Will the vehicle start and run? Have you tried a different key? Check for applicable trouble codes. To check codes yourself, at the least, you need an obd2 code reader that will read both generic and manufacturer specific codes.
You can try the 30 minute relean procedure. Turn on the ignition with key off. Attempt to start the engine, then release the key to on ( vehicle will not start). Observe the security lite, after about 10 minutes the security should turn off. Turn off the ignition and wait 5 seconds. Repeat the above procedures two more times for a xtotal of three cycles/30 minutes ( the vehicle is now ready to relearn the password on the next ignition switch cycle from off to crank.)