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Turn key over so the Lexus emblem is visible on the back. Above where the metal key goes into the plastic is a small screw - find a screwdriver small enough to unscrew this. Once the screw is out, pull plastic backing away from metal key and up. After shell is opened, you will see the housing for battery and buttons. There are a couple of possibilities for the plastic that houses the battery:
1. The housing has 2 small screws that must be taken out in order to get to the battery. Take these out, lift off the small plastic cover, and continue to replace the battery - which should be CR2016 3V. Put everything back together.
2. The housing has no screws to take out. Instead, the housing is opened using a coin or flathead screwdriver (directions on how to take the cover off will be on the plastic itself). Replace battery and you're finished.
Once battery is replaced, make sure the battery is good by pressing the lock or unlock button and watching for the small red light to flash when button is pushed. Red light is located next to the lock/alarm button.
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CR1616
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