Alarm keeps sounding and blue light is flashing on dash board, if I close the door the alarm starts all over again. The alarm sounds very weak and weird. Car won't start,

That sounds like a low voltage problem. Charge battery (in the trunk) and clean cable ends.

Anti-theft system can keep vehicle from starting , Alarm is for vehicle content theft , open door without key alarm sounds (horns) ! PATS - passive anti theft system PATS enables and disables the engine from starting ,it will not cause the engine to die ! You have some other kind of problem ! If the vehicle engine doesn't turn over an red light on top of dash flashes fast ,then you have anti-theft system problem !
PATS differs from the perimeter anti-theft system in that PATS enables and disables the engine from starting. If equipped, the perimeter anti-theft system protects the perimeter of the vehicle (doors, hood and trunk) and sounds an alarm.

Is it a small light somewhere on the dashboard? I'm not familiar with that car, but any vehicle I've had with an alarm has a blinking light to warn you/intruders that there is an alarm on the vehicle. Check your owner's manual for more info.

Focusing on switches: Start with the door switches. Pull the fuse for the dome lights. Reset the alarm. Does it sound off? The alarm feeds off the dome light fuse. Driver door is first: Often they wear out first and give us grief like this. Unscrew and disconnect the switch first. Replace the fuse. Carefully close the door so you don't loose the wire in the frame(attach a string to it so you can fish it back out if it falls in). Reset the alarm. Does it sound off or not? If it does, it is other than the switch or the passenger door switch (if a 2 door or 2 other passenger switches if a 4 door). Repeat process until the switch is found or all are eliminated. Switches are cheap, so replacing them will not break the bank. Disconnect the fuse again, unscrew the bad switch. Unplug it. Plug in the new. Screw it back in place. Reconnect the fuse and try it again. Repeat as needed until you have either found it or just limited your search area. Most often you will stumble upon it- chaffed wires, look plugs, bad switches). Yes, there is more, but I see this as the usual suspect. If you go back into the alarm, disconnect the alarm first, then observe the dome lights with the fuse in. It just may be a faulty control in the alarm, which is out of my territory. Let us know what you find, but start with the smallest things first. Good Luck!

your wire has come off door inside the door try unpluging fuse or the noise alarm under dash you need to replace the wires inside the sliding door to get it to close right again they have got tangled some how and tore loose.

It is a factory alarm put the key in the driver door unlock the door and try it again should take care of your issue.

It can be any of the car doors not got properly locked or the door is locked but the switch is not sensing the door locked. Open and close each door again properly.

Or else its problem with any of switch wiring getting in contact with alarm wiring causing it to happen.

And last thing alarm connections need to be inspected. It's getting short somewhere in between.

There are few help links with solutions, to troubleshoot these types of problems. I suggest going through these links.

Click the link below: ------

Volvo car alarm keeps going off for no reason

http://technoanswers.blogspot.in/2012/07/volvo-car-alarm-keeps-going-off-for-no.html

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Alarm keeps going OFF

http://technoanswers.blogspot.in/2012/07/alarm-keeps-going-off.html

--------------

2009 Toyota Camry: Hood Switch causing Alarm to go OFF?

http://whatisbyme.blogspot.in/2012/04/2009-toyota-camry-hood-switch-causing.html

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Ford Pickup Alarm will not disengage?

http://technoanswers.blogspot.com/2012/01/ford-pickup-alarm-will-not-disengage.html

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Mitsubishi Diamante: Factory Security Alarm will not go Off

http://www.howtorepairguide.com/2012/11/mitsubishi-diamante-factory-security.html

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Toyota Avalon Factory Alarm will go off?

http://repairhelpcenter.blogspot.com/2012/01/toyota-avalon-factory-alarm-will-go-off.html

----------

Chevrolet Tahoe Hood open warning on dash and alarm sounds?

http://schematicsdiagram.blogspot.com/2011/12/chevrolet-tahoe-hood-open-warning-on.html

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These details will help.

Thanks.

CAR ALARM ISSUES

It can be any of the car doors not got properly locked or the door is locked but the switch is not sensing the door locked. Open and close each door again properly.

Or else its problem with any of switch wiring getting in contact with alarm wiring causing it to happen.

And last thing alarm connections need to be inspected. It's getting short somewhere in between.

There are few help links with solutions, to troubleshoot these types of problems. I suggest going through these links.

Click the link below: ------

Volvo car alarm keeps going off for no reason

http://technoanswers.blogspot.in/2012/07/volvo-car-alarm-keeps-going-off-for-no.html

------------------

Alarm keeps going OFF

http://technoanswers.blogspot.in/2012/07/alarm-keeps-going-off.html

--------------

2009 Toyota Camry: Hood Switch causing Alarm to go OFF?

http://whatisbyme.blogspot.in/2012/04/2009-toyota-camry-hood-switch-causing.html

----------------

Ford Pickup Alarm will not disengage?

http://technoanswers.blogspot.com/2012/01/ford-pickup-alarm-will-not-disengage.html

------------

Mitsubishi Diamante: Factory Security Alarm will not go Off

http://www.howtorepairguide.com/2012/11/mitsubishi-diamante-factory-security.html

------------

Toyota Avalon Factory Alarm will go off?

http://repairhelpcenter.blogspot.com/2012/01/toyota-avalon-factory-alarm-will-go-off.html

----------

Chevrolet Tahoe Hood open warning on dash and alarm sounds?

http://schematicsdiagram.blogspot.com/2011/12/chevrolet-tahoe-hood-open-warning-on.html

-----------

These details will help.

Thanks.

You need to find the black push button called the valet button. That is the overide. Get in the car turn the key to IGN as the alarm is going off and then you have either 5 or 10 seconds to push that button once and then 2-5 seconds later the alarm is shut off. To put the car into valet mode which means no alarm at all you put the key to IGN push that button once then pull key out at which point the blue light should turn solid blue.

Or option two is you open a door and hit the lock, then unlock, then lock button again on the remote and the blue led will be solid which means no crazy alarm.

you may have to disconnect the battery for a minute or so ,this will reset the alarm. check your remote it does have a battery in it. otherwise you have to look for a fuse somewhere under the dash close to the fuse box.each one is diff. depending if it original toyota or aftermarket alarm.