S62/1 has no input to the central locking system. The function of this switch is only to arm/disarm the alarm and to activate the window convenience feature.

The reason I ask about the aftermarket keyless entry is because they are frequently spliced into the wire that runs from the contacts in the in the drivers door lock mechanism and the vac pump. I've seen some real hack jobs here--wouldn't surprise me if a connection came loose.

If it were my car, I would remove the rear seat to gain access to the vac pump. Then I would check to see that I get either ground or +12 on the wire coming from the the LF door. (don't have the schematic in front of me, but I think its the blue wire that comes from the LF door) With the key in the lock position, you should get a ground, with the key in the unlock position, you should get +12. This will at least verify the continuity of the wiring, and the function of the switch.

I'm out of time right now--I'll provide some more info later.....

J. M. van Swaay