Lost keys for chevey truck 2000 utility truck 350 chevey truck need to know how to disable factory alarm system to start the truck

to reprogram new key first you need to use 2 factory program keys.place first factory key in the ignition first turn ignition on for 3 seconds. then turn off ignition then install second factory in the ignition on position for 10 seconds.when immobilizer warning lamp begins to flash a acoustic signal is emitted.within 60 seconds. switch ignition off and remove key.then insert new key and switch on for 10 seconds a acoustic signal is emitted and immobilizer warning lamp remain illuminated for 3 seconds indicating programming completed.if all fails dealership has to reprogram new keys.

this is a long shot, put the key in the driver door, turn to unlock then try to start the car, some systems disarm when the key is used to unlock the car.

Insert the key in the ignition.
Turn the key quickly from the "Run" position to the "Off" position five times.
Turn the key to the "Start" position and start the car. This will disable the alarm and allow you to start the car again.
Read more: http://www.ehow.com/how_7440586_disable-factory-toyota-alarm.html#ixzz2cKir9i5LWorked for me.

Yes the truck came with a stock antitheft system. That IS what the security light is about. Check out this link. Everything you need to know is there.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

If you have the factory alarm system, you can put your key into either door and lock and unlock the door, that signals the computer to deativate the alarm. If you have an aftermarket alarm system installed, it will have to be removed and the wiring that the alarm ties into must be restored to factory design.

lock your doors and close it wait till alarm resets and then unlock door with key and this should take care of you problem

If it is a factory alarm, you can have your anti theft disabled at the dealership.

you HAVE to get a remote and unlock the car.the dealer may be able to turn it off with the obd2 system,you have to call subaru.

I would try replacing your key. If its worn down that will happen.

for a factory alarm the only way is to lock/unlock doors(with key) unless some one knows how to disable the alarm altogether. if alarm is not factory just find the box and remove alarm system (you may need to reconnect some wires if it has starter disable as a feature)