Volvo: 89 240 power locks, vent area, main switch

Question
The auto lock system on this 89 240 has ceased to work.  It doesn;t seem to be a fuse as other systems on the same fuse are working.  Is there a switch in the door panel that goes out?  Any suggestions on repair?

Answer
Rick,
The main control for the locks is inside the left front door. It is the switch that is attached to the lock button. If the fuses are good next thing to test is to see if the wires to the main switch are good and the power is getting to the switch. The relays are behind the center dash vent area there are two of them. Small square one usually silver.