Factory alarm beeps?

[Bitter]

Hey all, on my 00 Celica with the factory alarm it beeps. I know it should beep and its normal, but it also does different beeps. let me try to explain.

hit Lock on the fob and it beeps once and locks.
hit Unlock on the fob and it beeps twice and unlocks drivers door, hit again and it beeps twice again and unlocks all doors.
those are normal beeps, shrill high pitched beeps
but sometimes...

it beeps in a different lower tone, more of a boop than a beep.

once in a while i'll hit lock and it'll boop or it'll beep boop. once in a while it does the same when i hit unlock, beep boop or boop boop.

whats that all about?

[falnfenix]

it could be the alarm siren is starting to die. hell. mine (Viper alarm) will occasionally just not beep at all.

[Bitter]

it doesnt sound weak, its a distinctly different beep and will do it repeatedly...but i don't know what its telling me.

[ajenright]

if it is stock, check the manual. if theres nothing there about the problem then sounds like either (A) your stock siren is going bad (B) you have an aftermarket siren connected to a factory alarm and may not be recieving enough voltage to complete its full chirp (C) you have an after market alarm and the siren is either going bad, has a bad connection, or is not recieving enough voltage due to loose wires or bad connection. either way i would first find out if your siren is stock or factory (or possibly both which could also cause the problem) then use an ohm meter to check to ensure 12volts during chirp. if problem persists, replace siren. one last possible problem could be water in the siren if it is facing up or has any way of getting splashed. just find the noise and go from there. Good Luck!