Toyota Corolla 1998 - Remote locking not working on driver door - BenRM

When I use the remote locking it does not open or lock the driver door. All other doors work fine. To lock the driver door I have to use the key. When using the remote fob the alarm sets as normal. Has anyone got any ideas on how to fix this?

Toyota Corolla 1998 - Remote locking not working on driver door - madf

Broken wiring or failed actuator. Test with multimeter.