"http://wiki.answers.com/Q/How_do_you_find_why_the_lock_unlock_alrm_is_not_making_a_sound_when_remote_is_activated_in_a_Lexus_ES_300"
Lexus has to hook their computer to it to program the key to both lock/unlock and to start the vehicle.
Use your remote control to Unlock, Lock and Unlock again. It worked for my case very well.
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Part if the door handle pops off. Look under the dirt Handel and you should see it. Then use the key from the remote.
remove plastic cover next to driver door handle using the key in remote fob and then insert key into lock.
cr 1616
use the manual or ask lexus cherio
Unlock the drivers side door with the key and this will disable the alarm. Lock it with the key when you leave and the alarm will turn back on. Assuming factory alarm with no modifications.
instruction manual
You don't.
there is an small key inside the key less remote that comes out, use that to get in.
If you press the unlock button two times it should unlock all the doors.