Howdy,
Where should I start? What typically needs replacing?
1997 four door - Power Door Lock, on driver's door, locks all the other three doors except the Driver's door. It always needs to be locked from outside using the key. Figured there is a known issue I could start with.

 

Likely just needs some cleaning and lube. Does it unlock? Check the connector on the actuator.

 

Where is the connector acctuator? My power lock in my 99 XJ on the driver door only works intermittently.