How do you troubleshoot power locks on a 1990 Honda Accord if when you press the switch the relay seems to click but the doors are not locked?

Well if you are hearing the clicking on both ends of lock and unlock switching, then that would be a good sign! This means that the relay module is working as far as it trying to move the lock motors located in the doors. Be sure to confirm that the clicking sounds your hear come from somewhere near the dash under part or from one of the doors closest to where the door attaches to the car and not where it opens away from the car. You are trying to locate the relay module by doing this. Next check would be to test the lock motors that would be located inside your doors. Remove your door panels to find the motors located somewhere near the open side or key cylinders. You will find 2 wires leading out of the motors; these wires alternate 12v positive and negative between the two depending on whether you