1991 camry alarm won't let it start

Disconnect the battery, have the ignition key turned to the "on" position then reconnect the battery.

I just had the same prblem. Reconnect your alarm first of all. You need to use your key bob "remote" to deactivate the alarm before starting. It is a feature "good one" i might add that should someone try to steal it the jeep will not start until u deactivate it w theke bob.

The alarm system somehow got activated , this is usually because the battery becomes discharged or disconnected try doing this:
Remove the key from the ignition
disconnect the negative battery terminal
put the key back in and turn to ON
exit the truck and leave door open
reconnect the battery terminal
get in and leave door open, if the alarm horn stays off it should start.

alarm its self goosed may have to take it to an auto electrition to disconect the old alarm

Either unlock the drivers door with the key, or turn the ignition on and try to start the car. one or the other should disarm the alarm

it may be your alternator that is draining your battery and causing problems. I have replaced my alternator two years in a row on my 2003 Corolla...also having other electrical problems with the radio and cd player. I have been reading where this is a common problem :(

Sounds like you have a shorted wire causing a drain. I recommend disconnecting the alarm all together which should stop the short so battery can remain fully charged.

disable or remove the alarm and see if problem gone especially ifits an aftermarket fitment alarm system.sounds like this job is one for an auto elec.
have had central door lock modules cause this

disconnect the alarm system from under the dash.battery to starter direct will turn the engine over fine but ignition system still runs through your alarm system.It's also a theft prevent system so your car will not be stolen.The alarm went bad preventing your car from starting.That means putting the ignition wiring back to factory.

I put a new started in my 99 camry the alarm went off and I didn't know how to stop it ,now my car doesn't have any power the battery is new but its not giving my car any power.Help...