Passkey security ignition cylinder removed showing where common broken wires are.
1- Wires for security sensor break here
2- Connector under dr. side lower dash panel to test resistance of
sensor with key in ignition. Open circuit means wires are probably
broken, and replacement of ignition cylinder is needed.

View question and answer from another visitor.
GM passkey security system.
Common cause for car to not start.
Theft / security light on dash.
11-5-10
ignition wont turn to off position and wont release key.
Comments
This could be a badly worn or bent key, a binding
cylinder, or a shifter problem, depending on what type of
vehicle this is.
3-1-11
2001 s-10 key is out of ignition truck is still running cant turn truck off
If the key is ion the OFF position, then it sounds like the
ignition switch is bad. If it wont go all the way to the OFF
position and the key comes out, the cylinder is bad.
7-4-11
just had my ignition replace because the car was stolen but don't know if they replace the
cylinder try doing the 10-12 minute step n it still wont start but theft light is still on
7-17-11
I got home killed the engine and 3hours later tried to start the engine and the starter didnt
engage
7-17-11
I got home killed the engine and 3hours later tried to start the engine and the starter didn't
engage
7-20-11
OK. Going o need more information than that. What kind of car or truck? Is the battery tested as
good? Any warning lights on the dash?
i tried to change the stereo in my 2003 malibu and now the car wont start how do i bypass the
passkey security lock?
Replacing the radio would have nothing to do with the
car not starting, unless you damaged some wiring to the
ignition switch or Passlock sensor.
The older theft system on many Oldsmobile, Chevy and Buick model cars is known as the
Chip-In-Key. This was used in the early to late 1990's. The correct name for this system is
Passkey, or Passkey II.
A very common problem that happens on this system is broken wires. This will cause your car to either
not crank, crank ans stall out right away, or not crank at all. It depends on when the failure occurs.
Sometimes you may notice that the light comes on now and again while driving with no other problems.
Then one day it won't start. Then after a few minutes it will start fine. This is usually because the steering
wheel was turned or tilted and the wires touched again enough to let the car start.
There may be codes stored int he computer, but not always. The repair for this is to replace the ignition
cylinder. The wires cannot be repaired since they break right where they come out of the cylinder. There
be also be a new key with the cylinder. The key will have to be the same chip number as the original.
The parts department will have to look up the number by using the VIN number of the car.
Thank you this was a great help, my security light is on and car wouldnt start thank you.

Common GM PassKey Theft System Problems On GM Vehcles


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