[SVXdc]

The OEM security module only recognizes a single button on the remote. The OEM remote only has one button. Push to change from unlocked/unarmed to locked/armed, and vice-versa.

The problem is not with your security module or remote.

When you lock via the key or the slider lever inside the door, you're locking that door mechanically. Inside the driver's door, a switch causes the passenger door actuator to lock the other door.

Sounds like the door lock actuator in your driver's door (or the wiring or a connector) is bad. Search for older posts — I think some people have fixed the problem by removing the interior door panel and cleaning the contacts. However, in some cases the actuator was fried and had to be replaced.