive connection (30as), in dash panel wiring harness |
| A57 | Positive connection 3 (30), in dash panel wiring harness |
| A129 | Connection (muting), in dash panel wiring harness |
| A159 | Connection (L), in dash panel wiring harness |
| * | for models with radio chorus, concert or symphony only |
| ** | for models with preparation for radio (trade product) only |
| *** | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
Wiring Diagram AUDI A4 2005 - Fuses - glove compartment light - footwell lights
| E26 | Glove compartment light switch |
| J393 | Convenience system central control unit |
| S2 | Fuse in relay plate fuse holder |
| T12d | 12-pin connector, brown, near glove compartment |
| T12h | 12-pin connector, black, on convenience system central control unit (used to be connector 1) |
| T12i | 12-pin connector, black, on convenience system central control unit (used to be connector 3) |
| T16h | 16-pin connector, black, on convenience system central control unit (used to be connector 2) |
| T16i | 16-pin connector, brown, on convenience system central control unit (used to be connector 5) |
| T17d | 17-pin connector, red, coupling station on electronics box, plenum chamber |
| W6 | Glove compartment light |
| W9 | Left footwell light |
| W10 | Right footwell light |
| 238 | Earth connection 1, in interior wiring harness |
| A29 | Connection (interior light), in dash panel wiring harness |
| A57 | Positive connection 3 (30), in dash panel wiring harness |
| * | for models with key operated switch to deactivate airbag only |
| ** | for models with manual gearbox (not for all engine versions) only |
Wiring Diagram AUDI A4 2005 - Fuses - ashtray illumination - heated rear window - cigarette lighter - 12 V socket
| C18 | Window aerial suppression filter |
| J9 | Heated rear window relay |
| J255 | Climatronic control unit |
| L15 | Ashtray illumination bulb |
| L28 | Cigarette lighter illumination bulb |
| L42 | Socket illumination bulb |
| S1 | Fuse in relay plate fuse holder |
| S226 | Fuse in fuse holder |
| S233 | Fuse in fuse holder |
| S234 | Fuse in fuse holder |
| U1 | Cigarette lighter |
| U5 | 12 V socket |
| Z1 | Heated rear window |
| 81 | Earth connection 1, in dash panel wiring harness |
| 135 | Earth connection 2, in dash panel wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| 653 | Earth point, left D-pillar |
| 654 | Earth point, right D-pillar |
| A57 | Positive connection 3 (30), in dash panel wiring harness |
| B248 | Connection 2 (heated rear window), in interior wiring harness |
| * | For Avant models ⇒ see applicable Current Flow Diagram: Avant models, rear |
| ** | for models without 12 V socket only |
| *** | for models with 12 V socket only |
| **** | for models with 12 V socket only (phased-in modification) |
| ***** | Cross-section 2.5 possible |
| # | fuse was modified from 15 A/ 30 A to 20 A (phased-in modification) |
Wiring Diagram AUDI A4 2005 - Fuses - reversing light switch - electric socket - washer jet heater element
| F4 | Reversing light switch |
| G70 | Air mass meter |
| S3 | Fuse in relay plate fuse holder |
| S5 | Fuse in relay plate fuse holder |
| S231 | Fuse in fuse holder |
| S235 | Fuse in fuse holder |
| T10c | 10-pin connector, violet, coupling station on left of A-pillar |
| T17e | 17-pin connector, white, coupling station on electronics box, plenum chamber |
| U | Electric socket |
| Z20 | Left washer jet heater element |
| Z21 | Right washer jet heater element |
| 249 | Earth connection 2, in interior wiring harness |
| 261 | Earth connection, in heated washer jet wiring harness |
| A52 | Positive connection 2 (30), in dash panel wiring harness |
| A70 | Connection (15a, fuse 231), in dash panel wiring harness |
| A74 | Connection (15a, fuse 5), in dash panel wiring harness |
| D51 | Positive connection 1 (15), in engine compartment wiring harness |
| * | for models with washer jet heater element only |
| ** | for models with 5-speed manual gearbox (not for all engine versions) only |
| *** | for models with 6-speed manual gearbox (not for all engine versions) only |
| **** | Not applicable for all engine versions, ⇒ applicable engine Current Flow Diagram |
| ***** | fuse was modified from 30 A to 20 A (phased-in modification) |
Wiring Diagram AUDI A4 2005 - Fuel gauge sender - ambient temperature switch - coolant temperature display sender - coolant shortage indicator switch
| D2 | Immobilizer reader coil |
| F38 | Ambient temperature switch |
| F66 | Coolant shortage indicator switch |
| F77 | Washer fluid warning contact |
| G | Fuel gauge sender |
| G1 | Fuel gauge |
| G2 | Coolant temperature display sender |
| G3 | Coolant temperature gauge |
| G169 | Fuel gauge sender 2 |
| J285 | Control unit in dash panel insert |
| T10d | 10-pin connector, grey, coupling station on left of A-pillar |
| T14 | 14-pin connector, black, on left in engine compartment |
| T17 | 17-pin connector, black, coupling station on left of A-pillar |
| T17d | 17-pin connector, red, coupling station on electronics box, plenum chamber |
| T17e | 17-pin connector, white, coupling station on electronics box, plenum chamber |
| T32 | 32-pin connector, blue, on dash panel insert |
| 269 | Earth connection (sender earth) 1, in dash panel wiring harness |
| 327 | Earth connection (sender earth), in engine compartment wiring harness |
| * | for models with four-wheel drive only |
| ** | Output for signal earth |
| *** | Not applicable for all engine versions, ⇒ applicable engine Current Flow Diagram |
| **** | For highline equipment only |
Wiring Diagram AUDI A4 2005 - Control unit in dash panel insert - brake fluid level warning contact - oil pressure switch
| C | Alternator |
| F1 | Oil pressure switch |
| F34 | Brake fluid level warning contact |
| G5 | Rev. counter |
| J234 | Airbag control unit |
| J285 | Control unit in dash panel insert |
| J623 | Engine control unit |
| K2 | Alternator warning lamp |
| K75 | Airbag warning lamp |
| T10c | 10-pin connector, violet, coupling station on left of A-pillar |
| T17d | 17-pin connector, red, coupling station on electronics box, plenum chamber |
| T17e | 17-pin connector, white, coupling station on electronics box, plenum chamber |
| T32a | 32-pin connector, green, on dash panel insert |
| 261 | Earth connection, in heated washer jet wiring harness |
| A17 | Connection (61), in dash panel wiring harness |
| A121 | Connection (high bus), in dash panel wiring harness |
| A122 | Connection (low bus), in dash panel wiring harness |
| D66 | Positive connection (61), in engine compartment wiring harness |
| * | ⇒ applicable engine Current Flow Diagram |
Wiring Diagram AUDI A4 2005 - Control unit in dash panel insert - dash panel vent illumination - radio controlled clock
| J285 | Control unit in dash panel insert |
| J489 | Radio controlled clock receiver |
| L50 | Rear centre ashtray illumination bulb |
| L67 | Dash panel left vent illumination bulb |
| L68 | Dash panel central vent illumination bulb |
| L69 | Dash panel right vent illumination bulb |
| L120 | Storage compartment illumination bulb |
| L121 | Cup holder illumination bulb |
| L122 | Coin holder illumination bulb |
| T4m | 4-pin connector, black, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| Y8 | Radio controlled clock |
| 81 | Earth connection 1, in dash panel wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| A175 | Connection (58s), in dash panel wiring harness |
| * | depends on equipment |
| ** | Not for models with front parking aid |
| *** | for models without 12 V socket only |
| **** | for models with 12 V socket only |
Wiring Diagram AUDI A4 2005 - Control unit in dash panel insert - diagnostic connector
| G21 | Speedometer |
| J104 | ABS control unit |
| J285 | Control unit in dash panel insert |
| L157 | Illuminated centre armrest |
| T16 | 16-pin connector, black, diagnostic connector |
| T17b | 17-pin connector, green, coupling station on left of A-pillar |
| T32a | 32-pin connector, green, on dash panel insert |
| 135 | Earth connection 2, in dash panel wiring harness |
| 238 | Earth connection 1, in interior wiring harness |
| A27 | Connection (speed signal), in dash panel wiring harness |
| A76 | Connection (diagnosis wire K), in dash panel wiring harness |
| A175 | Connection (58s), in dash panel wiring harness |
| ** | for models with centre armrest only |
Wiring Diagram AUDI A4 2005 - Control unit in dash panel insert - brake pad wear sender - bonnet contact switch - oil level and oil temperature sender
| F266 | Bonnet contact switch |
| G34 | Front left brake pad wear sender |
| G35 | Front right brake pad wear sender |
| G266 | Oil level and oil temperature sender |
| J285 | Control unit in dash panel insert |
| J393 | Convenience system central control unit |
| T4n | 4-pin connector, black, front left |
| T4o | 4-pin connector, black, front right |
| T10d | 10-pin connector, grey, coupling station on left of A-pillar |
| T14 | 14-pin connector, black, on left in engine compartment |
| T17b | 17-pin connector, green, coupling station on left of A-pillar |
| T17e | 17-pin connector, white, coupling station on electronics box, plenum chamber |
| T20g | 20-pin connector, red, on convenience system central control unit (used to be connector 4) |
| T32 | 32-pin connector, blue, on dash panel insert |
| T32a | 32-pin connector, green, on dash panel insert |
| 12 | Earth point, on left in engine compartment |
| 83 | Earth connection 1, in front right wiring harness |
| 179 | Earth connection, in left headlight wiring harness |
AUDI A4 2005
AUDI A4 2005 Overview of earth points in engine compartment
| 1 - | Earth point, in battery box -11- |
| q | Location ⇒ page → 801/6 |
| 2 - | Earth point, starter battery -624- |
| q | Location → page 801/11 |
| 3 - | Earth point, on left in engine compartment -12- |
| q | not for 2,0 l engine FSI, not for 2,5 l engine TDI, location → page 801/6 |
| q | only for 2.0 l FSI motor, location → page 801/7 |
| q | only for 2,5 l engine TDI, location → page 801/7 |
| 4 - | Earth point, on front apron -26- |
| q | Location → page 801/10 |
| 5 - | Earth point, near coil -19- |
| q | Location → page 801/10 |
| 6 - | Earth point, on engine block -18- |
| q | only for 1.8 l engine, location → page 801/8 |
| q | only for 2.0 l FSI motor, location → page 801/9 |
| q | only for 3.0 l engine, location → page 801/9 |
| Audi A4 | Fitting Locations | No. 801 / 2 |
| Overview of earth points in vehicle interior |
| 1 - | Earth point, lower part of right A-pillar -43- |
| q | Location → page 801/13 |
| 2 - | Earth point, on right behind dash panel -33- |
| q | Location → page 801/12 |
| 3 - | Earth point (audio), under centre console, front -610- |
| q | Location → page 801/15 |
| 4 - | Earth point, lower part of right B-pillar -78- |
| q | Location → page 801/15 |
| 5 - | Earth point, lower part of left B-pillar -77- |
| q | Location → page 801/14 |
| 6 - | Earth point, near convenience system central control unit -49- |
| q | Location → page 801/14 |
| Audi A4 | Fitting Locations | No. 801 / 3 |
| 7 - | Earth point, lower part of left A-pillar -44- |
| q | Location → page 801/13 |
| 8 - | Earth point, on left behind dash panel -32- |
| q | Location → page 801/12 |
| Audi A4 | Fitting Locations | No. 801 / 4 |
Note:
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| 1 - | Earth point, right D-pillar -654- |
| q | Location → page 801/17 |
| 2 - | Earth point in luggage compartment -701- |
| q | Location → page 801/17 |
| 3 - | Earth point, left D-pillar -653- |
| q | Location → page 801/16 |
| 4 - | Earth point, on left in luggage compartment -50- |
| q | Location → page 801/16 |
| Audi A4 | Fitting Locations | No. 801 / 5 |
| Overview of earth points in luggage compartment - Avant models |
| 1 - | Earth point, right D-pillar -654- |
| q | Location → page 801/20 |
| 2 - | Earth point, on right in rear lid -53- |
| q | Location → page 801/19 |
| 3 - | Earth point, left D-pillar -653- |
| q | Location → page 801/20 |
| 4 - | Earth point, on left in rear lid -52- |
| q | Location → page 801/19 |
| 5 - | Earth point, on left in luggage compartment -50- |
| q | Location → page 801/18 |
| Audi A4 | Fitting Locations | No. 801 / 6 |
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