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  1. #1
    Junior Member One Ring
    Join Date
    Aug 27 2022
    AZ Member #
    793150
    Location
    Idaho

    TCU and fuse locations on an 8V

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    Anyone know where the TCU is located? How about the fuse for the TCU? I have the wiring diagram and despite spending a good deal of time going through it I can't seem to locate either. It says the TCU should be under the driver's fender, however, the washer fluid tank is here. Also, it says fuse 13 in the fuse box B is for the transmission and control unit, however, there is no fuse 13 there?

    The issue I'm dealing with is a transmission module that won't communicate. I'm wanting to check if power is going to it.

  2. #2
    Junior Member One Ring
    Join Date
    Aug 27 2022
    AZ Member #
    793150
    Location
    Idaho

    Would anyone be willing to take a picture of fuse box B with the lid off? It's the box in the engine bay next to the ECU. I think I may have one or more missing fuses from the previous owner.

  3. #3
    Junior Member One Ring
    Join Date
    Aug 27 2022
    AZ Member #
    793150
    Location
    Idaho

    Quote Originally Posted by Swimbait View Post
    Would anyone be willing to take a picture of fuse box B with the lid off? It's the box in the engine bay next to the ECU. I think I may have one or more missing fuses from the previous owner.
    I was able to answer this question by pausing and zooming in on the backyardboyz video of him disassembling the fuse box. If anyone else ever cares, mine matches his. I am frustrated with the Audi wiring manual containing every variant of A3/S3/RS3 all in the same manual, it makes it really confusing and in this case it is flat out incorrect, there is no fuse 13 on the RS3 even though they have no indication of that in the annotations.

  4. #4
    Junior Member One Ring
    Join Date
    Aug 27 2022
    AZ Member #
    793150
    Location
    Idaho

    In the spirit of replying to my own threads. I did fix the issue. Audi decided to use the same 8-pin male connector on either side of the frame rail, one to plug into the harness that goes into the transmission, the other I don't even know where it goes as of yet. The correct plug has 8 wires in it and the wrong one has 6 wires. When I was tracing the harness to look for damage. Hopefully I didn't fry anything, but the car at least is now running and communicating with the transmission.

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