1997-2003 Audi A3/S3 Fuse Box Diagram

The Audi A3 and S3 are compact cars that were produced from 1996 to 2003. The 8L generation of the A3 and S3 was the first generation of cars, and it was available with a variety of gasoline and diesel engines.

This article provides fuse box diagrams for the 1997-2003 Audi A3 and S3 (8L). Fuses are responsible for protecting the electrical system of your car.

When a fuse blows, it means that there is a short circuit or other problem with the electrical system. If you suspect that a fuse has blown, you can check it using a multimeter or a fuse tester. If the fuse is blown, you will need to replace it with a fuse of the same amperage.

Fuse Box Location

The Audi A3 and S3 have two fuse boxes: one in the passenger compartment and one under the hood. The fuse box diagrams in this article show the location of each fuse and relay in the fuse boxes, as well as the amperage of each fuse.

Instrument Panel

Fuse Number	Fuse Amp. Rating	Function/component
1	20A	Left washer jet heater element Right washer jet heater element Driver side heated exterior mirror Front passenger side heated exterior mirror
2	10A	Front left turn signal bulb Front right turn signal bulb Left side mounted turn signal bulb Right side repeater turn signal bulb
3	5A	Illuminations: Glove compartment light, Operating and display unit for Climatronic air conditioning system
4	5A	Number plate light
5	7.5A	Operating and display unit for Climatronic air conditioning system Cruise control system switch Heated driver seat regulator Heated front passenger seat regulator Fresh air and air recirculation flap switch Operating unit in steering wheel (up to 2002) Temperature flap position switch High pressure sender Radiator fan control unit Navigation system with CD drive control unit Navigation operating electronics control unit Parking aid control unit Multifunction steering wheel control unit Radio Automatic anti-dazzle interior mirror Electric mirror adjustment
6	5A	Driver side interior locking switch Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system
7	10A	Tiptronic switch Speedometer sender Oil level and oil temperature sender Starter inhibitor and reversing light relay Left reversing light bulb Right reversing light bulb
8	5A	Telephone and telematics control unit Mobile telephone operating electronics control unit Telephone transmitter and receiver unit
9	5A	Traction control system switch Steering angle sender ABS control unit
10	15A	Engine management petrol engine (up to 2001): Motronic control unit Motronic current supply relay Current supply relay for Simos control unit
10	5A	Engine management diesel engine (up to 2001): Diesel direct injection system control unit
10	10A	From 2001: Control unit in dash panel insert Navigation operating electronics control unit Radio Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system
11	5A	Oil level and oil temperature sender Fuel pump relay Control unit in dash panel insert Alternator warning lamp Handbrake warning lamp Glow period warning lamp Electronic power control fault lamp Engine electronics warning lamp Selector lever lock solenoid Left headlight range control motor Right headlight range control motor
12	7.5A	Up to 2001: Voltage supply – diagnosis From 2001: Navigation system with CD drive control unit Mobile telephone operating electronics control unit Telephone and telematics control unit Telephone transmitter and receiver unit Aerial amplifier for mobile telephone T16 – 16-pin connector, black, shelf centre console (diagnostic connector)
13	10A	Left brake light bulb Right brake light bulb High-level brake light bulb
14	10A	Door warning lamps control unit Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system Front interior light Front passenger side illuminated vanity mirror Driver side illuminated vanity mirror
15	5A	Operating and display unit for Climatronic air conditioning system Steering angle sender Automatic gearbox control unit Control unit in dash panel insert
16	10A	Radiator fan control unit
17	7.5A	Left lock cylinder heater element Right lock cylinder heater element
18	10A	Right headlight twin filament bulb (main beam) Main beam warning lamp
19	10A	Left headlight twin filament bulb (main beam)
20	15A	Headlight range control regulator Rear bulb monitoring device Right gas discharge light control unit Right headlight twin filament bulb (dipped beam) Left headlight range control motor Right headlight range control motor
21	15A	Rear bulb monitoring device Left gas discharge light control unit Left headlight twin filament bulb (dipped beam)
22	5A	Control unit in dash panel insert Right tail light bulb Right side light bulb
23	5A	Control unit in dash panel insert Left side light bulb Left tail light bulb
24	20A	Automatic intermittent wash and wipe relay
25	25A	Operating and display unit for air conditioning system/Climatronic Fresh air blower
26	25A	Heated rear window
27	15A	Rear window wiper and washer relay Rear window wiper motor
28	15A/20A	Fuel pump relay
29	15A	Engine management petrol engine: Motronic control unit Motronic current supply relay Simos control unit Current supply relay for Simos control unit Output stage
29	5A/10A	Engine management diesel engine: Diesel direct injection system control unit
30	20A	Sliding sunroof adjustment control unit
31	20A	Automatic gearbox control unit Brake servo control unit
31	5A	Four-wheel drive control unit
32	10A	Engine management petrol engine: lnjector, cylinder 1~4
32	30A	Engine management diesel engine: Diesel direct injection system control unit
33	20A	Automatic intermittent wash and wipe relay
34	10A	Engine management petrol engine: Charge pressure control solenoid valve Heater element for crankcase heather Secondary air inlet valve Variable intake manifold change-over valve Turbocharger air recirculation valve Inlet camshaft control valve 1
34	10A	Engine management diesel engine: Air mass meter Needle lift sender Exhaust gas recirculation valve Charge pressure control solenoid valve Variable intake manifold flap change-over valve
35	30A	Trailer socket
36	15A	Rear left fog light bulb Left fog light bulb Right fog light bulb
37	10A	Up to 2001: Control unit in dash panel insert Navigation operating electronics control unit Radio Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system
37	20A	Engine management petrol engine (from 2001): Motronic control unit Motronic current supply relay Current supply relay for Simos control unit
37	5A	Engine management diesel engine (from 2001): Diesel direct injection system control unit
38	10A	Driver side interior locking switch Release button for rear lid lock cylinder Ultrasonic sensor control unit Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system
39	15A	Hazard warning lights system: Front left turn signal bulb Front right turn signal bulb Rear left turn signal bulb Rear right turn signal bulb Left side mounted turn signal bulb Right side mounted turn signal bulb Left turn signal warning lamp Right turn signal warning lamp
40	20A	Treble tone horn Bass tone horn
41	15A	Cigarette lighter
42	15A	Navigation system tuner for TV Aerial selection control unit Radio Amplifier Amplifier with bass loudspeaker, on left in luggage compartment Navigation system interface
43	10A	Engine management petrol engine: Air mass meter Active charcoal filter system solenoid valve 1 Lambda probe heater Lambda probe 1 heater after catalytic converter
43	10A	Engine management diesel engine: Clutch pedal switch Brake pedal switch Heater element for crankcase heather Low heat output relay High heat output relay
44	15A	Heated cushion for driver seat Heated backrest for driver seat

Relays

Micro-Central Electrics

Fuse Number	Description
A	Driver seat adjustment thermal fuse 1 Driver seat adjustment thermal fuse 2
B	Brake vacuum pump fuse
C	Window regulator single fuse
1	Dual tone horn relay
2	X-contact relief relay
3	1997-2000: Intermittent wash/wipe relay
4	Petrol: Fuel pump relay Diesel: Glow plug relay
5	1997-2000: Diesel direct injection system relay 2001-2003: Automatic intermittent wash and wipe relay
6	1997-2000: Fog light relay 2001-2003: Automatic intermittent wash and wipe relay

13-Pin Relay Carrier

Fuse Number	Description
1	1997-2000: Horn
2	Rear bulb monitoring device
3	Rear bulb monitoring device
4	1997-2000: Control unit for mirror retraction 2001-2003: Open window regulator relay, front passenger side
5	1997-2000: Control unit for mirror retraction 2001-2003: Folding exterior mirror control unit
6	1997-2003: Telephone splitter relay 2001-2003: Folding exterior mirror control unit
7	2001-2003: Brake light suppression relay
8	2001-2003: Heated rear window relay
9	2001-2003: Fuel pump relay (four-wheel drive)
10	2001-2003: Fuel pump relay (front-wheel drive)
11	Starter inhibitor and reversing light relay
12	1997-2000: Headlight washer system relay 2001-2003: Diesel direct injection system relay
13	Radiator fan run-on relay Coolant pump control unit
14	–
15	–
16	–
17	Window regulator thermal fuse (from 2000)
18	Multifunction steering wheel fuse (from 2002)

Engine Compartment

Fuse Box 1

Fuse Number	Description
S131	Heater elements
S132	Engine management
S133	Radiator fan 2
S134	Vehicle interior
S138	Alternator
S162	ABS (pump)
S163	ABS (valves)
S164	Radiator fan

Fuse Box 2

Fuse Number	Fuse Amp. Rating	Description
1		Petrol: Secondary air pump relay Diesel: High heat output relay
2		Petrol: Motronic current supply relay Current supply relay for Simos control unit Diesel: Low heat output relay
3	20A	Brake vacuum pump (up to 2003)
4	20A/40A	Special vehicle fuse (up to 2002)
5	–	–
6	–	–
7	–	–
8	–	–

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