AUDI A3 2004 — Data bus wires(CAN bus, LIN bus) . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2004 - Drive train CAN bus

E313	Selector lever
J220	Motronic control unit
J248	Diesel direct injection system control unit
J743	Direct shift gearbox mechatronics
T10k	10-pin connector, black, on selector lever
T12	12-pin connector, green, in plenum chamber
T20e	20-pin connector, black (connector A)
T94	94-pin connector, black (connector B)
T121	121-pin connector, black, on engine control unit
B383	Connection -1- (drive train CAN bus, high), in main wiring harness
B390	Connection -1- (drive train CAN bus, low), in main wiring harness
D159	Connection (high bus), in engine compartment wiring harness
D160	Connection (low bus), in engine compartment wiring harness
*	Only applies to models with engine codes AZV, BKC and BKD
**	Only applies to models with engine code BDB
***	Only applies to models with direct shift gearbox (02E)

Wiring Diagram AUDI A3 2004 - Drive train CAN bus

J217	Automatic gearbox control unit
J220	Motronic control unit
J361	Simos control unit
J500	Power steering control unit
T5	5-pin connector, white (connector C)
T6	6-pin connector, black, near longitudinal member, front left
T10n	10-pin connector, black, near longitudinal member, front left
T12	12-pin connector, green, in plenum chamber
T52	52-pin connector, black (connector A)
T94a	94-pin connector, black (connector B)
T121	121-pin connector, black, on engine control unit
B383	Connection -1- (drive train CAN bus, high), in main wiring harness
B390	Connection -1- (drive train CAN bus, low), in main wiring harness
*	Only applies to models with automatic gearbox (09G)
**	Only applies to models with engine code BGU
***	Only applies to models with engine codes AXW, BAG

Wiring Diagram AUDI A3 2004 - Drive train CAN bus

J104	ABS with EDL control unit
J234	Airbag control unit
J431	Headlight range control, control unit
J492	Four-wheel drive control unit
J527	Steering column electronics control unit
J533	Data bus diagnostic interface
T6q	6-pin connector, black, near fuel gauge sender -2-
T20b	20-pin connector, black (connector A)
T20d	20-pin connector, yellow (connector A)
T26a	26-pin connector, black (connector A)
T84	84-pin connector, yellow (connector A)
T84a	84-pin connector, yellow (connector A)
B383	Connection -1- (drive train CAN bus, high), in main wiring harness
B390	Connection -1- (drive train CAN bus, low), in main wiring harness
*	Only applies to models with curtain airbags (blue retainer catch)
**	Only applies to models without curtain airbags (green retainer catch)
***	Only applies to models with anti-lock brake system (ABS) MK60 and direct shift gearbox (02E) or manual gearbox
****	Only applies to models with anti-lock brake system (ABS) MK70
*****	Only applies to models with anti-lock brake system (ABS) MK60 and automatic gearbox (09G)

Wiring Diagram AUDI A3 2004 - Convenience CAN bus

J255	Climatronic control unit
J345	Trailer detector control unit
J446	Parking aid control unit
J527	Steering column electronics control unit
J533	Data bus diagnostic interface
J604	Additional air heater control unit
T4l	4-pin connector, black (connector C)
T10a	10-pin connector, black, behind glove box
T12h	12-pin connector, red (connector A)
T16e	16-pin connector, brown (connector C)
T16f	16-pin connector, brown, on parking aid control unit
T20b	20-pin connector, black (connector A)
B397	Connection -1- (convenience CAN bus, high), in main wiring harness
B406	Connection -1- (convenience CAN bus, low), in main wiring harness

Wiring Diagram AUDI A3 2004 - Convenience CAN bus - LIN bus

G273	Interior monitoring sensor
H12	Alarm horn
J386	Door control unit, driver's side
J387	Door control unit, front passenger's side
J393	Convenience system central control unit
J400	Wiper motor control unit
J519	Onboard power supply control unit
J529	Anti-theft/tilt system control unit
J533	Data bus diagnostic interface
T6g	6-pin connector, black (connector E)
T8h	8-pin connector, black (connector F)
T12e	12-pin connector, black (connector G)
T18	18-pin connector, brown (connector A)
T20	20-pin connector, black, door, A pillar, left
T20a	20-pin connector, black, door, A pillar, right
T20d	20-pin connector, yellow (connector A)
T20f	20-pin connector, black (connector A)
T20g	20-pin connector, black (connector A)
B397	Connection -1- (convenience CAN bus, high), in main wiring harness
B406	Connection -1- (convenience CAN bus, low), in main wiring harness
B528	Connection -1- (LIN bus), in main wiring harness
•	Data bus wire (LIN bus)

Wiring Diagram AUDI A3 2004 - Infotainment CAN bus

J285	Control unit with display in dash panel insert
J401	Navigation system with CD drive control unit
J402	Operating electronics control unit, navigation
J415	Navigation/TV tuner
J533	Data bus diagnostic interface
T16g	16-pin connector, black (connector D)
T20d	20-pin connector, yellow (connector A)
T20h	20-pin connector, black (connector C)
T20k	20-pin connector, black (connector C)
T32	32-pin connector, blue (connector A)
T54a	54-pin connector, black (connector A)
B415	Connection -1- (infotainment CAN bus, high), in main wiring harness
B421	Connection -1- (infotainment CAN bus, low), in main wiring harness
*	Only applies to models with TV tuner
**	Only applies to models with radio navigation system (Japan)
***	Only applies to models with radio navigation system (RNS-E)

Wiring Diagram AUDI A3 2004 - Infotainment CAN bus

J533	Data bus diagnostic interface
R	Radio
R36	Telephone transmitter and receiver unit
R44	Amplifier with bass loudspeaker (luggage compartment, left)
T20d	20-pin connector, yellow (connector A)
T20i	20-pin connector, black (connector A)
T54	54-pin connector, black (connector A)
B415	Connection -1- (infotainment CAN bus, high), in main wiring harness
B421	Connection -1- (infotainment CAN bus, low), in main wiring harness

AUDI A3 2004 Overview of control units

Overview of control units

1 -	Automatic gearbox control unit -J217-

q	for models with automatic gearbox (09G) only

q	Location → chapter

q	Connector assignment → chapter

2 -	Wiper motor control unit -J400-

q	Location → chapter

3 -	Mechatronic unit for dual clutch gearbox -J743-

q	Location for dual clutch gearbox (02E) → chapter

q	Connector assignment for dual clutch gearbox (02E) → chapter

q	Location for dual clutch gearbox (0AM) → chapter

q	Connector assignment for dual clutch gearbox (0AM) → chapter

4 -	Power steering control unit -J500-

q	Location → chapter

q	Connector assignment → chapter

5 -	Left gas discharge light control unit -J343-

q	Location → chapter

5 -	Power output module for left headlight -J667-

q	in headlight

6 -	Garage door operation control unit -J530-

q	Location → chapter

q	Connector assignment → chapter

7 -	Radiator fan control unit -J293-

q	Location → chapter

8 -	Simos control unit -J361-/Motronic control unit -J220-/Diesel direct injection system control unit -J248-/Engine control unit -J623-

q	Location → chapter

q	Connector assignment, 121 pin → chapter

q	Connector assignment, 154 pin → chapter

9 -	Right gas discharge light control unit -J344-

q	Location → chapter

9 -	Power output module for right headlight -J668-

q	in headlight

10 -	Auxiliary heater control unit -J364-

q	under the longitudinal member on front right

q	Connector assignment → chapter

11 -	ABS control unit -J104-

q	Location → chapter

q	Connector assignment, 47 pin → chapter

q	Connector assignment, 26 pin → chapter

Automatic gearbox control unit -J217-

Location: under front left wing, near A pillar

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Connector assignment.

A -	Automatic gearbox control unit -J217-

Pin connector:

B -	52-pin connector -T52-

AUDI A3 2004 Wiper motor control unit J400 Wiper motor control unit -J400-

Location: in plenum chamber atwindscreen wiper motor -V-

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AUDI A3 2004 Mechatronic unit for dual clutch gearbox J743 Mechatronic unit for dual clutch gearbox -J743- Location: on gearbox

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Connector assignment.

A -	Mechatronic unit for dual clutch gearbox -J743-

Pin connector:

B -	20-pin connector -T20e-

AUDI A3 2004 Mechatronic unit for dual clutch gearbox J743 Mechatronic unit for dual clutch gearbox -J743-

Location: on gearbox

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Connector assignment.

-	Mechatronic unit for dual clutch gearbox -J743-

Pin connector:

A -	25-pin connector -T25-

AUDI A3 2004 Power steering control unit J500 Power steering control unit -J500-

Location: on steering box -arrow-

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Connector assignment.

A -	Power steering control unit -J500-

Pin connector:

B -	5-pin connector -T5-

C -	5-pin connector -T5a-

D -	2-pin connector -T2a-

AUDI A3 2004 Left gas discharge light control unit J343 / Right gas discharge light control unit J344 Left gas discharge light control unit -J343-/Right gas discharge light control unit -J344-

Location: on headlight housing

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AUDI A3 2004 Garage door operation control unit J530 Garage door operation control unit -J530- Location: under front bumper-1-

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Connector assignment.

-	Garage door operation control unit -J530-

Pin connector:

A -	4-pin connector -T4ak-

AUDI A3 2004 Radiator fan control unit J293 Radiator fan control unit -J293-

Location: on motor forradiator fan -V7-

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AUDI A3 2004 Simos control unit J361 / Motronic control unit J220 / Diesel direct injection system control unit J248 / Engine control unit J623 Simos control unit -J361-/Motronic control unit -J220-/Diesel direct injection system control unit -J248-/Engine control unit -J623- Location: central in plenum chamber -arrow-

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Connector assignment, 121 pin:

A -	Engine control unit -J623-

Pin connector:

B -	81-pin connector -T81-

C -	40-pin connector -T40-

-T121-made up of items B and C.

Connector assignment, 154 pin:

A -	Engine control unit

Pin connector:

B -	94-pin connector -T94-

C -	60-pin connector -T60-

AUDI A3 2004 ABS control unit J104 ABS control unit -J104-

Location: On bulkhead, in engine compartment, right -arrow-

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Connector assignment:

A -	ABS control unit (MK60) -J104-

Pin connector:

B -	47-pin connector

Connector assignment:

A -	ABS control unit (MK70) -J104-

Pin connector:

B -	26-pin connector

AUDI A3 2004 Auxiliary heater control unit J364

Auxiliary heater control unit -J364-

Connector assignment.

1 -	Auxiliary heater control unit -J364-

Pin connector:

2 -	2-pin connector -T2v-

3 -	2-pin connector -T2x-

5 -	4-pin connector -T4u-

6 -	8-pin connector -T8r-

7 -	3-pin connector -T3j-

8 -	8-pin connector -T8q-

AUDI A3 2004 Overview of control units

Overview of control units

1 -	Headlight range control, control unit -J431-

q	Location → chapter

q	Connector assignment → chapter

2 -	Front passenger seat heating control unit -J727-

q	Location → chapter

q	Connector assignment → chapter

q	not for models with US equipment

2 -	Electronically controlled damping control unit -J250-

q	Location → chapter

q	Connector assignment → chapter

3 -	Sliding sunroof adjustment control unit -J245-

q	Location → chapter

q	Connector assignment → chapter

4 -	NOx sensor control unit -J583-

q	Location → chapter

q	not for models with US equipment

5 -	Rear left door control unit -J388-

q	Location → chapter

q	Connector assignment → chapter

q	for models with 5-door models only

6 -	Control unit in dash panel insert -J285-

q	Location → chapter

q	Connector assignment → chapter

7 -	Fuel pump control unit -J538-

q	Location → chapter

q	Connector assignment → chapter

8 -	Rear right door control unit -J389-

q	Location → chapter

q	Connector assignment → chapter

q	for models with 5-door models only

9 -	Driver seat heating control unit -J726-

q	Location → chapter

q	Connector assignment → chapter

q	not for models with US equipment

9 -	Voltage stabiliser -J532-

q	Location → chapter

q	Connector assignment → chapter

q	not for models with US equipment

10 -	Steering column electronics control unit -J527-

q	Location → chapter

q	Connector assignment → chapter

11 -	Driver door control unit -J386-

q	Location → chapter

q	Connector assignment → chapter

12 -	Onboard supply control unit -J519-

q	Location, from model year 2004 → chapter

q	Location, from model year 2010 → chapter

q	Connector assignment, from model year 2004 → chapter

q	Connector assignment, from model year 2010 → chapter

13 -	Heater control unit -J65-/Heater control unit -J162-

q	Location → chapter

13 -	Climatronic control unit -J255-

q	Location → chapter

q	Connector assignment → chapter

13 -	Air conditioning system control unit -J301-

q	in centre console

q	not for models with US equipment

14 -	Auxiliary air heater control unit -J604-

q	Location → chapter

q	Connector assignment → chapter

q	not for models with US equipment

15 -	Data bus diagnostic interface -J533-

q	Location → chapter

q	Connector assignment → chapter

16 -	CD changer -R41-

q	Location → chapter

16 -	Tyre pressure monitor control unit -J502-

q	Location → chapter

q	Connector assignment → chapter

17 -	Fresh air blower control unit -J126-

q	Location → chapter

18 -	Front passenger door control unit -J387-

q	Location → chapter

q	Connector assignment → chapter

19 -	Airbag control unit -J234-

q	Location → chapter

q	Connector assignment, 75 pin → chapter

q	Connector assignment, 84 pin → chapter

q	Connector assignment, 100 pin → chapter

20 -	Radio -R-/Control unit with display for radio and navigation system -J503-

q	Location → chapter

20 -	Navigation operating electronics control unit -J402-

q	Location → chapter

Headlight range control, control unit -J431-

Location: Below the dash panel on right, on left centre console -arrow-

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Connector assignment.

A -	Headlight range control, control unit -J431-

Pin connector:

B -	26-pin connector -T26a-

AUDI A3 2004 Front passenger seat heating control unit J727 Front passenger seat heating control unit -J727-

Location: Under front passenger seat

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Connector assignment.

-	Front passenger seat heating control unit -J727-

Pin connector:

A -	6-pin connector -T6p-

AUDI A3 2004 Sliding sunroof adjustment control unit J245 Sliding sunroof adjustment control unit -J245-

Location: Under cover for interior light operating unit -arrow-

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Connector assignment.

-	Sliding sunroof adjustment control unit -J245-

Pin connector:

A -	6-pin connector -T6b-

B -	6-pin connector -T6t-

AUDI A3 2004 NOx sensor control unit J583 NOx sensor control unit -J583- Location: on underbody, near NOx catalytic converter

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AUDI A3 2004 Rear left door control unit J388 / Rear right door control unit J389 Rear left door control unit -J388-/Rear right door control unit -J389- Location: in rear door

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Connector assignment.

A -	Rear left door control unit -J388-

Pin connector:

B -	32-pin connector -T32e-

C -	16-pin connector(Vacant)

D -	20-pin connector -T20n-

Connector assignment.

A -	Rear right door control unit -J389-

Pin connector:

B -	32-pin connector -T32f-

C -	16-pin connector(Vacant)

D -	20-pin connector -T20o-

AUDI A3 2004 Control unit in dash panel insert J285 Control unit in dash panel insert -J285-

Location: in dash panel

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Connector assignment.

-	Control unit in dash panel insert -J285-

Pin connector:

A -	32-pin connector -T32-

AUDI A3 2004 Fuel pump control unit J538 Fuel pump control unit -J538-

Location: Under rear seat bench, on fuel pump -arrow-

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Connector assignment.

A -	Fuel pump control unit -J538-

Pin connector:

B -	10-pin connector -T10b-

AUDI A3 2004 Driver seat heating control unit J726 Driver seat heating control unit -J726-

Location: under driver seat

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Connector assignment.

-	Driver seat heating control unit -J726-

Pin connector:

A -	6-pin connector -T6o-

AUDI A3 2004 Steering column electronics control unit J527 Steering column electronics control unit -J527-

Location: On steering column -arrow-

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Connector assignment.

A -	Steering column electronics control unit -J527-

B -	4-pin connector(Airbag mounting)

C -	10-pin connector(Cruise control system and turn signal support)

D -	20-pin connector -T20b-

E -	4-pin connector -T4n-

F -	12-pin connector(Ignition/starter switch and ignition key withdrawal lock support)

G -	8-pin connector(Wiper support, interval potentiometer and multifunction system)

H -	10-pin connector(Steering angle sensor support)

I -	10-pin connector(Coil connector support)

AUDI A3 2004 Driver door control unit J386 Driver door control unit -J386-

Location: In driver door -arrow-

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Connector assignment.

A -	Driver door control unit -J386-

Pin connector:

B -	32-pin connector -T32a-

C -	16-pin connector -T16b-

D -	20-pin connector -T20f-

AUDI A3 2004 Onboard supply control unit J519 Onboard supply control unit -J519-

Location: On left under dash panel, under relay carrier -arrow-

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Connector assignment.

-	Onboard supply control unit -J519-

Pin connector:

A -	11-pin connector -T11b-

B -	12-pin connector -T12c-

C -	12-pin connector -T12d-

D -	11-pin connector -T11c-

E -	16-pin connector -T16a-

F -	8-pin connector -T8h-

G -	12-pin connector -T12e-

H -	12-pin connector

I -	2-pin connector -T2b-

J -	6-pin connector -T6h-

K -	10-pin connector -T10d-

L -	2-pin connector -T2t-

AUDI A3 2004 Onboard supply control unit J519 Onboard supply control unit -J519-

Location: Left under dash panel -arrow-

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Connector assignment.

-	Onboard supply control unit -J519-

Pin connector:

A -	52-pin connector -T52a-

B -	52-pin connector -T52b-

C -	52-pin connector -T52c-

AUDI A3 2004 Heater control unit J65 / Heater control unit J162 Heater control unit -J65-/Heater control unit -J162- Location: in centre console

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AUDI A3 2004 Climatronic control unit J255 Climatronic control unit -J255- Location: in centre console

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Connector assignment.

-	Climatronic control unit -J255-

Pin connector:

A -	12-pin connector -T12f-

B -	20-pin connector -T20j-

C -	16-pin connector -T16e-

D -	16-pin connector -T16d-

AUDI A3 2004 Data bus diagnostic interface J533 Data bus diagnostic interface -J533-

Location: in left footwell -arrow-   Note Location ofData bus diagnostic interface -J533-is the same for right and left-hand drive models.

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Connector assignment.

A -	Data bus diagnostic interface -J533-

Pin connector:

B -	20-pin connector -T20d-

AUDI A3 2004 Fresh air blower control unit J126 Fresh air blower control unit -J126- Location: Under glove compartment, onFresh air blower -V2-

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AUDI A3 2004 Front passenger door control unit J387 Front passenger door control unit -J387- Location: in front passenger door -arrow-

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Connector assignment.

A -	Front passenger door control unit -J387-

Pin connector:

B -	32-pin connector -T32b-

C -	16-pin connector -T16c-

D -	20-pin connector -T20g-

AUDI A3 2004 Airbag control unit J234 Airbag control unit -J234-

Location: Under centre console -arrow-

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Connector assignment.

A -	Airbag control unit -J234-

Pin connector:

B -	75-pin connector -T75-

Connector assignment.

-	Airbag control unit -J234-

Pin connector:

A -	84-pin connector -T84-

A -	84-pin connector -T84a-

Connector assignment.

-	Airbag control unit -J234-

Pin connector:

A -	100-pin connector -T100-

A -	100-pin connector -T100a-

AUDI A3 2004 Auxiliary air heater control unit J604 Auxiliary air heater control unit -J604-

Location: on air conditioning system unit, extreme left, next to heat exchanger

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Connector assignment.

-	Auxiliary air heater control unit -J604-

Pin connector:

A -	4-pin connector -T4l-

AUDI A3 2004 Radio R / Control unit with display for radio and navigation system J503 (RNS-low) Radio -R-/Control unit with display for radio and navigation system -J503- (RNS-low) Location: In centre console -arrow-

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AUDI A3 2004 Navigation operating electronics control unit J402 (RNS-E) Navigation operating electronics control unit -J402- (RNS-E) Location: in centre console

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AUDI A3 2004 CD changer R41 CD changer -R41- Location: In glove box -arrow-

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AUDI A3 2004 Electronically controlled damping control unit J250 Electronically controlled damping control unit -J250- Location: Under front passenger seat -arrow-

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Connector assignment.

-	Electronically controlled damping control unit -J250-

Pin connector:

A -	47-pin connector -T47-

AUDI A3 2004 Tyre pressure monitor control unit J502 Tyre pressure monitor control unit -J502-

Location: Behind the glove compartment -arrow-

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Connector assignment.

-	Tyre pressure monitor control unit -J502-

Pin connector:

A -	20-pin connector -T20q-

AUDI A3 2004 Voltage stabiliser J532 Voltage stabiliser -J532-

Location: Under driver seat -arrow-

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Connector assignment.  -  Voltage stabiliser -J532- Pin connector: A -  12-pin connector -T12x-

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AUDI A3 2004 Overview of control units

Overview of control units    

1 -	Control units on right in luggage compartment

q	Components: -J345-, -J393-, -J446-

q	Location → page 806/2

q	Connector assigment -J345- → page 806/3

q	Connector assigment -J393- → page 806/4

q	Connector assigment -J446- ⇒ page → 806/5

2 -	Control units on left in luggage compartment

q	Components: -J401-, -J415-, -R86-, -R146-

q	Location from -J401- → page 806/6

q	Location from -J415- → page 806/7

q	Location from -R86- → page 806/6

q	Location from -R146- → page 806/7

3 -	All-wheel drive control unit -J492-

q	Location → page 806/8

q	Connector assigment → page 806/9

Audi A3	Fitting Locations	No.  806 / 2

Control units on right in luggage compartment

Location: A -  Parking aid control unit -J446- B -  Trailer detector control unit -J345- C -  Convenience system central control unit -J393-

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Audi A3	Fitting Locations	No.  806 / 3

Connector assignment.

A -	Trailer detector control unit -J345-

Pin connector:

B -	16-pin connector, black -T16h-

C -	12-pin connector, red -T12h-

Audi A3	Fitting Locations	No.  806 / 4

Connector assignment.

A -	Convenience system central control unit -J393-

Pin connector:

B -	18-pin connector, brown -T18-

C -	8-pin connector, black -T8g-

D -	6-pin connector, black -T6g-

Audi A3	Fitting Locations	No.  806 / 5

Connector assignment.

A -	Parking aid control unit -J446-

Pin connector (4 channel parking aid):

B -	16-pin connector, brown -T16f-

C -	Not assigned

D -	12-pin connector, black -T12i-

Pin connector (8 channel parking aid):

B -	16-pin connector, brown -T16f-

C -	12-pin connector, brown -T12t-

D -	12-pin connector, black -T12i-

Audi A3	Fitting Locations	No.  806 / 6

Control units on left in luggage compartment

Location: 3 -  Aerial amplifier for mobile telephone - R86

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Location: 2 -  Navigation system with CD drive control unit (NS-low) -J401-

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Audi A3	Fitting Locations	No.  806 / 7

Location: Satellite radio - R146

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Location: Navigation system tuner for TV -J415-

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Audi A3	Fitting Locations	No.  806 / 8

All-wheel drive control unit -J492-

Location: on rear axle differential, front left

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Audi A3	Fitting Locations	No.  806 / 9

Connector assignment.

-	All-wheel drive control unit -J492-

Pin connector:

A -	2-pin connector -T2ax-

B -	8-pin connector, black -T8y-