it's a security feature to prevent you from getting locked out with your keys still in your car while it is still running
Try this: Turn the ignition to RUN (do not start), press the unlock button on the keyless remote, ignition OFF. Repeat 2x. Turn the ignition to RUN, press the unlock button on the keyless remote twice, the power locks should cycle to indicate successful programming. Turn the ignition OFF and test remote.
On the inside of the keyless entry remote or sometimes on the back it explains how to do this. I believe you hold the unlock button along with the lock button for 7 seconds near the car. It will explain it on the inside of the keyless entry remote.
Put the appropriate key in the door, and turn. Or use the remote if you have keyless entry.
Unlock the doors or trunk with the key.
You can program the keyless entry remote, for your 2001 Saturn L200, by holding the unlock and lock weapons at the same time. The red light will flash on and off. The remote will be programmed when the red light stays illuminated.
First unlock and open the hatch, the horn alarm is now disarmed and you can unlock the driver side door.
To program a remote keyless entry on 1996 Chevrolet pickup, first hold down the power unlock button of the door panel. Second, turn ignition key ON, OFF, ON, OFF. Then release power unlock button on the door panel.
Change batteries and press lock and unlock remote at the same time for (8) second.
To program the keyless entry remote on a Chevy Malibu, close all doors and put the key in the ignition. Hold down the power unlock button on the door while turning your key to on and off twice. Then release the power unlock button on the door.
Try turning the ignition on and off about 10 times until the door locks, lock and unlock, then lock with the remote done.
You might need to programming the remote. Their should be instructions in the users manual. You're remote could also be need new batteries.
Factry installed remote keyless entry system is only thing to unlock.