Hi Chris,
Autolock feature will work if the following conditions are met:
1) autolock feature is activated.
2)driver's seat is occupied.
3)all doors are closed.
4)ignition switch is in run position.
5)the shift lever passes thru reverse position.
To activate autolock feature:
1)enter the five digit permanent entry code into the keypad.
2)within 5 seconds of entering the code, press and holdthe 7/8 button on the keypad.
3)within 5 secondsof pressing and holding the 7/8 button, press and then release the 3/4 button.
4)within 5 secondsof releasing the 3/4 button, release the 7/8 button on keypad.
To deactivate the autolock, repeat the above sequence.
If this doesn't work, buy a factory service manual off of ebay and follow the diagnosis procedure for testing the system.