Changing all the ECUs and Key from wrecked Prius into a different prius with lost key (not working!)

Discussion in 'Gen 3 Prius Main Forum' started by MilkyWay, Jul 13, 2021.

  1. MilkyWay

    MilkyWay Active Member

    Joined:
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    Vehicle:
    2007 Prius
    Model:
    II
    Mechanic said:

    "Key n module work in new Prius [one with lost key] but won't ready light have to look into further"

    Thinks there may be a couple modules buried in instrument panel?

    Said: "Only switch smart key module. Also have power management module , pcm, and tps. All behind glovebox...fyi original smart key module was red this one blue"

    Any insight as to what may need to be changed or done to get this to work. The car/key/computer should think it is from the wrecked car/key/computer which worked fine before and after the wreck.

    Long story short: What all needs to be swapped over so that it works? The only thing he changed was the "smart key module"

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  2. ChapmanF

    ChapmanF Senior Member

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    This sounds like a "carefully read the Repair Manual (more info)" kind of project.

    Once one is signed in to TIS (where the Repair Manual can be accessed), there is apparently a bunch of additional information available too, by selecting the "Technical Training" (TT) tab and searching for a keyword T973B.

    sk.png

    It looks to me like that table was originally made for some car that used a steering lock, where a Prius (except Gen 1) uses the transmission lock instead, so in place of the "Steering Lock ECU" one should probably read the Transmission Control ECU.
     
  3. PriusCamper

    PriusCamper Senior Member

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    Here's what your Google search needs to look like if you want to learn everything possible about how to deal with this situation:

    Screenshot from 2021-07-13 12-21-58.png
     
  4. Johnny Cakes

    Johnny Cakes Senior Member

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    Pro tip:

    Based on the rolling papers in the background, might want to wait until after the job is finished.
     
  5. MilkyWay

    MilkyWay Active Member

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    2007 Prius
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    LOL --- It's fixed. Needed couple other of the ECUs.

    Got lucky/unlucky. Gen 3 was totalled a few days ago so he stripped all the parts (he put a 2016 gen 4 engine in it a few months ago only has 60k miles). So that will sit aside until the next gen 3 motor blows.

    Then bought an inop (due to no key) gen 3 that arrived today. And was able to use the ECU/keys from the wrecked one.

    Many years ago had issues with key fobs (on gen 2s) and stumbled across an eBay listing that including the ecus, keys, even the door handle so when you approach it unlocks via proximity. The whole set was like $120 to $150. So that is how I had the idea of doing it.

    It is way cheaper to just swap it all over than to pay the dealer or locksmith for a new key fob. They want about $350 on a gen 2 last I checked.

    (I am aware of "the chicken dance" and have done that --- but you cannot do that when the buttons are all smashed in and frozen and don't work on the original key fob....And sometimes you don't gain the smart functionality like proximity unlock and proximity starting doing the chicken dance.)
     
  6. MilkyWay

    MilkyWay Active Member

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    Vehicle:
    2007 Prius
    Model:
    II
    No fault insurance so they don't pay a penny.

    Parted it down. Saved a lot just on the key trick for 1 Prius and was able to make another prius whole (the one hit front left --- which also used airbags, seat belt, 12V, and hybrid). And tons of parts left over including a gen 4 engine. Pics a little blurry cause were screenshots of a video he sent me.

    Was rear-ended air bags did not deploy.



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