Take the 2-minute tour ×
Motor Vehicle Maintenance & Repair Stack Exchange is a question and answer site for mechanics and DIY enthusiast owners of cars, trucks, and motorcycles. It's 100% free, no registration required.

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?

share|improve this question
    
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. –  Paulster2 Jul 11 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 Jul 11 at 20:33
    
Gotcha ... doesn't sound too good for the key, in this case. Hopefully someone has something for you. –  Paulster2 Jul 11 at 20:37

2 Answers 2

up vote 3 down vote accepted

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.

share|improve this answer
    
Nice. This is also the way you fix a cellphone dropped in the toilet (or any other body of water). –  Juann Strauss Jul 14 at 9:50

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.

share|improve this answer

Your Answer

 
discard

By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.