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.
Contents
Locations
- 3-slot mounting box
- 8-slot mounting box
- Central switchgear with relay box
- Main fuse box
- 13-slot mounting block
- Mounting block in plenum box
Before replacing a fuse, you must disconnect the corresponding load and turn off the ignition.
3-slot mounting box
Diagram
Designation
| 1 | Low heat output relay – J359 Brake servo relay – J569 |
| 2 | Auxiliary heater relay – J8 Solar isolation relay – J354 |
| 3 | High power relay -J360 |
| A | Not used |
| B | Not used |
| C | Auxiliary heater fuse 2 – S143 Hydraulic pump fuse (brake booster) – S279 Fuel pump fuse – S81 (RS6 LHD) |
| D | Auxiliary Heater Fuse – S109 Fuel Pump Fuse – S81 (RS6 RHD ) |
8-slot mounting box
This relay box is located behind the central switchgear. Here is a diagram of it.
Assignment
| 1 | Relay for solenoid valves – ABS with ESP – J106 |
| 2 | Radiator fan relay (2nd speed) – J101 |
| 3 | Radiator fan relay – J26 Relay for pumping coolant after engine shutdown -J151 |
| 4 | Radiator fan switch relay – J138 |
| 5 | Not used |
| 6 | Air suspension compressor relay – J403 (Allroad) |
| 7 | Hydraulic pump relay – ABS with ESP – J105 |
| 8 | Coolant shut-off valve relay – J541 |
| 14 | Thermal fuse for driver’s seat adjustment – S44 (Allroad) |
| 15 | Fuse for 12V connector – S184 |
| 16 | Thermal fuse for front power windows – S37 |
| 17 | Thermal fuse for rear power windows – S43 |
| 18 | ABS block fuse – S123 |
| 19 | Radiator fan fuse – S42 |
| 20 | Fuse for radiator fan control unit – S142 |
| 21 | Driver’s seat adjustment thermo- fuse – S44 Radiator fan fuse – S42 (Allroad) |
| 22 | Air Suspension Fuse – S110 (Allroad) |
| 24 | Thermo-fuse for passenger seat adjustment – S80 |
Central switchgear
Diagram
Circuits protected
| 1 | Horn relay – J4 |
| 2 | Relay X contact unloading – J59 |
| 3 | Reducing range hydraulic pump relay – J555 (Allroad) |
| 4 | Fuel pump relay – J17 (petrol engines) Glow plug relay – J52 (diesel engines) |
| 5 | Wiper and washer relay – J31 |
| 6 | Wiper and washer relay – J31 |
| A | Steering column adjustment fuse – S275 |
| B | Rear curtain fuse – S100 |
| C | Fuse 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.
Check the diagram description with the table on the back of the cover.
Protected components
| No. | Current consumer |
| 1 | 5A Heated windshield washer jets, heated outside mirrors |
| 2 | 10A Direction indicators |
| 3 | 5A Headlight cleaners, lighting |
| 4 | 5A License plate light |
| 5 | 10A 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 |
| 6 | 5A Central locking system |
| 7 | 10A ABS control unit, brake light and clutch pedal switches |
| 8 | 5A Telephone, Telematik |
| 9 | 10A Heated mirrors |
| 10 | 5A Automatic headlight range control |
| 11 | 10A Cruise control with automatic transmission Multitronic |
| 12 | 10A Power supply for self-diagnosis system |
| 13 | 10A Stop lights |
| 14 | 10A Interior lighting, reading lights, warning lights, sun visor mirror, seat memory |
| 15 | 10A Instrument cluster, air conditioning, seat and mirror memory, pre-heating clock, navigation system |
| 16 | 5A Electronic stability control |
| 17 | 10A Navigation system |
| 18 | 10A High beam right |
| 19 | 10A High beam left |
| 20 | 10 / 15A Dipped beam right, headlight range control right |
| 21 | 10 / 15А Low beam left, headlight range control left |
| 22 | 5A Marker and parking lights, right |
| 23 | 5A Position and parking lights, left |
| 24 | 25A Windscreen wipers, washer pump, time interval relay |
| 25 | 30A Ventilation system fan, air conditioner, constant heating, sunroof |
| 26 | 30A Heated rear window |
| 27 | 15A Steering wheel heating |
| 28 | 20A Fuel pump |
| 29 | 20 / 30A Electronic engine systems |
| 30 | 20A Tilting-sliding sunroof panel |
| 31 | 15A Reversing lights, cruise control, automatic transmission, auto-dimming interior rearview mirror |
| 32 | 20A Electronic engine management systems |
| 33 | 15A Cigarette lighter fuse Audi A6 C5 |
| 34 | 15A Electronic engine management systems |
| 35 | 30A “Plus” continuous power supply to the trailer |
| 36 | 15A Fog lights, rear fog lights |
| 37 | 20A Telephone, radio |
| 38 | 20A Trunk lamp, central locking |
| 39 | 15A Alarm |
| 40 | 25A Sound signal |
| 41 | 25A Anti-lock braking system / electronic stabilization system |
| 42 | 25A Electronic stabilization system |
| 43 | 5A Contacts S (radio) |
| 44 | 30A Seat heating |
Fuse number 33 at 15A is responsible for the cigarette lighter.
13-slot mounting box
Diagram
Designation
| 1 | Horn relay – J4 (telematics – USA) |
| 2 | Alternator connection relay – J442 Anti- theft alarm control unit – J85 (taxi) Horn relay – J408 (police vehicles) Anti- theft alarm relay, light changeover – J549 (special vehicles) |
| 3 | Solar 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) |
| 4 | Starter lock relay -J207 Starter lock relay and reverse light – J226 |
| 5 | Magnetic clutch relay – J44 Auxiliary heater relay – J8 |
| 6 | Fog light relay – J5 Fuel pump relay – J17 (TDI engines) |
| 7 | Multifunction steering wheel control unit – J453 |
| 8 | Multifunction steering wheel control unit – J453 |
| 9 | Lamp control device – J123 |
| 10 | Lamp control device – J123 |
| 11 | Control unit for folding mirrors – J351 |
| 12 | Control unit for folding mirrors – J351 |
| 13 | Servotronic control unit – J236 |
| 14 | Fuse taximeter – S182 Fuse E – S201 (police cars) Fuse hydraulic pump relay – S279 (Allroad) |
| 15 | Not used |
| 16 | Burglar Alarm Fuse – S57 (Taxi) Fuse B – S202 (Police Cars) |
| 17 | Taximeter 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) |
| 18 | Installed 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
Assignment
| 1 | Secondary air pump relay – J299 (RS6) |
| 1a | Radiator fan relay (Allroad) – J26 |
| 1b | Coolant circulation relay after off engine (Allroad) – J151 Relay for auxiliary coolant pump – J496 |
| 2 | Secondary air pump relay – J299 |
| 3 | Motronic supply relay – J271 (petrol engines) Diesel direct injection relay – J322 (diesel engines) Relay, anti-lock device – J64 (automatic transmission – 01J) |
| 4 | Fuel coolant pump relay – J445 Coolant pump relay after off engine – J151 (RS6) |
| 4a | Not used |
| 5 | Fuse for engine control unit – S102 Fuse for engine electronics (Allroad) – S282 |
| 6 | Not used (LHD vehicles) Glow plug fuse – S125 (V6 TDI, V8 TDI engines) Glow plug fuse – S39 ( 4-cylinder engines) Radiator fan fuse – S94 (Allroad) |
| 7 | Glow 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) |
| 8 | Auxiliary Heater Fuse – S62 (LHD) Not Used (LHD) |
| 9 | Glow plug fuse – S125 (V6 TDI, V8 TDI engines) Glow plug fuse – S39 ( 4-cylinder engines) Radiator fan fuse – S94 (Allroad) Coolant pump fuse – S78 (RS6) Not used (right-hand drive vehicles) |
| 10 | Fuel 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
Still have questions? Watch this video to make it clear exactly where these boxess and relays are located.
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Hello,
I own an Audi A6 C5 (2.4 V6 Benz+LPG) year 2002. My problem is related to your field of expertise.
The car have four doors, each door contains one white and one red light that lightens when opened. Next, in the trunk there are at least two lights, 1st light is located just a little to the left near the lock and the 2nd one is located right in the closer centre of inner trunk sky. (At this point I would like to apologize for not so technical describing).
Now, of all these 6 lights, only back doors lights are working as intended. Other ones (front doors , trunk 1 and trunk 2) sometimes or very rarely. I see lamps actually work so I believe its problem lies within fuse section.
And yet, when doors are shut, to turn on central and back-central inner sky lights I need to click the fore switch (the main one, operated by driver) to position 1, and then to open driver’s mirror cover to turn its bulb on, and then along with that bulb, those two sky lights are also turned on along, both of them. (Then I can safely cover the mirror back and close it). It’s the only way for me to keep the lights in the sky on if desired. The other way is when the key is out of ignition and back doors are open, any of them.
Turning the main switch back to position between 0 and 1 shuts off all the sky lights.
Now my question would be which fuses or relays to check or even to replace to see the result(s)? In Serbia I must wait 40-60 days for auto-electrician to solve it, because they’re so busy, I have never seen that in my life that every master is so busy. This is why I am asking you to help me just telling me which fuses and/or relays to check or replace. Thank you in advance, Branko Soskich