AUDI A3 2005 — Trailer towing attachment . Wiring diagrams, Pin Connector, Location

Wiring Diagram AUDI A3 2005 - Earth points and earth connections

11	Earth point, in battery box
30	Earth point 1, next to relay plate
50	Earth point, on left in luggage compartment
98	Earth connection, in rear lid wiring harness
238	Earth connection 1, in interior wiring harness
277	Earth connection 3, in interior wiring harness
280	Earth connection, in communications wiring harness
285	Earth connection 7, in interior wiring harness

Wiring Diagram AUDI A3 2005 - Fuses

D	Ignition/starter switch
E1	Light switch
S5	Fuse in relay plate fuse holder
S20	Fuse in relay plate fuse holder
S21	Fuse in relay plate fuse holder
S22	Fuse in relay plate fuse holder
S223	Fuse in fuse holder
S235	Fuse in fuse holder
U10	Trailer socket
238	Earth connection 1, in interior wiring harness
A2	Positive connection (15), in dash panel wiring harness
A51	Connection (56), in dash panel wiring harness
A98	Positive connection 4 (30), in dash panel wiring harness
A103	Connection 2 (56), in dash panel wiring harness
B135	Connection 1 (15a), in interior wiring harness
B143	Positive connection (58R), in interior wiring harness
B144	Positive connection (58L), in interior wiring harness
B156	Positive connection (30a), in interior wiring harness

Wiring Diagram AUDI A3 2005 - Rear left bulbs

E18	Rear fog light switch
F216	Rear fog light cut-out contact switch
J446	Parking aid control unit
L46	Rear left fog light bulb
M4	Left tail light bulb
M5	Front left turn signal bulb
M6	Rear left turn signal bulb
M7	Front right turn signal bulb
M9	Left brake light bulb
M16	Left reversing light bulb
U10	Trailer socket
238	Earth connection 1, in interior wiring harness
280	Earth connection, in communications wiring harness
A87	Connection (RL), in dash panel wiring harness
A88	Connection (RFL), in dash panel wiring harness
B114	Connection (inhibitor switch), in interior wiring harness
B152	Connection (BL), in interior wiring harness
B153	Connection (RTS), in interior wiring harness

Wiring Diagram AUDI A3 2005 - Rear right bulbs and bulb check warning unit

F	Brake light switch
J124	Rear bulb monitoring device
J508	Brake light suppression relay
M2	Right tail light bulb
M8	Rear right turn signal bulb
M10	Right brake light bulb
M17	Right reversing light bulb
T5h	5-pin connector, brown, A-pillar left, near relay plate
W35	Right luggage compartment light
238	Earth connection 1, in interior wiring harness
285	Earth connection 7, in interior wiring harness
B131	Connection (54), in interior wiring harness
B185	Connection 2 (54), in interior wiring harness
*	for models with bulb check warning unit only
**	for models without bulb check warning unit only
***	for models with anti-lock brake system (ABS) MK20
****	for models with anti-lock brake system (ABS) MK60 only

Wiring Diagram AUDI A3 2005 - Auto-check system - bulb check warning unit - left and right twin filament bulb

E3	Hazard warning light switch
J2	Hazard warning light relay
J124	Rear bulb monitoring device
J189	Auto-check system
K18	Trailer operation warning lamp
L1	Left headlight twin filament bulb
L2	Right headlight twin filament bulb
M25	High level brake light bulb
T4j	4-pin connector, left headlight
T4l	4-pin connector, right headlight
T5h	5-pin connector, brown, A-pillar left, near relay plate
T8g	8-pin connector, brown, on left in luggage compartment
T32	32-pin connector, blue, on dash panel insert
T32b	32-pin connector, grey, on dash panel insert
98	Earth connection, in rear lid wiring harness
277	Earth connection 3, in interior wiring harness
280	Earth connection, in communications wiring harness
*	for models without bulb check warning unit only