I believe the battery that controls the key entry system is kaput since none of the functions now work. Any advice on how and where to obtain a replacement battery, what type, and also, how to go about changing it. (The last part of the question may sound strange but I ruined another home electrical device by trying to replace the battery).
Thanks, Alan
You can purchase replacement batteries at Radio Shack, hardware store, drug store, or anywhere that sells button style batteries. According to the Lexus web site, replacement battery type is 3 volt Panasonic BR1216. I took a look inside my key and it has a CR 1616 battery, which is slightly larger than the 1216.
The easiest thing to do would be to go to a Lexus dealer and ask them to replace the battery for you, or you can replace it yourself if you have a small Phillips screwdriver. Remove the small Phillips screw on the side of the key that is opposite from the buttons and open up the key. The module underneath can be lifted out, and remove the 2 small Phillips screw on the module. Insert the replacement batter with the plus + side up.
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