I would carefully remove the door panel and have a look. You might need one of those dental type automotive mirrors and a flashlight. Have someone operate the locks, it might be a loose clip and check the wires and electrical connections leading to the lock actuator.
Good luck.
OK, I figuered it out while checking out the Toyota parts site. The OEM part I need is called "Fender Flares, Mudguard". This is required when Fender Flares are installed w/o Running Boards. The parts guy must have went right to "Mudguards".
Toyota-4Runner.org is a great site. Oh and I must...
I just bought an 02 Sport Edition with no running boards for the wife. I like the look without the runners but want front tire protection from salt and slush this winter. I went to my local Toyota dealer and ordered OEM front mud guards.($43 each side)
When I picked them up and tried them on...