I can't start my 2002 chevy trailblazer after battery change. my keyless entry is damage and i fear it is the anti theft security system not allowing it to kick over, any suggestion to start?

Hello Cathy

It does indeed have keyless entry. It needs reprogramming when you get a new remote. Also if you disconnect the battery. Usually a local car alarm fitting shop, or an auto-electrician will do it. Plus of course a Ford dealership.

https://www.google.com/search?q=Keyless+Entry+Remote+System+1999+Ford+Windstar

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Chevy has an anti theft device that can trip because the computer under the seat (drivers side) gets moisture from snow and rain which causes the connection to rust and it sets off the anti theft system... you need to get that replaced and there is no way to fix it... had that happen on my 2009

If is the original key fob, you may need to reprogram it

anti theft light should blink every few seconds.

try disconnecting the battery for 15 minutes.

Anti-Theft-Perimeter The perimeter anti-theft system consists of the following components:

• anti-theft indicator (THEFT)
• remote anti-theft personality (RAP) module
• hood switch
• keyless entry remote transmitter
• deck lid ajar switch

NOTE: The remote entry features will not function when the ignition switch is in the RUN or ACC position.
Up to four keyless entry remote transmitters (15K601) can be programmed at one time.
The keyless entry remote transmitters :

• Are programmable.
• Must be set at the same time.
• House four buttons.
• House three buttons (Mexico Anti-Theft System only).

Programming
Refer to Section 501-14B.
Inputs and Outputs
The remote anti-theft personality (RAP) module receives input from the following components for anti-theft operation:

• Hood switch.
• Deck lid ajar switch.
• Keyless entry remote transmitter.
• Power door lock switches (LH and RH).
• Door courtesy input.

The RAP module distributes output to the following for the anti-theft system:

• Power door unlock relay.
• Power door lock relay.
• Liftgate unlock relay (Wagon)
• Park lamps relay.
• HORN relay.
• Dome lamp.
• THEFT indicator.
• Deck lid release.

Arming
The anti-theft system can be armed if:

• The ignition switch is in the OFF position.
• The panic alarm is off.
• All doors are closed.

NOTE: If a door is open, the anti-theft system is prearmed and waiting for all the doors to be closed. The THEFT indicator will remain illuminated for up to 30 minutes waiting for all the doors to be closed. If a door remains open after 30 minutes, the THEFT indicator will turn off and the system will return to a disarmed state. After all doors are closed and the 30 second prearm (continuous THEFT indicator illumination) is complete, the system is armed.
NOTE: If the theft LED does not flash after 30 seconds, check the LED FLASH PID to see if the feature is enabled.
The anti-theft system will be armed when the lock button on the keyless entry remote transmitter is pressed, all doors are closed and 30 seconds have elapsed.
When the system is armed, the THEFT indicator will flash quickly until the system is triggered or disarmed.
Disarming
NOTE: Using a key in a door lock cylinder to unlock is not a valid method of disarming the anti-theft system.
Untriggered System
NOTE: If the driver arms the system and remains in the vehicle, an untriggered system can be disarmed by turning the ignition switch to the ON position.
An untriggered alarm system can be disarmed by pressing the unlock button on the keyless entry remote transmitter.
Triggered System
NOTE: If the hood or trunk are open when the system is armed, it must be closed and opened again before it can trigger an alarm.
An armed anti-theft system can be triggered by the following conditions:
The deck lid door, liftgate, hood or any door is opened using a key, inside door handle, hood release, etc.

• The keyless entry remote transmitter can activate a panic alarm which is similar to the anti-theft alarm, but does not cause the THEFT indicator to flash.

A triggered alarm system can be disarmed by:

• Pressing the unlock or panic button on the keyless entry remote transmitter.
• Turning the ignition switch to the ON position.

Alarm State When Battery Power Is Cycled
When the RAP module is supplied power the first time at the vehicle assembly plant, the system will be in the disarmed state. The RAP module will remember whether it is armed, disarmed or triggered in its non-volatile memory. When the battery positive cable is removed and then reconnected, the system will return to the state it was in just before the battery was disconnected. If the system is in any prearm state, then the system will return to a disarmed state when the battery is disconnected and then reconnected.

The SECURITY light is located on the instrument panel cluster.

If the ignition is off and any door is open, the SECURITY light will flash, reminding you to arm the system. To arm the system, do the following:
1. Open the door.
2. Lock the door using the power door lock switch with the door open or the remote keyless entry transmitter. The SECURITY light should come on and stay on.
3. Close all the doors. The SECURITY light should go off within approximately 30 seconds. If a door or a trunk is opened without a key or a remote keyless entry transmitter, the horn will sound and the lamps will flash for about 30 seconds.

Also can check this and other details in the 2002 Cadillac Owners Manual (page 85 and next).

Hope helps (remember rated and comment this).

Sounds like a bad ignition switch have ur body control module checked for codes if u have a B2960 and or B3033 then replace the ignition switch.

SECURITY
If your vehicle has the remote keyless entry system, this feature allows you to select the method used to arm the vehicle's security system. When SECURITY appears on the display, press the reset button to scroll through the available settings:
* RKE (Remote Keyless Entry) (default): The content theft-deterrent system will arm when the lock button on the remote keyless entry transmitter is pressed or when the power door lock switch is pressed.

* PASSIVE: The content theft-deterrent system will arm itself 60 seconds after the ignition has been turned off and all of the doors have been closed.


Hopd this help (remember comment and rated this).

sometimes turning the ignition on 3 times quickly without starting will reset the computer. If the van has power locks and keyless entry then try using only the keyless entry. Sometimes your car wont have a alarm but an anti theft device which will not allow it to start if it goes off or something triggers it.

you should be able to have them tested at parts department at chevy dealership and I dont think they will charge ya. I may be wrong but they can test them.otherwise it could be a unit called a liftgate module is what recieves signal

a factory keyless entry will not have an override but it does not disable starter.if you are have security issues it is problem with passlock system. if it is aftermarket alarm system then there is a button somewhere but varies where installer put it