Rav 4 Mreg alarm

You need to have the codes read for the security. Could be the key, receiver, wiring,bad fuse, or module that has died. It takes a scanner to read security. I would start with the fuses. If I don't have the fuse diagram, I pull one at a time, replace it if it is bad. But I pull all them and relays. Doing this gets rid of corrosion problems also. I have fixed many cars just by pulling a good fuse and putting it back in. Corrosion...

why not get it fixed.
the security system is faulting
so get it fixed.
or if DIY person, get the FSM read that section
or google for 1hr on your car,
did you read this?

http://justgivemethedamnmanual.com/toyota/toyota-rav4-owners-manual/

have you tried both FOB's one in car at a time.?
after all , one might be stuck in PANIC mode (bad switch)
car came with 2 FOBS, ever have just 1, or bad things happen.
did you read page 184?

close all doors. Reconnect the battery. When alarm start sound - lock and unlock driver door with the key, not remote.

First check your fuel pressure it should be 44-50 psi with key on and the engine off.If its not within specs then replace the fuel pump.

Open the hood the battery is on the left side up near the windshield, there will be a small box with two tabs lift tab outward & the battery is there.If you have a alarm you will have to leave the drivers door open & turn the key to the on position so the alarm will not go off.

Im trying to replace my rear motor mount on my Rav 4...

yeah. disconnect the battery, put the key in the ignition and turn it to the ON position. leave the driver's side door open, and reconnect the battery. the alarm will chirp a few times while you're putting the battery back on, but this SHOULD work.

you might as well go ahead and take the battery out of the remote for the alarm as well, to make sure its not setting your alarm off as well. you can replace the battery in the remote once the battery is reconnected in the vehicle. the remote might need to be reprogrammed if the alarm goes off again, otherwise its time to go to the toyota dealership!

!!WARNING!! make sure the key isnt in the position to START the vehicle, you just want the key ON. make sure that nothing else in the vehicle is on, and also, be VERY careful when reconnection the battery, as it will spark when it makes its connection. if you have been charging the batter a lot, make sure to give the battery time to cool down, because when car batteries get hot, they emit hydrogen, which is explosive. this IS a risky move, but is the only thing you can do, unless you either install a kill-switch or charge the battery and drive to the dealership while the alarm is going off. sometimes, when you start the vehicle, the alarm will stop, but im assuming this isnt your case.

If your car has an alarm with a separate remote, it is a separate system and it is probably self-arming. When you lock the doors with the key central lock, the alarm gets armed by the RAV4 being OFF and the door locking action. When you unlock the doors with the key, the alarm is still armed because the key is not comunicating with the alarm just the cars factory keyless system.

You defintely need to get a remote for the alarm to disable it or uninstall the alarm altogether.