Starting problem with my 2004 Chevy Monte Caro
SECURITY LIGHT ON DISPLAY IN DASH
NEW IGNITION SWITCH WAS DEALER INSTALLED
tip/donation yes
tech = JK
question = HOW DO YOU RELEARN THE SYSTEM TO START THE CAR.
The key turns but the car will not start.
JK:
Theft / Security Light
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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.
Chevy Monte Carlo Theft Relearn Procedure
Here is procedure to relearn the theft password. But if this part was replaced at
the dealer, that would have been done and the car should always start now,
unless there is another problem in the system.
1.Turn ON the ignition, with the engine OFF.
2.Attempt to start the engine, then release the key to ON (vehicle will not start).
3.Observe the SECURITY telltale, after approximately 10 minutes the telltale will
turn OFF.
4.Turn OFF the ignition, and wait 5 seconds.
Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the
vehicle is now ready to relearn the Passlock Sensor Data Code and/or
passwords on the next ignition switch transition from OFF to CRANK).
Important: The vehicle learns the password on the next ignition switch transition
from OFF to CRANK. You must turn the ignition OFF before attempting to start
the vehicle.
Start the engine (the vehicle has now learned the Passlock Sensor Data Code
and/or password).
Best to have a battery charger on the car so the battery does not go dead
during this 30 minute procedure.

