AUDI A3 2003 – Anti-lock brake system (ABS), traction control system (ASR/TCS), electronic differential lock (EDL) and electronic stability program (ESP) for MK60 control unit . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2003 - Voltage supply - brake light switch

A	Battery
B	Starter
D	Ignition/starter switch
F	Brake light switch
J104	ABS with EDL control unit
S9	Fuse in fuse box/relay plate
S13	Fuse in fuse box/relay plate
S15	Fuse in fuse box/relay plate
S162	Fuse -1- (30), in fuse box/battery
S163	Fuse -2- (30), in fuse box/battery
T3e	3-pin connector, black, on main fuse box
2	Earth strap, gearbox - body
12	Earth point, in engine compartment, left
A2	Positive (+) connection (15), in dash panel wiring harness
A36	Connection (75a), in dash panel wiring harness
A50	Positive (+) connection (30as), in dash panel wiring harness
B131	Connection (54), in interior wiring harness
B185	Connection -2- (54), in interior wiring harness
*	Only applies to models with ESP
**	Only applies to models with ASR/TCS

Wiring Diagram AUDI A3 2003 - Speed sensors - lateral acceleration sender - brake pressure sender -1- - yaw rate sender - longitudinal acceleration sender - ABS hydraulic pump

G44	Rear right speed sensor
G45	Front right speed sensor
G46	Rear left speed sensor
G47	Front left speed sensor
G200	Lateral acceleration sender
G201	Brake pressure sender -1-
G202	Yaw rate sender
G251	Longitudinal acceleration sender
J104	ABS with EDL control unit
V64	ABS hydraulic pump
D146	Connection (rear left speed sensor +), in engine compartment wiring harness
D147	Connection (rear left speed sensor -), in engine compartment wiring harness
D148	Connection (rear right speed sensor +), in engine compartment wiring harness
D149	Connection (rear right speed sensor -), in engine compartment wiring harness
J3	Connection -1-, in ABS wiring harness
J5	Connection -2-, in ABS wiring harness
*	Only applies to models with ESP
**	Only applies to models with four-wheel drive, only equipped with ESP and ABS
***	As of November 2001 no longer fitted

Wiring Diagram AUDI A3 2003 - ABS hydraulic unit - switch valves

J104	ABS with EDL control unit
N55	ABS hydraulic unit
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 stabilisation program switch valve -1-
N226	Electronic stabilisation program switch valve -2-
N227	Electronic stabilisation program high pressure valve -1-
N228	Electronic stabilisation program high pressure valve -2-
30	Earth point -1-, next to relay plate
249	Earth connection -2-, in interior wiring harness
277	Earth connection -3-, in interior wiring harness
*	Only applies to models with front-wheel drive and ESP
**	Only applies to models with four-wheel drive and ESP
***	Only applies to models with ABS, ASR/TCS and EDL

Wiring Diagram AUDI A3 2003 - Steering angle sender - ESP sensor unit

G85	Steering angle sender
G200	Lateral acceleration sender
G202	Yaw rate sender
G251	Longitudinal acceleration sender
G419	ESP sensor unit
J...	Engine control units
J104	ABS with EDL control unit
J402	Operating electronics control unit, navigation
T10	10-pin connector, white, engine compartment, -in plenum chamber
T26	26-pin connector, black, on radio
249	Earth connection -2-, in interior wiring harness
A121	Connection (high bus), in dash panel wiring harness
A122	Connection (low bus), in dash panel wiring harness
B139	Connection (PL (parking light, left)), in interior wiring harness
*	Only applies to models with ESP
**	Only applies to models with ESP and ASR/TCS
***	Only applies to models with navigation system
****	From November 2001 onwards
•	CAN bus (data bus)

Wiring Diagram AUDI A3 2003 - Traction control system switch - warning lamps - dash panel insert

E132	Traction control system switch
G34	Brake lining/pad wear sender, front left
J218	Combi-processor in dash panel insert
K32	Brake pad/lining warning lamp
K86	Traction control system warning lamp
T16	16-pin connector, black, centre console compartment (diagnostic connector)
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
277	Earth connection -3-, in interior wiring harness
A76	Connection (diagnosis wire K), in dash panel wiring harness
A132	Connection (TCS/ESP), in dash panel wiring harness
B145	Positive (+) connection (58b), in interior wiring harness
*	Only applies to models with ESP and ASR/TCS
**	Only applies to models with ASR/TCS
•	CAN bus (data bus)