Help! 2008 Mustang GT Check Security System

Posted Feb 06, 2009 · 02:53 UTC#1

Hey Guys,

I installed the Pioneer AVIC F90BT into my 2008 Mustang GT. Install went really smooth and everything works great. One Problem though. Sometimes when I start my car, the check security system warning comes on. Any thoughts?

Posted Feb 06, 2009 · 03:07 UTC#2

Well, I don't think it's related to the AVIC. The Mustang's don't have any kind of radio theft sensor.

Maybe the computer got confused from having the battery disconnected, or the RFID tag in your key is having issues. Have you tried another key?

Posted Feb 06, 2009 · 03:51 UTC#3

I haven't tried another key but I can. Its kind of weird though, it only does it when I am making quick stops. It does it when I am shutting my car on and off in few minute intervals. Like going to several stores within a few minutes. If the car has been off for a while or go on a long drive, it doesn't do it.

Posted Feb 06, 2009 · 05:48 UTC#4

Hmm, that is weird. Well, that pretty much rules out a wiring problem. Try disconnecting the battery for a little while, it fixes a lot of weird little issues.

Posted Feb 06, 2009 · 14:09 UTC#5

If you have access to an ODB reader, check the vehicle for any codes. If any come up, delete them, soft codes like that can be erased and sometimes fix the problem. Has this ever happened before the installation?

Posted Feb 06, 2009 · 14:33 UTC#6

Most Auto parts stores have OBD II tools and they will scan and reset your codes for free, places like Advance or Discount auto.... Another thing you can try, completely disconnect the battery and physically touch the Pos and Neg cables together. Not sure if it'll help with your issue or not, but it works for clearing hanging codes in some vehicles.

Posted Feb 06, 2009 · 16:04 UTC#7

If you don't already have an SCT XCal, get one and get a tune while your at it. Then you can do all the data logging you want, read codes and adjust you car to match any mods you have done. Worth every penny.

Woke my car up big time.

Posted Feb 06, 2009 · 23:40 UTC#8

Thanks guys. To answer one question, No the car hasn't done this before install. I have tried disconnecting the battery and didn't see any difference. I have a SCT Tuner do not have access to it right now because of a relocation process right now. I will be able to get it back in a few days. I will let you guys no what I find.

Posted Feb 08, 2009 · 23:05 UTC#9

MY SCT X3 didn't find anything but the issue is still there.

Posted Sep 24, 2023 · 02:56 UTC#10

I'm having the same issue and now my 2007 mustang GT want cut off either,unless I disconnect the battery and pull fuel pump relay, looking at replacing ignition switch..