Question about 1999 GMC Jimmy

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My 1999 jimmy is in theft mode. how do I bypass that?

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Read thru this link, you should find everything you need.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on Feb 18, 2012

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Posted on Jan 02, 2017

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2 Answers

Truck will not start anti theft will not shut off


The security light illuminates when that signal gets broken, or not seen at all. When the communication breaks, the car misinterprets this as an attempt at theft and goes into antitheft mode. (like it thinks it's being hot wired) The car shuts down because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle. It will either turn off the starter, or the fuel injectors. The vehicle may run for 2-3 seconds before shutting down. This link explains it pretty well.
http://www.diy-gm-security.com/

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Do It Yourself GM Security bypass

Aug 07, 2016 | 1999 GMC Jimmy

1 Answer

How do I hot wire a 1999 GMC jimmy


1999 jimmys have a passlock system that is a theft deterrent and cant be "hot-wired" in the normal way. If the cylinder isn't rotated while beinging started correctly - the ecm will disable fuel to the injectors and it will not run

Oct 25, 2015 | GMC Cars & Trucks

1 Answer

The ignition and key are good but the car is in theft mode


your anti theft device is activated,you need to lock and unlock your doors a couple times with the key fob,not the key,and then you need to put the key in the ignition and start it,if you dont have your key fob,call your car dealer to get a new one,they are programmed for each car only,you cannot bypass it.

Jun 09, 2015 | 1999 Cadillac DeVille

1 Answer

How to disingage anti theft system


There are ways to fool it but it is virtually impossible to deactivate or bypass.

Feb 18, 2015 | 1999 GMC Jimmy

1 Answer

1999 Jimmy security light on wont allow to start


you have tripped the anti theft use rest steps then it should start

Apr 12, 2013 | 1999 GMC Jimmy

1 Answer

How to bypass anti-theft system in 1999 chevy silverado


i worked for G.M. 24 years and i dont know of any way to bypass a theft lock sym. sorry

Mar 23, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Security light wont turn off ...is there a sensor in door


The security, antitheft, or passlock light is a visual indication that something in the car's antitheft system is failing. In most GM cars and trucks there is a hidden system that most people are unaware even exists. From the moment you put your key in the ignition, there begins a constant line of communication between your key's security chip or transponder, to the ignition's lock cylinder, and then to the car's TDM (Theft Deterrent Module). These 3 parts are in CONSTANT communication. If the key is in the ignition, then these parts are sending signals to each other. The security light illuminates when that signal gets broken, even just for a second. When the signal breaks, the car misinterperates this as an attempt at theft and goes into antitheft mode. The car thinks its being stolen or hotwired because it is not getting that signal from YOUR specific key. This is why the security light turns on and shuts down your vehicle.
This link may help you find ways to bypass this or fix it yourself.
http://vatspasslockpasskeysecurityhelp.yolasite.com/

Oct 15, 2012 | 1999 GMC Jimmy

1 Answer

Where is shift actuator located on 1999 Jimmy 1999


I had the same problem with my 1999 Silverado which would blink several times on the mode I selected then go back to the 2 wheel High. I found the switch module to be defective, after replacing it I have never had the problem again.

Nov 22, 2010 | 1999 GMC Jimmy

2 Answers

I took the cat off on my 1999 Jimmy. Now a code


thats easy,,,put the cat back on,,,the car wont run right with out the cat fitted,, your lucky the car.s computer never put you in "get you home mode!" in that it would have ran like a dog and if you were lucky you may have got as much as 15 mpg @35 mph tops!!!!

Mar 08, 2010 | 1999 GMC Jimmy

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