This guide will detail how to replace the outer casing of a 2007 Toyota Highlander’s key fob, but can be used as a general guide on how to replace the outer casings of most car’s key fobs. Before performing the repair detailed in this guide, you should find the model’s replacement fob casing online. An example search could look like "[car make and model] [car year] key fob case." Make sure to compare measurements of your key case with the product description provided by the seller. Order this case, and when you have the replacement then perform the repair.
Tools other than a screwdriver can be used, but for safety purposes it is important to use a tool that is small enough to open the seam but not sharp enough to hurt yourself.
While it does take a somewhat large amount of force to open the case, it should not take more than you should be able to provide with just a tool. Too much force may damage the components, so be sure to be careful when prying.
The electronics need to be placed in the correct side of the key. This side should be the one you took it out of, or commonly the opposite side of the buttons.
Carefully close the new casing and ensure that there is not too much force required to close the case. The two sides should lock with a clicking sound. Make sure to check that the case does not open easily to ensure a successful repair.
If the two sides do not properly connect, the key may not be successfully reassembled. Make sure that the key does not reopen and it's reconstructed properly.