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Audi A3 / S3 (8L; 1997-2003) fuses and relays

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In this article, we consider the first-generation Audi A3 / S3 (8L), produced from 1996 to 2003. Here you will find fuse box diagrams of Audi A3 and S3 1997, 1998, 1999, 2000, 2001, and 2002, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

Fuse Layout Audi A3 / S3 1997-2003

Instrument Panel Fuse Box

Fuse Box Location

The fuses are behind a cover on the driver’s side.

Fuse Box Diagram

Assignment of the fuses in the instrument panel
AmpsFunction/component
120ALeft washer jet heater element
Right washer jet heater element
Driver side heated exterior mirror
Front passenger side heated exterior mirror
210AFront left turn signal bulb
Front right turn signal bulb
Left side mounted turn signal bulb
Right side repeater turn signal bulb
35AIlluminations: Glove compartment light, Operating and display unit for Climatronic air conditioning system
45ANumber plate light
57.5AOperating 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
65ADriver side interior locking switch
Central locking motor with control unit for interior lights switch-off delay and anti-theft alarm system
710ATiptronic switch
Speedometer sender
Oil level and oil temperature sender
Starter inhibitor and reversing light relay
Left reversing light bulb
Right reversing light bulb
85ATelephone and telematics control unit
Mobile telephone operating electronics control unit
Telephone transmitter and receiver unit
95ATraction control system switch
Steering angle sender
ABS control unit
1015AEngine management petrol engine (up to 2001):
Motronic control unit
Motronic current supply relay
Current supply relay for Simos control unit
105AEngine management diesel engine (up to 2001):
Diesel direct injection system control unit
1010AFrom 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
115AOil 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
127.5AUp 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)
1310ALeft brake light bulb
Right brake light bulb
High-level brake light bulb
1410ADoor 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
155AOperating and display unit for Climatronic air conditioning system
Steering angle sender
Automatic gearbox control unit
Control unit in dash panel insert
1610ARadiator fan control unit
177.5ALeft lock cylinder heater element
Right lock cylinder heater element
1810ARight headlight twin filament bulb (main beam)
Main beam warning lamp
1910ALeft headlight twin filament bulb (main beam)
2015AHeadlight 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
2115ARear bulb monitoring device
Left gas discharge light control unit
Left headlight twin filament bulb (dipped beam)
225AControl unit in dash panel insert
Right tail light bulb
Right side light bulb
235AControl unit in dash panel insert
Left side light bulb
Left tail light bulb
2420AAutomatic intermittent wash and wipe relay
2525AOperating and display unit for air conditioning system/Climatronic
Fresh air blower
2625AHeated rear window
2715ARear window wiper and washer relay
Rear window wiper motor
2815A/20AFuel pump relay
2915AEngine management petrol engine:
Motronic control unit
Motronic current supply relay
Simos control unit
Current supply relay for Simos control unit
Output stage
295A/10AEngine management diesel engine:
Diesel direct injection system control unit
3020ASliding sunroof adjustment control unit
3120AAutomatic gearbox control unit
Brake servo control unit
315AFour-wheel drive control unit
3210AEngine management petrol engine:
lnjector, cylinder 1~4
3230AEngine management diesel engine:
Diesel direct injection system control unit
3320AAutomatic intermittent wash and wipe relay
3410AEngine 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
3410AEngine 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
3530ATrailer socket
3615ARear left fog light bulb
Left fog light bulb
Right fog light bulb
3710AUp 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
3720AEngine management petrol engine (from 2001):
Motronic control unit
Motronic current supply relay
Current supply relay for Simos control unit
375AEngine management diesel engine (from 2001):
Diesel direct injection system control unit
3810ADriver 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
3915AHazard 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
4020ATreble tone horn
Bass tone horn
4115ACigarette lighter
4215ANavigation system tuner for TV
Aerial selection control unit
Radio
Amplifier
Amplifier with bass loudspeaker, on left in luggage compartment
Navigation system interface
4310AEngine management petrol engine:
Air mass meter
Active charcoal filter system solenoid valve 1
Lambda probe heater
Lambda probe 1 heater after catalytic converter
4310AEngine management diesel engine:
Clutch pedal switch
Brake pedal switch
Heater element for crankcase heather
Low heat output relay
High heat output relay
4415AHeated cushion for driver seat
Heated backrest for driver seat

Relays

Two relay holders (micro-central electrics and 13-pin relay carrier) are located under the shelf on the driver’s side.

Micro-Central Electrics

Description
ADriver seat adjustment thermal fuse 1
Driver seat adjustment thermal fuse 2
BBrake vacuum pump fuse
CWindow regulator single fuse
1Dual tone horn relay
2X-contact relief relay
31997-2000: Intermittent wash/wipe relay
4Petrol: Fuel pump relay
Diesel: Glow plug relay
51997-2000: Diesel direct injection system relay
2001-2003: Automatic intermittent wash and wipe relay
61997-2000: Fog light relay
2001-2003: Automatic intermittent wash and wipe relay
13-Pin Relay Carrier

Description
11997-2000: Horn
2Rear bulb monitoring device
3Rear bulb monitoring device
41997-2000: Control unit for mirror retraction
2001-2003: Open window regulator relay, front passenger side
51997-2000: Control unit for mirror retraction
2001-2003: Folding exterior mirror control unit
61997-2003: Telephone splitter relay
2001-2003: Folding exterior mirror control unit
72001-2003: Brake light suppression relay
82001-2003: Heated rear window relay
92001-2003: Fuel pump relay (four-wheel drive)
102001-2003: Fuel pump relay (front-wheel drive)
11Starter inhibitor and reversing light relay
121997-2000: Headlight washer system relay
2001-2003: Diesel direct injection system relay
13Radiator fan run-on relay
Coolant pump control unit
14-
15-
16-
17Window regulator thermal fuse (from 2000)
18Multifunction steering wheel fuse (from 2002)

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Engine Compartment Fuse Boxes

Fuse Box №1

The main fuse box is located on the battery.

Description
S131Heater elements
S132Engine management
S133Radiator fan 2
S134Vehicle interior
S138Alternator
S162ABS (pump)
S163ABS (valves)
S164Radiator fan

Fuse Box №2

It is near brake master cylinder (front left, in plenum chamber).

AmpsDescription
1Petrol: Secondary air pump relay
Diesel: High heat output relay
2Petrol: Motronic current supply relay
Current supply relay for Simos control unit
Diesel: Low heat output relay
320ABrake vacuum pump (up to 2003)
420A/40ASpecial vehicle fuse (up to 2002)
5--
6--
7--
8--

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