Audi A6 C5 (Avant) 1997 – 2004 fuse and relay

Our article provides information on relay boxes and fuses of the Audi A6 C5 with their diagrams, designation of elements and locations of boxes. The second generation Audi A6 was produced in sedan and station wagon bodies (Avant) in 1997, 1998, 1999, 2000, 2001, 2002, 2003 and 2004 and the series was designated as C5.

Audi-A6 C5 photo


general arrangement of fuse boxes

  1. 3-slot mounting box
  2. 8-slot mounting box
  3. Central switchgear with relay box
  4. Main fuse box
  5. 13-slot mounting block
  6. Mounting block in plenum box

Before replacing a fuse, you must disconnect the corresponding load and turn off the ignition.

3-slot mounting box


3 fuse box


1Low heat output
relay – J359 Brake servo relay – J569
2Auxiliary heater relay – J8 Solar isolation relay – J354
3High power relay -J360
ANot used
BNot used
CAuxiliary heater
fuse 2 – S143 Hydraulic pump fuse (brake booster) – S279
Fuel pump fuse – S81 (RS6 LHD)
DAuxiliary Heater
Fuse – S109 Fuel Pump Fuse – S81 (RS6 RHD )


8-slot mounting box

relay box in a6 c5

This relay box is located behind the central switchgear. Here is a diagram of it.

relay box a6 c5


1Relay for solenoid valves – ABS with ESP – J106
2Radiator fan relay (2nd speed) – J101
3Radiator fan relay – J26
Relay for pumping coolant after engine shutdown -J151
4Radiator fan switch relay – J138
5Not used
6Air suspension compressor relay – J403 (Allroad)
7Hydraulic pump relay – ABS with ESP – J105
8Coolant shut-off valve relay – J541
14Thermal fuse for driver’s seat adjustment – S44 (Allroad)
15Fuse for 12V connector – S184
16Thermal fuse for front power windows – S37
17Thermal fuse for rear power windows – S43
18ABS block fuse – S123
19Radiator fan fuse – S42
20Fuse for radiator fan control unit – S142
21Driver’s seat adjustment thermo-
fuse – S44 Radiator fan fuse – S42 (Allroad)
22Air Suspension Fuse – S110 (Allroad)
24Thermo-fuse for passenger seat adjustment – S80

Central switchgear

Central switchgear

CIA relay blocks

Circuits protected

1Horn relay – J4
2Relay X contact unloading – J59
3Reducing range hydraulic pump relay – J555 (Allroad)
4Fuel pump relay – J17 (petrol engines)
Glow plug relay – J52 (diesel engines)
5Wiper and washer relay – J31
6Wiper and washer relay – J31
ASteering column adjustment fuse – S275
BRear curtain fuse – S100
CFuse for alarm control unit II – S181 (taxi)
Fuse C – S204 (police vehicles)
Fuse for emergency exit rear cover – S195 (special vehicles)
Fuse for multifunction steering wheel control unit – S326

Main fuse box

Located on the left end of the dashboard under the protective cover.

real photo fuse box

Check the diagram description with the table on the back of the cover.

fuse block diagram a6 c5
fuse box diagram a6 c5

Protected components

No.Current consumer
15A Heated windshield washer jets, heated outside mirrors
210A Direction indicators
35A Headlight cleaners, lighting
45A License plate light
510A Heated seats, lamp control, catalytic converter, switch lighting, switches and outside mirror motors, airbag warning lamp, outside temperature indicator, air conditioning, permanent heating, rear curtain, sunroof, navigation system
65A Central locking system
710A ABS control unit, brake light and clutch pedal switches
85A Telephone, Telematik
910A Heated mirrors
105A Automatic headlight range control
1110A Cruise control with automatic transmission Multitronic
1210A Power supply for self-diagnosis system
1310A Stop lights
1410A Interior lighting, reading lights, warning lights, sun visor mirror, seat memory
1510A Instrument cluster, air conditioning, seat and mirror memory, pre-heating clock, navigation system
165A Electronic stability control
1710A Navigation system
1810A High beam right
1910A High beam left
2010 / 15A Dipped beam right, headlight range control right
2110 / 15А Low beam left, headlight range control left
225A Marker and parking lights, right
235A Position and parking lights, left
2425A Windscreen wipers, washer pump, time interval relay
2530A Ventilation system fan, air conditioner, constant heating, sunroof
2630A Heated rear window
2715A Steering wheel heating
2820A Fuel pump
2920 / 30A Electronic engine systems
3020A Tilting-sliding sunroof panel
3115A Reversing lights, cruise control, automatic transmission, auto-dimming interior rearview mirror
3220A Electronic engine management systems
3315A Cigarette lighter fuse Audi A6 C5
3415A Electronic engine management systems
3530A “Plus” continuous power supply to the trailer
3615A Fog lights, rear fog lights
3720A Telephone, radio
3820A Trunk lamp, central locking
3915A Alarm
4025A Sound signal
4125A Anti-lock braking system / electronic stabilization system
4225A Electronic stabilization system
435A Contacts S (radio)
4430A Seat heating

Fuse number 33 at 15A is responsible for the cigarette lighter.

13-slot mounting box

block location


13 relay box


1Horn relay – J4 ​​(telematics – USA)
2Alternator connection relay – J442 Anti-
theft alarm control unit – J85 (taxi)
Horn relay – J408 (police vehicles) Anti-
theft alarm relay, light changeover – J549 (special vehicles)
3Solar battery isolation relay -J309 Anti-
theft alarm control unit – J85 (taxi)
Horn relay – J408 (police vehicles)
Burglar alarm relay, high-beam warning – J461 (special vehicles)
4Starter lock
relay -J207 Starter lock relay and reverse light – J226
5Magnetic clutch relay – J44 Auxiliary heater
relay – J8
6Fog light relay – J5
Fuel pump relay – J17 (TDI engines)
7Multifunction steering wheel control unit – J453
8Multifunction steering wheel control unit – J453
9Lamp control device – J123
10Lamp control device – J123
11Control unit for folding mirrors – J351
12Control unit for folding mirrors – J351
13Servotronic control unit – J236
14Fuse taximeter – S182
Fuse E – S201 (police cars)
Fuse hydraulic pump relay – S279 (Allroad)
15Not used
16Burglar Alarm Fuse – S57 (Taxi)
Fuse B – S202 (Police Cars)
17Taximeter and burglar alarm fuse – S183 (taxi)
C fuse – S203 (police cars)
Walkie talkie fuse – S253 (special vehicles)
Fog lamp fuse – S28 (daytime running lights – Canada)
18Installed anywhere
Generator connection relay – J442 (special vehicles)
Anti-theft alarm control unit II – J430 (taxi)
Light alarm relay – J182 (police vehicles)
Solar battery isolation relay -J309 (taxi)

Mounting box in plenum box

block in the engine compartment


1Secondary air pump relay – J299 (RS6)
1aRadiator fan relay (Allroad) – J26
1bCoolant circulation relay after off engine (Allroad) – J151
Relay for auxiliary coolant pump – J496
2Secondary air pump relay – J299
3Motronic supply relay – J271 (petrol engines)
Diesel direct injection relay – J322 (diesel engines)
Relay, anti-lock device – J64 (automatic transmission – 01J)
coolant pump relay – J445 Coolant pump relay after off engine – J151 (RS6)
4aNot used
5Fuse for engine control unit – S102
Fuse for engine electronics (Allroad) – S282
6Not used (LHD vehicles)
Glow plug fuse – S125 (V6 TDI, V8 TDI
Glow plug fuse – S39 ( 4-cylinder engines) Radiator fan fuse – S94 (Allroad)
7Glow plug fuse – S39 (engines: V6 TDI, V8 TDI)
Secondary air pump fuse – S130 (petrol engines)
Auxiliary heater fuse – S62 (right-hand drive vehicles)
Not used (right-hand drive vehicles)
8Auxiliary Heater Fuse – S62 (LHD)
Not Used (LHD)
9Glow plug fuse – S125 (V6 TDI, V8 TDI
Glow plug fuse – S39 ( 4-cylinder engines) Radiator fan fuse – S94 (Allroad)
Coolant pump fuse – S78 (RS6)
Not used (right-hand drive vehicles)
10Fuel cooling pump fuse – S262
Fuse -1- (15) – S199 (automatic gearbox 01J)
Radiator fan control unit fuse – S142 (Allroad)
Not used (right-hand drive vehicles)

Separate fuses:
LHD vehicles:
– Auxiliary heater – S62 (from 2001)
Right-hand drive vehicles:
– Auxiliary heater – S62 (from 2001)
– Fuel cooling pump fuse – S262
– Fuse -1- (15) – S199 (automatic transmission 01J)
– Fuse for radiator fan control unit – S142 (Allroad)

Additional Information

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