AUDI A3 2001 – Anti-locking brake system (ABS) MK20 with electronic differential lock (EDL), traction control system (TCS) and electronic stability program (ESP) . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2001 - Fuse in fuse holder - brake light suppression relay

D	Ignition/starter switch
F	Brake light switch
J104	ABS control unit
J508	Brake light suppression relay
M9	Left brake light bulb
M25	High level brake light bulb
S9	Fuse in relay plate fuse holder
S13	Fuse in relay plate fuse holder
S15	Fuse in relay plate fuse holder
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
*	location, 13-pin relay carrier, under the shelf on the driver's side

Wiring Diagram AUDI A3 2001 - Battery - voltage supply relay main fuse box

A	Battery
B	Starter
J104	ABS control unit
S162	Fuse 1 (30) in fuse holder on battery
S163	Fuse 2 (30) in fuse holder on battery
T3e	3-pin connector, black, on main fuse box
2	Earth strap, gearbox - body
12	Earth point, on left in engine compartment

Wiring Diagram AUDI A3 2001 - Speed sensor

G44	Rear right speed sensor
G45	Front right speed sensor
G46	Rear left speed sensor
G47	Front left speed sensor
J104	ABS control unit
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

Wiring Diagram AUDI A3 2001 - Yaw rate sender - longitudinal acceleration sender - solenoid valve - lateral acceleration sender

G200	Lateral acceleration sender
G202	Yaw rate sender
G251	Longitudinal acceleration sender
J104	ABS control unit
N55	ABS hydraulic unit
N99	Front right ABS inlet valve
N100	Front right ABS outlet valve
N101	Front left ABS inlet valve
N102	Front left ABS outlet valve
N133	Rear right ABS inlet valve
N134	Rear left ABS inlet valve
N135	Rear right ABS outlet valve
N136	Rear left ABS outlet valve
N225	Vehicle stabilization program switch valve 1
N226	Vehicle stabilization program switch valve 2
N227	Vehicle stabilization program high pressure valve 1
N228	Vehicle stabilization program high pressure valve 2
*	for models with four-wheel drive only

Wiring Diagram AUDI A3 2001 - Coding link - ABS hydraulic pump

J104	ABS control unit
J402	Navigation operating electronics control unit
T26	26-pin connector, black, on navigation system control unit
V64	ABS hydraulic pump
30	Earth point 1, next to relay plate
249	Earth connection 2, in interior wiring harness
277	Earth connection 3, in interior wiring harness
B139	Connection (LPL), in interior wiring harness
*	for models with radio or navigation system NS-low only
**	for models with radio navigation system RNS-D only
#	is dropped, from model year 2003

Wiring Diagram AUDI A3 2001 - Brake pressure sender - brake pressure solenoid trip switch

F84	Brake pressure solenoid trip switch
G201	Brake pressure sender 1
G214	Brake pressure sender 2
J104	ABS control unit
N247	Brake pressure solenoid valve
T6r	6-pin connector, black, on brake servo
T14c	14-pin connector, connector prewiring ESP

Wiring Diagram AUDI A3 2001 - Steering angle sender - diagnosis

G85	Steering angle sender
J104	ABS control unit
J218	Combi-processor in dash panel insert
J...	Engine control units
T10	10-pin connector, white, in plenum chamber
T16	16-pin connector, black, shelf centre console (diagnostic connector)
T32a	32-pin connector, green, on dash panel insert
249	Earth connection 2, in interior 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

Wiring Diagram AUDI A3 2001 - Combi-processor in dash panel insert - traction control system warning lamp

E256	TCS and ESP button
G34	Front left brake pad wear sender
J218	Combi-processor in dash panel insert
K32	Brake pad warning lamp
K86	Traction control system warning lamp
T32	32-pin connector, blue, on dash panel insert
249	Earth connection 2, in interior wiring harness
277	Earth connection 3, in interior wiring harness
A132	Connection (TCS/ESP), in dash panel wiring harness
B145	Positive connection (58b), in interior wiring harness