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, 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/
Do It Yourself GM Security bypass
I have it 2. fix it today :) was vry easy fix
THANKS,
ding
SOURCE: 1993 cadillac deville security light fashing will not start tryed new key no luck
try disconnecting the negative battery cable for 15 min hook back up and see if it will start.it worked for me the first time but i am having the same problem with it right now and its not working and i cannot figure out what it is that i need to do.
SOURCE: car want start factor security light flashing and
The factory security light will remain on - this is a standard feature indicating the car is dead.
First, unplug the hazard fuze in the engine bay (this will reset the ecu and remove the flashing)
Next, replace the battery with a new one (or one with proper charge) - keep in mind a small battery will not do anything for these cars, the engines require a lot to push them over (it isnt a honda)
*Make sure to clean the positive and negative battery cables from acid
Then just start it up :)
SOURCE: Security light flashing and car won't start now
does it start at all, or does it run for about 1 second and shut off? if the latter, then it's the passlock system, and he could have a defective key or security module. the keys have a predetermined resistance value which activates the passlock system to prevent hotwiring. If it is the passlock system, then sometimes you have to wait 15-20 mins for it to reset before starting the engine.
SOURCE: 1993 buick lesabre won't start. security light is
The coded key probably needs to relearn. Turn ignition to crank and release. Let sit in on position (engine off of coarse) for a full 10 min. turn off for 30 sec. and repeat 3 times engine should start. This procedure should take 30 min. so a booster is needed to maintain a full 12 volts. Do not attempt w/out a charger connected;
SOURCE: 1997 olds cutlass supreme The security light is
Open ,and shut the doors,and the hood,and the trunk,then set the anti-theft,leave it set for 5 minutes,then disarm the anti-theft,and then try and start the vehicle.
114 views
Usually answered in minutes!
×