I have a 1999 Toyota corolla. During winter the auto theft alarm gets activated as soon as I try to open my car using the key. I don't know what to do and how to start the car?

You have to make sure it has spark plugs and a fuel pump and must work well. Reset Security System and engine immobilizer. Check for Diagnostic Trouble Codes.

How do i reset the toyota corolla anti-theft system?

Vehicle History https://www.vehiclehistory.com > questions > how-do-...
Apr 10, 2020 - Attempt a DIY reset by inserting the key in the ignition and turning to the "on" position, without cranking. Leave the key "on" for 10-15 ...

5 answers · Top answer: The anti-theft system of the Toyota Corolla works to disable the fuel injection and ignition of Your vehicle through the ECU if a security breach is detected. ...
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3 Ways to Reset a Factory Car Alarm

wikiHow https://www.wikihow.com > ... > Car Electronics
To reset a factory car alarm, first try pressing the "panic" button on your remote if you have one. If that doesn't do it, put your key in the driver's door in ...

Toyota Corolla Immobilizer

TechnicalDomain.net https://qcwo.com > technicaldomain > toyota-corolla-i...
Feb 1, 2010 - 2 - Push the red security button (picture above) twice. 3 - Now start the engine. What other users are looking for: toyota immobilizer reset ...

Have you changed the battery over on the key fob? If you key doesn't have a battery in it, then the chip in the key may be bad or the key may need to be re-synced with the cars ignition module.

sounds like you also killed the immobilizer too, now are immobile.
CRANKS BUT DONT START right, and IMMO blinks ?
the IMMO light tells you ,what ITS doing, watch it.
the thieft and immo are very complex in the toy world.
before hacking it , find out how,.... the top answer is , you cant.
so which is first. the thieft sys. or immo.?
first read this, after checking all fuses in both fuse boxes

http://qcwo.com/technicaldomain/toyota-corolla-immobilizer

dont loose the master, key or use id daily
dont have 2 keys in car. at same time.
dont have other keys on right blocking the magic RFID key.
dont mess with it, if you mess with it , it THINKS you are crook
so dont.
it may also IMMO lock out if the theft system is hacked.
ill let you goggle that.

I would change the battery and make sure it has a good charge. Or take that battery to auto parts store and have them test the battery to make sure it is good. If it is, have them do a fast charge. If that don't work I say you might have a grounding issue

change the set up in anti thief control module . use by toyota scaner

On some models you can disable the alarm after you connect the battery by locking and unlocking the driver door with the key.
I would disconnect the horn or pull the relay until you can get the alarm turned off.

Operation of the theft deterrent system is discussed in the 1999 Toyota Camry Owner's Manual beginningh on page 21. Unlocking the door with the key should disarm the alarm system. If it does not disarm when using the key, there are only two possibilities:

> You have an aftermarket alarm system installed in addition to the system tht was provided by the manufacturer and they are interfering with each other.

> OR

> Your vehicle needs service to correct the malfunction.

You might try unlocking the car from the passenger side or use the key to open the trunk first to see if this works. If it does, the switch inside the driver door is probably malfunctioning.

Locate the device that is attached to the trunk to detect opening and move it away from the door so that it is not activated. Or if it is a normally closed switch then just jump the wire going to it so it is always closed.

I am having the SAME problem with my 99 Corolla, Still searching for a way to disable the factory security system, for the last two years I have the vehicle hotwired through the headlights to start it. (1 wire to battery positive, 1 wire to starter hot lead, touch them together.) unfortunately this has proven very dangerous as the vehicle will start even in gear, and take off without a driver. additionally, because the alarm is going off continuously, the battery dies if not disconnected after every use. I found the fuse in the relay box that disbles the alarm, and the car starts fine, unfortunately, It it also the fuse for the alternator, so that solution will not work either. If anyone has found true way to disable the system, PLEASE offer your suggestions!

somehow the car when on valet mode, go to a alarm shop , they should be able to re arm your car without to much damage to your pocket, or read your cars manual, it might inform you on how to fix the problem.