Blinking Anti-theft light?

Welcome to 2CarPros!

Does the vehicle display any messages in the center of the dash when you insert and turn the key? Typical message are normally "Damaged Key" or "Wrong Key". If you don't have any messages displayed or response from the vehicle otherwise when the key is turned, it's very possible there is an issue with the ignition switch(Wireless Ignition Node). Regardless, I would see if there are any Diagnostic Trouble Codes set as this will aid in narrowing down the issue. Take a look at the article below for more information.

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/how-to-reset-a-security-system

This is an 03, uses a SKIM, not a WIN module. WIN have had recalls, and are notorious.

Hello,

Yep these cars have a problem with the BCM module. You cant disarm it becasue it runs throughout the computer system.

Here is the wiring diagrams so you can see how the system is tied in.

Also is the alarm factory or aftermarket?

If the battery is weak it can make the alarms go off.

https://www.2carpros.com/articles/car-battery-load-test

Please let us know what happens.

Cheers, Ken

The BCM needs to receive the disarm signal in order to keep the alarm from going off. See the attached under the disarming. If you are not starting the vehicle with a valid ignition key then the alarm will not shut off. Unfortunately there is no work around that would be cheaper then getting a key that is programmed to the ignition. You can find lock smiths or other shops that have the ability to program these keys for cheaper then the dealer. Plus keys that will work can be found for less the $50.00.

I attached the information and the programming instructions that require a scan tool capable of doing it.

Here is how to reset the security system. Remove the battery cable, then turn the key on and reconnect the battery. That should do it.

Here is how the factory says to do it, but it doesn't always work.

Unlock the car and disconnect the battery and let it sit for 30 minutes. Then reconnect the battery and lock and unlock the drivers door using the key.

The system should be reset.

https://www.2carpros.com/articles/how-to-reset-a-security-system

If the key needs to be programmed the instructions are below.

The steps required to reprogram Sentry Keys with two valid Sentry Keys follows:

1.Obtain the blank Sentry Key(s) that need to be programmed. Cut the keys to match the ignition lock cylinder mechanical key codes.

2.Insert one of the two valid Sentry Keys into the ignition switch and turn the ignition switch to the ON position.

3.After the ignition switch has been in the ON position for longer than three seconds, but no more than fifteen seconds, cycle the ignition switch back to the OFF position. Replace the first valid Sentry Key in the ignition lock cylinder with the second valid Sentry Key and turn the ignition switch back to the ON position. The second valid Sentry Key must be inserted within 15 seconds of removing the first valid Sentry key.

4.About ten seconds after the completion of step 3, the indicator light will start to flash and a single audible chime tone will sound to indicate that the system has entered the "Customer Learn" programming mode.

5.Within sixty seconds of entering the "Customer Learn" programming mode, turn the ignition switch to the OFF position, replace the valid Sentry Key with a blank Sentry Key transponder, and turn the ignition switch back to the ON position.

6.About ten seconds after the completion of step 5, a single audible chime tone will sound and the indicator light will stop flashing and stay on solid for three seconds and then turn off to indicate that the blank Sentry Key has been successfully programmed. The SKREES will immediately exit the "Customer Learn" programming mode and the vehicle may be started using the newly programmed Sentry Key.

Please let us know what you find.

Hello,

These vans had a problem with the BCM which ties in the alarm and windshield wipers which explains the problem. You might be able to have the dealer update it but if not you will need a new one.

Please let us know what you find so it will help others.

Best, Ken

If the security light is ON when you try to start the engine you have one of a few issues. The key is not programmed into the system or the system itself is defective. With the light ON during the attempted stat the security system is actively disabling the starter and the fuel system.

There is no bypass, you need a factory level scan tool to talk to the anti-theft system and determine if it's the key, or the receiver that isn't operating or if it's in the BCM.

Ok I will send a pic of the body control module that controls all the lighting and windows and alarm system. So no you can not disconnect it. Here is the test procedure to see if it is activating. See the alarm stops the injector pulse so if you can't do this then have a shop check to see if the injector is getting the pulse it should get with a noid light. If it is not then you should test the body control module and if it is bad then replace it.

Hope this helps if I do any more just ask ok.

Follow this guide

https://www.2carpros.com/articles/how-to-reset-a-security-system

Please run down this guide and report back.