The key has a button which controls the locks on the doors, press once for drivers door and other doors, if key does not work check battery in key.
hit the lock button twice
I had to go to a Lexus dealer for mine. The keys are lazer cut. Cost me 60.00
Car alarm in Lexus ES300 started going off at random when car was parked, not running. I changed the key fob battery (flat watch battery) with a new battery and it fixed the problem.
If you press the unlock button two times it should unlock all the doors.
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To disable the alarm on a 1999 Lexus ES300, you can typically use the key fob to unlock the driver's door, which should deactivate the alarm. If that doesn’t work, insert the key into the ignition and turn it to the "On" position without starting the engine; this can also reset the alarm. If the alarm continues to trigger, disconnecting the car battery for a few minutes may help reset the system. Always consult the owner's manual for specific instructions related to your vehicle.
This link will show you how: http://www.youtube.com/watch?v=Za7pCdUde3U
The amount that a Lexus dealership charges to make an additional key for a Lexus car depends on the year and model of the car.
The amount that Lexus charges to make a new Lexus car key varies by year and model of the car and by dealership.
Lexus has to hook their computer to it to program the key to both lock/unlock and to start the vehicle.
There should be a little Phillips screw on one side of the plastic of the key toward the bottom. Just unscrew it and pry it off with your nail and replace the battery with what is in there, it is probably a cr 2032.