Theft / Security Light

The security system on todays cars and trucks prevents the vehicle from being stolen. There are
many variations of the system going back to the early 1990's.

This warning could be on when the engine is running, indicating a fault has been detected in the
system. If left un repaired, there is a good possibility that the car will eventually not start.

There are several different possibilities for the cause of the warning, depending on the make / model /
year of the vehicle. Anything from a bad ignition cylinder wire, to a bad cylinder to a dad Body Control
Module (BCM).

After market (non-factory) alarm and remote start systems can cause havoc with the factory theft
system, causing this warning light, or a no start.
Some recent repair questions and answers
2003 chevy impala need theft learn procedure after ignition switch replaced.
Oldsmobile Alero year 2002 security theft light is on and wont start.
1997 pont/sunfire anti-theft relearn procedure,installed new lock cylinder w/keys @ new ignition
switch.
Comments
Use the search box above. I know i have seen that theft relearn procedure in here before.
1997 Olds regency security light blinks and car wont start.
i have a 1999 Olds Alero and it runs fine i can park it and walk in to the store and come back out
to start it and it wont start the security light is on we can some times let it sit for a little while and it
might start.
Possibly the common problem of the wires are
broke on the back side of the
Passkey ignition key
cylinder, so the theft system cannot read the key.
Many articles on this website for this problem. Just
do a search.
My 97 pontiac Bonneville security light is on and the car wont crank how can i get my car to crank
Possibly the common problem of the wires are
broke on the back side of the
Passkey ignition key
cylinder, so the theft system cannot read the key.
i have a 2001 Alero, starts up perfectly. Anybody. I drove the car up drove a few miles, parked.
Started the car back up and then light was off. What may happen in the future ?? Anybody
oops i wrote the message above i meant i started up my car and the security light was on, drove
a few miles then parked and turned car off. Started it back up and the light was off. I do have an
issue with one of my car locks, its stuck and wont lock. What may the Security light mean ??
The theft system saw a problem, and you are
lucky the car started that next time. Usually they
don't. Sounds like a problem with a bad Passlock
Sensor Cylinder. A scan of the codes would be
needed to confirm this.
No what relating to 9-5, i had a buddy take the car door piece off, actually the
metal rods that are connected to power lock were so rusted., he sprayed em down
and moved them back and forth. Now the car lock works and all 4 doors lock. LOL
9-5 I was talking about the lock, now with this car the car wouldn't start. It would
turn but not start but thanks to google i read up on it. I had to keep the key in the
on position for ten mins, turn key back. Then started on up am afraid this will
happen again. Wat the heck Aleros are bad luck . Am unsatisfied what should my
next move be ???
I HAVE A 2000 CHEVY MALIBU AND EVERY SINCE I HAD THIS RAGGEDY PIECE
OF SH*T I HAVE HAD THIS PROBLEM...UNTIL RECENTLY WHEN THE THEFT
LIGHT GOES OFF I HAVE BEEN ABLE TO CRANK RIGHT UP AND GO BUT ON
MONDAY AFTERNOON I HAVE NOT BEEN ABLE TO CRANK MY CAR DUE TO
THE LIGHT NOT GOING OFF AT ALL.. I GOOGLE THE ISSUE TO TRY OUT
DIFFERENT METHODS OF GETTING THIS RESOLVED..I HAVE BOUGHT
GRAPHITE TO SPRAY IN THE IGNITION SWITCH.. I HAVE TRIED TO RESET THE
THEFT SYSTEM...ETC,,,NOTHING IS WORKING....ITS A SHAME THAT GM
KNOWS THAT THIS IS AN ISSUE BUT IS STILL MAKING CARS WITH THIS
PROBLEM...I WILL NEVER EVER EVER PURCHASE A GM VEHICLE AGAIN.
I have an 2002 Olds Aurora 3.5 V6 and have been having trouble with the security system. It
seems to happen after a heavy rain or running it through the car wash. The dashboard lights
flash, the DIC screen flashes service stability system, security system fault, air bag problem. The
traction control goes to the off position and won't go back on, the engine temp gauge and the
gas tank gauge indicator goes to zero, etc.
All kinds of crazy stuff.  Yesterday, the security light came on.  I parked the car and shut the
engine off.  When I came back out from a store I visited the car would not start. I called Triple A
and they came out quickly but at the time of their arrival, the car started.  They ran a diagnostic
on it and everything else was fine, battery etc. However, when I drove it the security system went
crazy again but the car still ran.  Any comments or suggestions about what is going on with this
situation?
You have many more problems with your car than just the
security system. This is just one of the problems. You have an
electrical issue that is effecting many different systems. With
what you describe, i would suspect a loose connection or bad
ground getting wet, or a bad ignition switch.
I have 2003 Pontiac Grand Prix with the same problem. It is the BCM. You can bypass it by not
using the remote or the electric lock button inside the car to unlock and lock the doors. Only use
the key to unlock the door from the outside and lock each door manually. Been driving mine 6
months now. BCM is $450.00 and is VIN specific. They also have to calibrated to the car once
put own. Hope to get mine done next month. My girlfriend drives the car everyday. She is the
one who figured out not to use the electronic devices and everything is working fine. This gave
use some time to get the money together to replace the BCM.
I hate cars!
i have a 2000 chevy malibu alarm started going off lights flashing horn honking car still starts
theft system light does not say on but the little red light above radio flashes and head lights
flash and horn honks can not figure out how to make the stupid peice of crap stop doing that i
do not have remote or stock radio help me PLEASE
Possible bad body control module. This control
the alarm and lights, among other things.
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Vehicle Theft System Explained