Antitheft system will not disarm with key and car will not start

DANNY LEYBA

MEMBER
2006 CHRYSLER 300
3.5L
6 CYL
AUTOMATIC
114,000 MILES

My car was turning on and then turned off. So, I noticed the red flashing light on my dashboard, and it happened to be my anti-theft system light that it was activated. So, I hit the panic button and tried to deactivate it like that, but that did not work, and nothing would work with my panic button to turn it off. Putting the key in the ignition wouldn't turn it off. So, then I remove the fuse and I put the fuse back in and my car would not turn over and start at all after that but it was making them it was starting and then turning off on me, but I cannot get the anti-theft system to stop flashing so I'm guessing that that's what has my car on lock and preventing it from starting.

4 Replies

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Hi,

I'm not sure which fuse was removed, but I need you to check three of them. All are located in the fuse box in the right rear of the trunk.

When you check these fuses, make sure they are good, and more importantly, make sure they have power to and from them. Here is a link that you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Next, you indicated when you put in the key, it stops flashing. Is that correct? When you try to start it, does it come back on?

Let me know what you find. Also, we may need to have the can-bus scanned. However, I would rather start with a simple electrical test.

Take care,

Joe

See pics below. The last pic identifies which fuses to check.

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Thursday, December 16th, 2021 AT 7:28 PM

DANNY LEYBA

MEMBER
3 POSTS

I removed 5 and 29. When I first got in my car, I was able to turn it on but it only lasted like 3 seconds and then shut off so I kept doing that like three times four times. Well, I noticed that the red light was flashing on the dash and that indicates the anti-theft system, so I figured that that hadn't been or however you would say it it hadn't read that I was not stealing the car and it didn't turn off. So, then I hit the panic button on my key to find like to make it go off so that way it would stay off and after I did that my car would not do anything no cranking no nothing. So, then I had to disconnect the battery, well not disconnect the battery I had to pull the anti-theft out and so that way it would go off because my key would not turn it off after that my key would not unlock the doors after that.

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Saturday, December 18th, 2021 AT 4:36 AM

DANNY LEYBA

MEMBER
3 POSTS

When I connect my battery everything like lights and all that turn on, but nothing happens when you crank it over, like nothing, no noise and barely a slight noise maybe from where you that like little cranking sound like when you first do it, but nothing to do with the engine turning on or nothing. My key is broken, and I am pretty sure that I might have a cheaper battery than what I usually have in there.

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Saturday, December 18th, 2021 AT 4:37 AM

JACOBANDNICKOLAS

MECHANIC
108,269 POSTS

Are the fuses I mentioned good and have power? It does sound like anti-theft is the issue. When you say your key is broken, please explain exactly what is wrong with it. The anti-theft has to recognize the key, so if it is bad, that is likely the cause.

Also, disconnect the negative battery cable and allow it to sit for about 20 minutes. Then, reconnect it to see if anything changes.

The idea that you removed fuse 29 shouldn't have caused an issue. However, that is what supplies power to the SKREEM module. I have seen situations where the WCM (wireless control module) locks up and needs to be replaced. That can be caused by a power surge or even static when the key is placed in the ignition. However, the only way to test it is using a scanner that can read CAN codes. CAN stands for controller area network. Basically, the modules are all tied together via a few wires. This will retrieve codes regardless of the module storing them.

If the WCM is locked up, the vehicle will do exactly what you are experiencing. However, the only way to know is via a scanner. If the WCM is locked up, the scan tool will identify the module as, Off-Bus."

There is one other test that may identify if the WCM is locked. As a test, I need you to pull a fuse. Remove the IOD fuse (with the key out of the ignition switch), wait for 10 seconds, and then reinstall the IOD fuse. If the vehicle then starts, the WCM needs to be replaced.

The IOD fuse is in the rear power distribution center. By removing it, you are resetting the system. I attached a pic below of the fuse location in the box. It will be a 60-amp fuse.

Let me know what you find.

Take care,

Joe

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