Security light comes on and car wont start - 2003 GMC Envoy

SOURCE: 99 Bonneville wont start, Security light on

when you locked your car did you use the fob to lock the car? If so close the car door and unlock the car using the fob!! If you use the remote/fob to lock the car you must use it to unlock the car otherwise the car will not start and will stay in Security mode. I have a 99 as well and found that little trick out lol.

SOURCE: 92 buick park ave security light on car wont start

Someone put the wrong key (resistor value) in the ignition lock, you will have to disconect the battery for 3 min. Make sure you have the right key. Very important! Make sure the climate control is off before disconecting/conecting the battery.

SOURCE: Security light blinking

take it to a shop and have them diable the security system

SOURCE: car wont start

YOU SHOULD REPLACE THE IGNITION .

SOURCE: my security light comes on and i can't start my car

your car security system can not be disable but it can be bypass

but firts on these models it is the pass key the problem

on your key to strt the car you have a little round black thing with a little metal contact this is a resistance that is in your key when you put it in the hole to start your car it mesure the ressistance
and the you can start your car

the usual problem with this system is that in the ignition key lock cylinder there are two wire
and usualy one of the two wire just cut so i would remouve the stearing wheel and get that wire fix

hope that will help you !!!

the way to bypass the system is easy but you need to realy know what you will be doing

first you mesure the ressistance in the key in (ohm) and second get a ressistance the same value from any places that sells electronics

after you will find in your car the passkey decoder module (behind right side of i/p)
the two wires that come out of the box (B7 ppl/wht and B8 wht/blk)
cut these two wires and weld the ressistance in bettwen
this way you won t have to take your stearing appart
and your system will be bypass for ever

great day to you


Denis