The second-generation Audi A6 debuted in the spring of 1997. Built on the C5 platform, the body carried the factory designation 4B. Produced in sedan and station wagon (Avant) body styles, it later formed the basis for the Allroad quattro. Below are the fuse and relay box diagrams for second-generation Audi A6, Allroad quattro, and RS6 models (C5 platform) for model years 1999, 2000, 2001, 2002, 2003, 2004, and 2005.
Here you will find the locations and diagrams of the power distribution boxes. Fuses for key components, such as the fuel pump and cigarette lighter, are specifically highlighted.
Engine Compartment
The distribution box is located in the plenum chamber (water box).
| Diagram | |
|---|---|
|
|
| No. | Description |
| Relays | |
| 1 | Secondary air injection (SAI) pump relay - J299 (RS6) |
| 1a | Radiator fan relay (Allroad) - J26 |
| 1b | After-run coolant pump relay (Allroad) - J151 |
| Auxiliary coolant pump relay - J496 | |
| 2 | Secondary air injection (SAI) pump relay - J299 |
| 3 | Motronic ECM power supply relay - J271 (gasoline engines) |
| Direct diesel injection system relay - J322 (TDI engines) | |
| ABS relay - J64 (01J Multitronic CVT) | |
| 4 | Fuel cooling pump relay - J445 |
| After-run coolant pump relay - J151 (RS6) | |
| 4a | Not used |
| Fuses & Circuit Breakers | |
| 5 | Engine Control Module (ECM) fuse - S102 |
| Engine electronics fuse (Allroad) - S282 | |
| 6 | Not used (LHD) |
| Glow plug fuse - S125 (V6 TDI, V8 TDI) | |
| Glow plug fuse - S39 (4-cylinder TDI) | |
| Radiator fan fuse - S94 (Allroad) | |
| 7 | Glow plug fuse - S39 (V6 TDI, V8 TDI) |
| Secondary air injection (SAI) pump fuse - S130 (gasoline engines) | |
| Auxiliary heater fuse - S62 (RHD) | |
| Not used (RHD) | |
| 8 | Auxiliary heater fuse - S62 (LHD) |
| Not used (LHD) | |
| 9 | Glow plug fuse - S125 (V6 TDI, V8 TDI) |
| Glow plug fuse - S39 (4-cylinder TDI) | |
| Radiator fan fuse - S94 (Allroad) | |
| Coolant pump fuse - S78 (RS6) | |
| Not used (RHD) | |
| 10 | Fuel cooling pump fuse - S262 |
| Terminal 15 power supply fuse - S199 (01J automatic transmission) | |
| Radiator fan control unit fuse - S142 (Allroad) | |
Passenger Compartment
Main Fuse Box
Located on the left end of the dashboard (driver's side) behind a plastic access cover.
Sample layout configuration shown above.
| Main Passenger Compartment Fuse Panel Assignment | ||
|---|---|---|
|
||
| No. | Description | A |
| 1 | Heated washer nozzles, heated exterior mirrors | 5 |
| 2 | Turn signals | 10 |
| 3 | Lighting system, headlight washer relay | 5 |
| 4 | License plate lights | 5 |
| 5 | Instrument cluster, heated seats, cruise control DLC, bulb monitoring unit, catalytic converter sensor, switch illumination, gear selector display, airbag warning light, ambient temperature display, air conditioning system, auxiliary heater, rear window shade, power sunroof, parking sensors (PDC), navigation system | 10 |
| 6 | Central locking system | 5 |
| 7 | ABS module, brake light switch, clutch pedal switch | 10 |
| 8 | Cellular phone / telematics | 5 |
| 9 | Heated mirror element | 10 |
| 10 | Automatic headlight range control (LWR) | 5 |
| 11 | Cruise control (automatic transmission), Multitronic transmission control unit (TCM) | 10 |
| 12 | On-board diagnostic (OBD) socket / DLC | 10 |
| 13 | Brake lights | 10 |
| 14 | Interior lighting, reading lights, anti-theft alarm system, vanity mirror lights, seat memory module | 10 |
| 15 | Instrument cluster, air conditioning panel, seat/mirror memory module, auxiliary heater timer, navigation system | 10 |
| 16 | Electronic Stability Program (ESP) / ABS | 5 |
| 17 | Navigation system, adaptive air suspension / level control | 10 |
| 18 | Right high-beam headlight | 10 |
| 19 | Left high-beam headlight | 10 |
| 20 | Right low-beam headlight, headlight range adjustment | 15 |
| 21 | Left low-beam headlight, headlight range adjustment | 15 |
| 22 | Right side marker / parking light | 5 |
| 23 | Left side marker / parking light | 5 |
| 24 | Windshield wipers, washer pump, intermittent wiper relay | 25 |
| 25 | HVAC blower motor, auxiliary heater | 30 |
| 26 | Heated rear window, air recirculation flap | 30 |
| 27 | Heated steering wheel, rear window wiper (Avant) | 15 |
| 28 | Fuel pump, auxiliary fuel pump (diesel engines) | 20 |
| 29 | Engine Control Module (ECM) | 30 |
| 30 | Power sunroof | 20 |
| 31 | Reverse lights, cruise control, automatic transmission selector lever, OBD diagnostic socket | 15 |
| 32 | Engine Control Module (ECM) | 20 |
| 33 | Cigarette lighter (Audi A6 / Allroad quattro) | 15 |
| 34 | Engine Control Module (ECM) | 15 |
| 35 | Trailer towing socket / harness | 30 |
| 36 | Front fog lights, rear fog light | 15 |
| 37 | Radio, cellular phone system | 20 |
| 38 | Luggage compartment light, central locking | 20 |
| 39 | Hazard warning lights | 15 |
| 40 | Horn | 25 |
| 41 | ABS, Electronic Stability Program (ESP) | 25 |
| 42 | Electronic Stability Program (ESP) | 25 |
| 43 | Radio (Terminal S ignition input) | 5 |
| 44 | Heated seats, auxiliary heater | 30 |
Additional Relay Carriers
Located beneath the dashboard on the driver's side.
| Central Relay Carrier Assignment | |
|---|---|
|
|
|
|
| Fuses & Circuit Breakers | |
| A | Steering column adjustment fuse - S275 |
| B | Power rear window shade fuse - S100 |
| C | Anti-theft alarm control unit II fuse - S181 (taxi) |
| Special equipment fuse C - S204 (police vehicles) | |
| Emergency tailgate release fuse - S195 (special vehicles) | |
| Multifunction steering wheel control unit fuse - S326 | |
| Relays | |
| 1 | Dual-tone horn relay - J4 |
| 2 | X-contact load reduction relay - J59 |
| 3 | Low-range hydraulic pump relay - J555 (Allroad) |
| 4 | Fuel pump relay - J17 (gasoline engines) |
| Glow plug relay - J52 (diesel engines) | |
| 5 | Windshield wiper and washer intermittent relay - J31 |
| 6 | |
| 13-Slot Relay Carrier | |
|---|---|
|
|
| No. | Description |
| Relays | |
| 1 | Dual-tone horn relay - J4 |
| 2 | Generator cut-off relay - J442 |
| Anti-theft alarm control module - J85 (taxi) | |
| Siren relay - J408 (police vehicles) | |
| Alarm / emergency lighting relay - J549 (special vehicles) | |
| 3 | Solar sunroof isolation relay - J309 |
| Anti-theft alarm control module - J85 (taxi) | |
| Siren relay - J408 (police vehicles) | |
| Alarm / high-beam flasher relay - J461 (special vehicles) | |
| 4 | Starter interlock relay - J207 |
| Starter interlock and reverse light relay - J226 (automatic transmission) | |
| 5 | A/C compressor magnetic clutch relay - J44 |
| Auxiliary heater relay - J8 | |
| 6 | Fog light relay - J5 |
| Fuel pump relay - J17 (TDI engines) | |
| 7 | Multifunction steering wheel control module - J453 |
| 8 | |
| 9 | Bulb monitoring control module - J123 |
| 10 | |
| 11 | Power folding mirror control module - J351 |
| 12 | |
| 13 | Servotronic power steering control module - J236 |
| Fuses & Circuit Breakers | |
| 14 | Taximeter fuse - S182 |
| Special equipment fuse E - S201 (police vehicles) | |
| Hydraulic pump relay fuse - S279 (Allroad) | |
| 15 | Not used |
| 16 | Anti-theft alarm fuse - S57 (taxi) |
| Special equipment fuse B - S202 (police vehicles) | |
| 17 | Taximeter and alarm fuse - S183 (taxi) |
| Special equipment fuse C - S203 (police vehicles) | |
| Two-way radio fuse - S253 (special vehicles) | |
| Fog light fuse - S28 (daytime running lights - Canada) | |
| 18 | Auxiliary fuse slot (open position) |
| Generator cut-off relay - J442 (special vehicles) | |
| Anti-theft alarm control module II - J430 (taxi) | |
| Emergency lighting relay - J182 (police vehicles) | |
| Solar sunroof isolation relay - J309 (taxi) | |
| 8-Slot Relay Carrier | |
|---|---|
This relay carrier is located behind the central relay panel. |
|
|
|
| No. | Description |
| 1 | ABS/ESP solenoid valve relay - J106 |
| 2 | Radiator fan relay (speed 2) - J101 |
| 3 | Radiator fan relay - J26 |
| After-run coolant pump relay - J151 | |
| 4 | Radiator fan run-on relay - J138 |
| 5 | Not used |
| 6 | Air suspension compressor relay - J403 (Allroad) |
| 7 | ABS/ESP hydraulic pump relay - J105 |
| 8 | Coolant shutoff valve relay - J541 |
| 14 | Driver seat adjustment thermal fuse - S44 (Allroad) |
| 15 | 12V power outlet / cigarette lighter fuse - S184 |
| 16 | Front power window thermal fuse - S37 |
| 17 | Rear power window thermal fuse - S43 |
| 18 | ABS control module fuse - S123 |
| 19 | Radiator fan fuse - S42 |
| 20 | Radiator fan control module fuse - S142 |
| 21 | Driver seat adjustment thermal fuse - S44 |
| Radiator fan fuse - S42 (Allroad) | |
| 22 | Air suspension fuse - S110 (Allroad) |
| 24 | Passenger seat adjustment thermal fuse - S80 |
| 3-Slot Auxiliary Carrier | |
|---|---|
|
|
| No. | Description |
| A | Not used |
| B | |
| C | Auxiliary heater fuse 2 - S143 |
| Brake booster hydraulic pump fuse - S279 | |
| Fuel pump fuse - S81 (RS6 LHD) | |
| D | Auxiliary heater fuse - S109 |
| Fuel pump fuse - S81 (RS6 RHD) | |
| 1 | Low heat output relay - J359 |
| Brake booster relay - J569 | |
| 2 | Auxiliary heater relay - J8 |
| Solar sunroof isolation relay - J354 | |
| 3 | High heat output relay - J360 |