Defective CCM can be any number of symptoms, too many too list, however, if it's only one door that seems affected (does not lock or unlock) but everything else works as it should, I can tell you it's NOT the CCM.
Before ripping anything appart, try removing your battery cables, touching the positive and negative cables together for a few seconds (this should discharge any remaining current in the system) and reconnecting the battery, this sometimes clears "hickups" encountered in the CCM.
A couple of tests you can perform beyond that are - try the lock/unlock button on the driver's door and passenger door as well as the remote control, if the door is not responding, yet the other door(s) are working fine, it is one of 2 possibilities, a dead door lock mechanism or a disconnected wiring harness at the door lock mech., either way, you will have to remove the door panel (see FAQ's for instructions) to get to the mechanism for trouble shooting.
Once you have the door panel off, you can run some tests on the harness using a voltmeter to verify that hte problem is with the locking mechanism.
1999 to 2001 model years have issues with the 6 solder points where the harness connector mounts to the circuit board at the mechanism, sometimes, all you have to do is re-solder those joints - also see faq's for the proceedure on repairing the mechanism.
Scarpyards and ebay will have modules at relatively good prices.