Hi, I have a 96 Honda Accord EX car. Every time when I lock the power doors by remove control or key, the front door locker and rear door locker of driver side make loud noise, the doors still are able to be locked. But no noise at all when unlock the power doors. Also no any noise heard if lock doors by key without battery connected. Which component was broken to cause this problem? Thank you very much!

 

Probably the door lock actuator, do a search as there's a quick fix for them