![]() For the circuit board, use an old toothbrush with 99% rubbing alcohol. They all recovered :)įor your specific case, I'd try to scrub the corrosion off of the board and the battery contacts. 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. Putting it on a sunny windowsill would help. If not, give a full day of two to completely dry out. If you were able to use 99% rubbing alcohol, this should take less than an hour. Don't use rubbing alcohol if you weren't able to remove the battery! Also, this will remove any salts or contaminants that were in the water. It will wash the water away, and then evaporate very quickly. One good way is to dump rubbing alcohol (99%, not 70%) over the board. This is more difficult than it sounds, because it won't come out from underneath the chips on the circuit board. It's important to get the water off of the board quickly, and it will never evaporate when there's no airflow. Five minutes is way better than fifteen :) The longer you wait, the more likely that it can't be fixed. Here's what to do when a circuit gets wet: Turn the key fob over to reveal the battery compartment. But I've never heard of that happening with small coin-cell batteries.Īnyway, enough of the problems. Press this grey button to slide and remove the back cover from the remote key. In an extreme case, a battery will leak or explode. In addition to killing the battery, the current flow really speeds up the corrosion process. Severe corrosion can actually eat though the the metal, causing open circuits. It will also rule out any other problem with the first key, for example, water damage. This is especially common between pins of an integrated circuit, because they are so close together. Recommended video Use spare key: You can try starting your Highlander with its second key. ![]() The corrosion can be conductive, and so will cause permanent shorts on the circuit board. This is generally what kills the circuit. How To Replace A Toyota Keyless Car Fob Battery FIXED1T 16.7K subscribers Subscribe 244K views 4 years ago Please buy me a coffee link: If you like the. The metal parts of the circuit will corrode. ![]() This will cause it to fail, but seldom does any lasting damage. The battery voltage can short across to the wrong parts of the circuit. There are three major things that happen when you get a circuit board wet: Unfortunately, after all this time, it's kind of a long shot. NOTE: Toyota Rav4 - FCC ID and board # inside - both must match.If you can access the electronics soon after they get wet, the chances are pretty good to keep it working.
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