I would probably think that somehow the beep got reset and now it is silent. One would know that the beep is silenced by when one hits the arm/disarm button and the lights still flash. Try calling Toyota's service dept. and they should tell you how to reprogram the alarm beep setting.
my mom has a 98 camry, and that thing doesn't beep sometimes, sometimes lets out a squeeky beep, sumtimes does what it should. it's weird, but it does always lock and unlock the doors! so that's good, i think your "beeper" may have got jacked up, make sure there is power going to it, maybe it needs to b replaced
i have this problem occcasionally...there should be a switch under the dash, near the driverside door (general area of where the Hood release is) try that switch. or, what happened to mine is the wire was cut (proly when i swithed out my batt) but anyways if that's the case, just solder or crimp them together
i think its the ground try and find a ground wire comming off of the alarm and it probobly is loose or fell off just screw it back in or find a new spot to put it . the same thing happened to my girls car and that fixed it and its been about a year now still workin
wat i did was unlock lock unlock and lock just keep doing it till you hear the sound i have VIper alarm so it mite be different if anything the amarn should have a number in the back you can call them and ask
i had the same problem. did you have your door open when you noticed the problem. this happen to me and i found out that when the door is open and you hit Lock, Unlock, Lock you will put it into valet mode. Valet mode just locks the doors and flash the lights. just open the door and hit Lock, unlock, lock and it should fix the problem.
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