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I have a Toyota Camry 2011 and two remote keys. One of the keys was soaked with water two years ago. Of course, it is not working. I went to a dealer and they failed to recover it.

Is there something I can try to fix it myself?

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    What did the stealership try which didn't work? I mean it could be something as simple as a new battery and cleaning the contacts.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jul 11, 2014 at 20:27
  • It dropped into deep water for several hours. I just handed it to the dealership and they returned it to me since they could not figure it out. I guessed that the component was damaged. New battery is still not working.
    – Love
    Commented Jul 11, 2014 at 20:33
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    Gotcha ... doesn't sound too good for the key, in this case. Hopefully someone has something for you.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jul 11, 2014 at 20:37
  • I am trying putting my keys in rice for 1-3 days. We'll see how it works, I guess. That is one thing people do with cell phones, so I think it would work with electronic keys and fobs. Or maybe try a "Cell phone emergency kit" on it, I bought one in a mid-sized city and I think it was at an office supply store.
    – user35578
    Commented Feb 15, 2018 at 1:20
  • I suggest that you dont take a key fob or remote into the dealership... They know absolutely nothing about electronically engineering, most likely they'll just use improper cleaners and try a new battery, which may or may not work, if it doesnt work, they'll just re-program a new remote for an enormous price tag... if you dont have a oscilloscope and a multimeter then take your device into a computer store and have them test out the components on the logic board, They can test, alter and replace any parts needed if they're experienced enough and not complacent
    – user38183
    Commented Jul 22, 2019 at 0:51

7 Answers 7

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If you can access the electronics soon after they get wet, the chances are pretty good to keep it working. Unfortunately, after all this time, it's kind of a long shot.

There are three major things that happen when you get a circuit board wet:

  1. The battery voltage can short across to the wrong parts of the circuit. This will cause it to fail, but seldom does any lasting damage.

  2. The metal parts of the circuit will corrode. This is generally what kills the circuit. The corrosion can be conductive, and so will cause permanent shorts on the circuit board. This is especially common between pins of an integrated circuit, because they are so close together. Severe corrosion can actually eat though the the metal, causing open circuits.

  3. The battery will start draining rapidly. In addition to killing the battery, the current flow really speeds up the corrosion process. In an extreme case, a battery will leak or explode. But I've never heard of that happening with small coin-cell batteries.

Anyway, enough of the problems. Here's what to do when a circuit gets wet:

  1. Take care of it immediately. The longer you wait, the more likely that it can't be fixed. Five minutes is way better than fifteen :)

  2. Remove the case. It's important to get the water off of the board quickly, and it will never evaporate when there's no airflow.

  3. Remove the battery, if possible.

  4. Get the water off of the circuit. This is more difficult than it sounds, because it won't come out from underneath the chips on the circuit board. One good way is to dump rubbing alcohol (99%, not 70%) over the board. It will wash the water away, and then evaporate very quickly. Also, this will remove any salts or contaminants that were in the water. Don't use rubbing alcohol if you weren't able to remove the battery!

  5. Let it dry. If you were able to use 99% rubbing alcohol, this should take less than an hour. If not, give a full day of two to completely dry out. Putting it on a sunny windowsill would help.

  6. Put it all back together.

I've done this with a half-dozen usb keys, a rental car key (that I swam with in Hawaii!), and the guts of a remote-controller helicopter. They all recovered :)

For your specific case, I'd try to scrub the corrosion off of the board and the battery contacts. For the circuit board, use an old toothbrush with 99% rubbing alcohol. For the battery contacts, you can be more forceful :)

Good luck.

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    Nice. This is also the way you fix a cellphone dropped in the toilet (or any other body of water).
    – Captain Kenpachi
    Commented Jul 14, 2014 at 9:50
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    (or any other electronic device)
    – Zero
    Commented Jun 10, 2016 at 0:58
  • My wife put her 2008 Prius key fob through the wash, and it no longer worked. Quotes for replacing it ranged from 414 NZD to 795 NZD. Two weeks later I opened it up, cleaned the corrosion off the board with a toothbrush and isopropyl alcohol, and replaced the battery – and it worked! Thank you for the instructions! 😀
    – Ian Viney
    Commented Apr 24, 2023 at 0:30
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I accidentally ran the smart key for my '09 Jaguar XF supercharged sedan through the washing machine once. It was submerged in water for about 10 minutes until I found it. I was able to fix it by opening the shell and removing all the contents. A ran a blow dryer over all the pieces until they were completely dry (at least they appeared to be) before putting them back together, and it worked.

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Hair dryer played over opened key with battery removed brought mine to life without needing to replace battery. This was about 3 hours after it had come through the washing machine.

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I accidentally put my bf car krys into washing machine and washed it. We open it and used blower to dry it up and it works again

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One thing to consider before you go too deeply into this resurection effort. You can buy replacements on eBay for very little money (I got mine for $20 US) and the steps to marry it to your car are available online. The Toyota dealer wanted $80 just to program it. There are options to just replace it that are cheap enough that it's not worth the effort to resurrect this.

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Put mine in the washing machine...discovered it an hour later after I took it out of wash to place in dryer.....so I shook water out of it, then removed cover and dried with q-tip....put it back together and placed in jar of rice for 30 minutes and it is working.

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If your remote key have battery then pull it out fast. The other thing you can use your vacuum cleaner. You can try to get as much of that moisture out as possible. Hope this information will help you.

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