Audi A4 B8 (2007 – 2015) fuse and relay

Comments 18

• 2010 Audi a4 b8, Fog lights stay on when car is off. I tried to turn the fog lights off by starting the engine and turning the light switch, but the fog lights stayed on. I went for a drive, 5 minutes into the drive, the horn turned on without me pressing it, and stayed on until the fuse burned out. I also lost power steering right after the horn started. I have disconnected the battery for now. what could have gone wrong in the car? would anyone be able to assist me?

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  • Hello did you find the problem ? My car is doing the same thing ! Thanks

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• Could be a short somewhere.

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  • I’ve got a 2009 audi a4 went out in it yesterday got back into the car now the ignition lights won’t come on windows won’t go back up

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  • I have a 2015 A4 Quattro. My passenger side headlight went out, so I switched it with the drivers side and it worked. When I put a testing light to it it lights up but the bulb still doesn’t.

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• May be shortage with ground & selector switch.

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• hi i am currently trying to replace relay 377 wiper control relay on my a4 b8 2009 saloon but cant find it would anyone be able to assist please

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• After driving through rain storm, my Audi A4 B8 crank but not start. Mechanic complete all relevant checks including firing, cleaning injectors, check fuel pump & filter, high pressure fuel pump, run diagnostics (no error codes on car), still the same problem, car won’t start. Anybody with the same situation? Please any help.

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• Hi, does anyone know where the stop/start chip is located on 2018 audiA4 .I need to replace .Thanks

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• BCM could be the problem. I had a similar issue. The BCM has some water intrusion which caused the board to short circuit.

  Run a scan and see what codes are revealed. Mine were all BCM related.

  Ordered a new BCM, had dealer reprogram. All is well

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• Is there any fuse that powerup up with reverse Gear?

  Since I want t power the reverse camera with reverse light.

  Or what cable can be used to connect for rever power?

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• Hi my heated wing mirrors are no longer working would anyone know if it’s a fuse and if so where would it be located A4 2013 model

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• does the Audi A4 2010 have a fuse for the washer motor, and where would it be?

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  • Same problem with finding fuse and relay for this in my 2011

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    • Same issue. My trunk lid, fuel filler cap, windscreen washer have all given up at same time. Can’t find fuses for any of these on my 2009 A4

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• Does anyone know where I can find the right fuse for the power steering, now I can barely steer the car. Or if anyone has experience what else could be wrong?
  The error code is:
  B200049 – Ctrl. module faulty
  static
  U140A00 – Terminal 30 Open circuit

  Audi A4 – 2013

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  • I have the same problem with my A4 2015. In about -25°C in Oslo area recently I first drove a short trip of about 15 min. Then, after a few minutes stop, I got red steering wheel and message “do not drive”, when starting the engine. I have checked the 5A fuse in pos. 15 at the Swichgear fuse board. That was my last hope, and my next step is to remove the steering gear to try to find the error.
    These are the errors, (the latter one was removed upon clearing errors):

    5258756 – Steering
    C10AC 07 [137] – Mechanical Failure
    [Blockieren der Lenkung]

    7343439 – Motor for Electric Power Steering
    C10AE 13 [137] – Open Circuit
    [Phasenunterbrechung mit Hilfe des GatedCounters erkannt (kritischer Fehler)]

    7343624 – Motor for Electric Power Steering
    C10AE 1B [008] – Resistance Too High
    [Relais-Fritting fehlgeschlagen]

    I have understood that this is a common failure on Audi electro mechanical steering gears, and a have read terrifying stories about huge costs related to repair.

    If you have progress in research on this, please let me know. I will keep you informed on any progress here.

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    • I solved the problem by replacing the complete steering rack. After a lot searching the net I understood that the rack, and most probably its control unit, may be damaged by operating in strong cold when the battery is not close to 100% charged.

      I found a used (not reconditioned) rack at Ragn-Sells for NOK 3500 and replaced it myself. Happy to avoid an extra 0 at the bill and a lot of waiting for some workshop to order from Germany and do the job.

      Before removing the old rack I measured exactly position of the wheels in straight forward position. I did this by measuring from a marked point on the curved suspension member and out to a small notch I made on the caliper, with 0.5 mm accuracy. Thus, I could obtain the same wheel alignment without need of a costly trip to workshop.
      Final calibration (by Ross-Tech VCDS); first Steering wheel G85 Basic Settings and then Steering rack Basic settings for resetting end stops. (The Ross-Tech procedure for steering wheel rotation is missing an important point: When engine is running, press brake pedal and engage a gear before turning the wheel.)

      Now I am just waiting nervously for the next red lamp and buzzing sound, giving me new challenges in the garage.

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