2004 Sienna repeatedly locks and

Have you checked the hood switch?How about all the door jabs,to see if any of them are bad,or came unplugged ,and are they grounding on the body inside the door jam?Check the rear hatch also,all the door jabs.These are the little buttons that push in to cut the circuit off.Also,have you tried to turn them off with the key,in the door?Look inside the door on the drivers side,and look for a problem with the switch on the door actuator(lock).There will be a contact switch on the door lock actuator,that trips the alarm on,and off.I ask these questions to make you think,and act on the suggestions,not that I need an answer,but for your benefit.I hope this all helps,and if so,please let us know,thank you.

It sounds like you had an aftermarket alarm installed that needs to be repaired or replaced. If you have had an alarm installed locate the main power wire for the alarm and remove the in-line fuse. This should solve the problem. If you have an alarm that was installed by the manufacturer it is most likely incorporated into the ECM which is going to be a problem. You will need to take the vehicle to the dealer and have the ECM checked for fault as this would not activate your Check Engine light. An ODB II code reader may show you a fault code even without the Check Engine light being on. I hope this helps.