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D/C cut, short pin dome fuse

Discussion in 'Gen 3 Prius Technical Discussion' started by Georgina Rudkus, Dec 22, 2020.

  1. Georgina Rudkus

    Georgina Rudkus Senior Member

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    This is the fuse or connector that is not installed when Toyota/Lexus leave the factory. It is usually installed by the longshoremen who drives the car off the ship or at the regional distribution center like Southeast Toyota.

    Removing it disabled Smart Key, the radio and all the parasitic current drains.

    The fuse is usually located on the underhood fuse block.

    Here is a link to the location to the electrical system of the Gen 3 Prius. Nice charts of ECU and other electrical component locations, as well as information on many other cars.

    Toyota Prius (XW30) (2009-2015) Fuse Diagram • FuseCheck.com

    The SHORT PIN is not a fuse and installed in position #16 in the underhood fuse box.

    It disconnects passenger compartment fuse 1 & 2; underhood fuse 10 and 25 all at the same time.
     
    #1 Georgina Rudkus, Dec 22, 2020
    Last edited: Dec 23, 2020
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  2. PriusCamper

    PriusCamper Senior Member

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    Is there greater context to this post? I think I'm missing something here? You're pointing this out, yet I'm not sure why? Does it fail for people? Is it a good thing to pull when you put a car in storage? All of the above?

    Doesn't seem like it's very easy to access from the diagram?
     
    #2 PriusCamper, Dec 22, 2020
  3. Georgina Rudkus

    Georgina Rudkus Senior Member

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    It's a one connector option to eliminate drain to the 12 volt battery in storage.

    Really hard? Open the hood, pull the cover off the fuse box. Pull out the SHORT PIN in position #16.

    Smart Key, radio, dome lights and lighter power sockets won't work, but you can still get in with the insert key and start the car with the back of the fob on the power switch.
     
    #3 Georgina Rudkus, Dec 22, 2020
    Last edited: Dec 23, 2020
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  4. Mendel Leisk

    Mendel Leisk EGR Fanatic

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    I noticed your similar 4th gen thread first, interesting. So for 3rd gen it's this:

    upload_2020-12-23_7-20-59.png

    That IS easier than disconnecting the neg cable, say while doing brake work. Maybe possible to install a more convenient "kill switch", if you could trace a wire leading to that "fuse".

    Too, just like any disconnect, you'll lose trip meters, radio presets and so on. It'd be SO nice, if Toyota would make this more convenient to do, AND had installed some sort of flash memory, to avoid the memory losses as much as practical.
     
    #4 Mendel Leisk, Dec 23, 2020
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  5. PriusCamper

    PriusCamper Senior Member

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    Is 2nd Gen Prius the same?
     
    #5 PriusCamper, Dec 23, 2020
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  6. Georgina Rudkus

    Georgina Rudkus Senior Member

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    #6 Georgina Rudkus, Dec 23, 2020
    Last edited: Dec 23, 2020
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  7. ChapmanF

    ChapmanF Senior Member

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    The 100 amp DC/DC fuse in gen 2 is the fusible link protecting the 12 V battery cable and DC/DC converter. It isn't any separate thing you can easily pull out; it is one of the links in the long white fusible link block, only replaceable as a whole, by lifting it up and undoing a bunch of plugged-in and bolted connections.

    Weirdly, the wiring diagram for gen 2 does picture all of the individual links in that thing as if they were separate fuses. Bit of a let-down to anybody who sees one of those in the diagram and thinks "oh, I'll go try changing that."
     
    #7 ChapmanF, May 18, 2024
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