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Audi A6 / S6 (C5/4B; 1997-2004) fuses and relays

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In this article, we consider the second-generation Audi A6 / S6 / RS6 (C5/4B), produced from 1997 to 2004. Here you will find fuse box diagrams of Audi A6 1997, 1998, 1999, 2000, 2001, 2002, 2003, and 2004, 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 A6 1997-2004

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
15AHeater element, left washer jet
Heater element, right washer jet
210AHazard warning light switch
35AGlove box light
45ANumber plate light
51997-1999:
Dash panel insert, air conditioner, auxiliary heater, exterior mirrors, heated seats, rear window blind, navigation system, parking aid
52000-2002:
Seat heating, bulb monitoring device, mirror switch, mirror adjustment motors, air conditioner, auxiliary heater, rear roller blind, control unit for: parking aid, navigation system, telephone/telematics, self-levelling suspension, electrical tyre pressure monitoring (alknad models), automatic gearbox (Tiptronic switch)
510A2003-2004:
Oil level/oil temperature sender
Compressor regulating valve, air conditioning system
High pressure sender
Tiptronic switch
Tyre pressure monitor control unit
Bulb monitoring device
Mobile phone operating electronics control unit
Control and display unit for air conditioner/Climatronic
Air quality sensor
Navigation system with CD drive control unit
Self-levelling suspension control unit
Operating unit to control suspension height
Telephone/telematics control unit
Control unit for voice control
Parking aid control unit
Rear roller blind switch
65ACentral locking control unit
710AABS control unit
Steering angle sender
TCS/ESP button
Cruise control system brake pedal switch (diesel direct injection system)
Clutch pedal switch
85ATelephone/telematics control unit
Control unit for voice control
910AHeated exterior mirror, driver's side
Heated exterior mirror, front passenger's side
105AHeadlight range control, control unit
111997-1999: Cruise control system (CCS)
115A2000-2004: Automatic anti-dazzle interior mirror
1210ADiagnosis connection
1310ABrake light switch
Brake light bulbs
141997-2002:
Interior lighting control unit, reading lamps, central locking control unit, vanity mirrors, seat adjustment memory
1410A2003-2004:
Central locking control unit
Memory operating unit, driver's seat
Memory operating unit, front passenger's seat
Luggage compartment release switch
Interior monitor switch
1510AControl unit with display in dash panel insert
Solar cell isolation relay
Navigation system with CD drive control unit
Mirror memory control unit
Auxiliary heating radio controlled receiver
165ASteering angle sender
1710ATyre pressure monitor control unit
Self-levelling suspension control unit
Two-way radio switch
Parking aid control unit
1810AMain beam bulb, right
Main beam warning lamp
1910AMain beam bulb, left
2015ADipped beam bulb, right
Headlight range control motor, right
2115ADipped beam bulb, left
Headlight range control motor, left
225ASide light bulb, right
Tail light bulb, right
235ASide light bulb, left
Tail light bulb, left
2425AAutomatic intermittent wash/wipe relay
Intermittent wiper control
2530 AControl and display unit for air conditioner/Climatronic
Solar cell isolation relay
Fresh air blower
Magnetic coupling relay
Auxiliary heater relay
2630AControl and display unit for air conditioner/Climatronic
Heated rear window switch
2715AHeated steering wheel
Rear window wiper motor
2820AFuel pump (pre-supply pump)
Fuel pump control unit
Fuel pump relay
2920A/30AIgnition coil with output stage (engine code BAS)
Motronic control unit (engine code BAS)
Output stage
Ignition coil with output stage
Motronic control unit
Camshaft timing adjustment valves
3020ASliding sunroof adjustment control unit
311997-1999:
Automatic gearbox, reversing lights, cruise control system, automatic anti-dazzle interior mirror
312000-2002:
Automatic gearbox, reversing lights, diagnostic socket, navigation system, rpm boost, exhaust gas recirculation frequency valve, hazard warning light switch illumination
3115A2003-2004:
Starter inhibitor and reversing light relay
Hazard warning light switch
Reversing light switch
Diagnosis connection
Multi-function switch
Ignition cut-off delay relay
Automatic gearbox control unit
3220 AInjectors
Cruise control system switch
3315ACigarette lighter
Cigarette lighter, rear
3415ASecondary air pump relay
Solenoid valves
Secondary air inlet valve
Turbocharger divert air valve
Air mass meter
Heater for lambda probes
Intake manifold change-over valve
Injectors
Cruise control system
3530ATrailer socket
3615AFront and rear fog light switch
3720ARadio
Amplifier with bass loudspeaker
Aerial selection control unit
Operating electronics control unit, navigation
Navigation/TV tuner
Navigation interface
Chip card reader unit
381997-1999:
Luggage compartment light, central locking system
3820A2000-2004:
Central locking control unit
3915AHazard warning light switch
4025ADual tone horn relay
4125ARelay for ABS solenoid valves (allroad models)
4225AABS control unit
435ARadio
Operating electronics control unit, navigation
4430AAuxiliary heater relay
Solar cells isolation relay 2
Heated driver's seat regulator
Heated front passenger's seat regulator
Heated rear left seat switch with regulator
Heated rear right seat switch with regulator

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Relay Panels

13-point relay carrier

It is behind driver’s storage compartment.

Description
1Dual tone horn relay (telematics - USA)
2Alternator cut-in relay
Alarm system control unit (taxi)
Siren relay (police vehicles)
Alarm system relay, light change-over (special vehicles)
3Solar cell isolation relay
Alarm system control unit (taxi)
Siren relay (police vehicles)
Alarm system relay 2, intermittent main beam (special vehicles)
4Starter inhibitor relay
Starter inhibitor and reversing light relay
5Magnetic coupling relay
Auxiliary heater relay
6Fog light relay
Fuel pump relay (TDI engines)
7Multi-function steering wheel control unit
8Multi-function steering wheel control unit
9Bulb monitoring device
10Bulb monitoring device
11Exterior mirror fold system control unit
12Exterior mirror fold system control unit
13Servotronic control unit
14Taximeter fuse
Fuse E (police vehicles)
Hydraulic pump relay fuse (allroad models)
15-
16Alarm system fuse (taxi)
Fuse B (police vehicles)
17Taximeter and alarm system fuse (taxi)
Fuse C (police vehicles)
Intercom system fuse (special vehicles)
Fog light fuse (daytime driving lights - Canada)

Micro-central electrics

It is behind driver’s storage compartment.

Description
1Dual tone horn relay
2X contact relief relay
3Low range gearing hydraulic pump relay (allroad models)
4Fuel pump relay (petrol engines)
Relay for glow plugs (diesel engines)
5Automatic intermittent wash/wipe relay
6Automatic intermittent wash/wipe relay
A1997-1999: Self-levelling suspension fuse
2000-2004: Steering column adjustment fuse
BRear roller blind fuse
CFor special vehicles

8-point relay carrier

It is behind driver’s storage compartment, behind micro-central electrics

Left-hand drive vehicles

Description
1Relay for solenoid valves - ABS with ESP
2Radiator fan 2nd speed relay
3Radiator fan relay
Continued coolant circulation relay
4Radiator fan run-on relay
5-
6Self-levelling suspension compressor relay (allroad models)
7Return flow pump relay - ABS with ESP
82000-2002: Auxiliary heater control unit (small cooling circuit)
82003-2004: Coolant shut-off valve relay
14Seat adjustment thermo-fuse, driver's side (allroad models)
15Fuse for 12V socket
16Front electric window thermo-fuse
17Rear electric window thermo-fuse
18ABS control unit fuse
19Radiator fan fuse
20Radiator fan control unit fuse
21Seat adjustment thermo-fuse, driver's side
Radiator fan fuse (allroad models)
22Self-levelling suspension fuse
23Self-levelling suspension fuse
24Seat adjustment thermo-fuse, front passenger’s side
Right-hand drive vehicles

 

Description
2Self-levelling suspension compressor relay (allroad models)
3Radiator fan run-on relay
4Relay for solenoid valves - ABS with ESP
5Radiator fan relay
6Return flow pump relay - ABS with ESP
7 Radiator fan 2nd speed relay
8-
9-
10-
11Self-levelling suspension fuse
Seat adjustment thermo-fuse, front passenger's side (RS6 models)
12Seat adjustment thermo-fuse, front passenger's side
Radiator fan fuse (RS6 models)
13Front electric window thermo-fuse
14Rear electric window thermo-fuse
15Seat adjustment thermo-fuse, driver's side
16Radiator fan fuse
17Radiator fan control unit fuse
Fuse for 12V socket (RS6 models)
18ABS control unit fuse
19Fuse for 12V socket

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Relay carrier

It is on the driver’s side, behind dash panel at central carrier.

Description
1Low heat output relay
Brake servo relay
2Auxiliary heater relay
Solar cells isolation relay 2 (LHD)
3High heat output relay
A-
B1997-1999: Fuse for fuel cooling
CAdditional heater fuse 2
Hydraulic pump relay fuse (brake servo)
Fuel pump fuse (RS6 models LHD)
DAdditional heater fuse
Fuel pump fuse (RS6 models RHD)

3-point relay carrier

In the engine compartment (electronics box).

Version 1

Decription
1Additional heater 1 relay (TDI)
2Secondary air pump relay
3Diesel direct injection system relay
5Engine control unit fuse
7Fuse for glow plugs (V6 TDI), secondary air pump fuse
8Additional heater 2 fuse (TDI), fuse stage 2 (V6 TDI)
9Fuse 2 for glow plugs (V6 TDI), fuse for glow plugs (4-cylinder)
Version 2

Description
1Secondary air pump relay (RS6 models)
Auxiliary water pump relay (2000)
1aRadiator fan relay (allroad models)
1bContinued coolant circulation relay (allroad models)
Additional coolant pump relay (2003)
2Secondary air pump relay
3Motronic current supply relay (petrol engines)
Diesel direct injection system relay (diesel engines)
Ignition cut-off delay relay (automatic gearbox 01J)
4Fuel cooling pump relay
Continued coolant circulation relay (RS6 models)
4a-
5Engine control unit fuse
Engine electronics fuse (allroad models)
6Not used (left-hand drive vehicles)
Fuse 2 for glow plugs (V6 TDI, V8 TDI)
Fuse for glow plugs (4-cylinder
Radiator fan fuse (allroad models)
7Fuse for glow plugs (V6 TDI, V8 TDI)
Secondary air pump fuse (petrol engines)
Auxiliary heater fuse (right-hand drive vehicles) up to model year 2000
Not used (right-hand drive vehicles)
8Auxiliary heater fuse (left-hand drive vehicles) up to model year 2000
Not used (left-hand drive vehicles)
9Fuse 2 for glow plugs (V6 TDI, V8 TDI)
Fuse for glow plugs (4-cylinder)
Radiator fan fuse (allroad models)
Coolant pump fuse (RS6 models)
Not used (right-hand drive vehicles)
10Fuse for fuel cooling
Fuse -1- (15) (automatic gearbox 01J)
Radiator fan control unit fuse (allroad models)
Not used (right-hand drive vehicles)
Fuses not in relay carrier
  • Fuse for auxiliary heater
  • Fuse for fuel cooling
  • Fuse -1- (15) (automatic gearbox 01J)
  • Radiator fan control unit fuse (allroad models)
Additional fuses in plenum chamber

RS6:

The fuses are located below coolant expansion tank.

Description
1Fuse -2- (30)
2Fuse -1- (30)
3Auxiliary heater fuse
Battery screw connection (RS6)

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