Hi donarba,
Although my keyless fob works (most of the time), I too have the same problem as you do. I took my '95 RRC County LWB to a "Classic LR" mechanic to diagnose it and he was able to find that the problem was two-fold: 1) the lock mechanism had failed on the "lock" side and 2) the electronic lock sensor was not working due to a mechanical failure in the attachment arm. The total for fixing the issues was over US$1000 and I chose not to have it performed. The cost of labor is steep due to the fact that the entire window frame assembly needs to be completely taken out of the door to access the door lock mechanism; the parts are over US$500 as well.
So, when my keyless system is on the fritz, I do the following: make sure all the passenger doors/lift gate are locked, then manually lock the driver's door, insert my key in the lock and turn it anti-clockwise, then shut the door. It locks OK and unlocks very well (that was never a problem).
Anyway, I hope you can get it fixed - perhaps you can find good, used parts. I found a used electronic locking mechanism for under US$200, but I was too uncertain that it would last.
Bob
Grin and bear it!
Bob
1995 Range Rover Classic, LWB - 70,000 miles and going strong!
1998 Land Rover Discombobulator, OMG - 100,000 miles and died of multiple self-inflicted injuries.
2005 Range Rover HSE - 177,000 miles and had the good sense to die before I paid for it.