Need to reset security system on 2003 alera light not blinking on radio when car is off

SOURCE: 1994 cutlass supreme--security light on--car won't start

take to dealer and have them reprogram the computer

SOURCE: 1999 Oldsmobile Intrigue security light on/power only sometimes

I don't know about GM, but some Ford have a interlock type system that will not let the car start untill the security system is deactivated by the remote. If you have the remote then try hitting the unlock button a couple times with the doors shut and then try starting it.

SOURCE: We need to reset the computer on a 2003 Oldsmobile Alero

HI there if the scan tool you are using will not reprogram the theft module the try the 10 min relearn

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.
5. 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 Passlock™ Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
   
6. Start the engine. The vehicle has now learned the Passlock™ Sensor Data Code and/or password.
7. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles

SOURCE: car wont start has power has fuel and starter

The security system is activated. It kills the injector pulse ( signal) and on some modles the starter. You will need to try to relearn the system. First try to start the car, leave the key in the run position for 10 minutes. Cycle the key off, then cycle it to the run position again for 10 more minutes. Cycle it off again, then back to run for another 10 min. after the last cycle turn it off then try to start the car. It is a 30 minute relearn. If this does not work you will need a repair shop to replace the passlock sensor. Good Luck

Testimonial: "it was in the ignition and the security activated i had to replace the whole igintion key and all "