Power lock door not working

Yes, have power at both switches. Like I said earlier I guess my next step will be to remove inside door panel to get access to check power at the actuator. But I get lazy! Will let you know once done.

I have tried the rear door. Checking for power to the actuator. Well there is power to the actuator! For some minutes, unlock and lock were working everywhere (as it should be) and no more light roof lighting up when pressing lockunlock button. But God knows why, when I picked up my tools and shut the side door, then nothing worked anymore and light roof light up again when pressing lock or unlock button. Good news is, the door lock is not the problem!

Made another attempt tonight. Since it stopped working while opening the passenger door, I checked in that area. Especially where the wire harness from the door enter in the passenger's feet area. Lot's of wires are there. I found a corroded connector pin. In fact there was some corrosion between two connectors and my explanation is this:
When I pressed on lock/unlock button, the corrosion on those two holes (female type connectors) shifted the current normally sent to the lock door actuator, to the dome light. I cannot tell for sure if the other hole connector was indeed for dome light but I am assuming that was the case. Does that make sense to you?

I tried several times, opened and closed doors and worked every time!
Before saying for sure my issue is solved, I will see down the road if problem resume again while traveling.

Well, I already checked that bunch of wires in the driver door, since it is the door that open the most, but I have not found anything suspicious. Like I said, I will drive it for a while and see if problem occurs again.

Here is the a final update on my door lock issue. The real issue (and fixed) was a faulty relay (the one behind the wall behind driver seat)I had to sent the van to a mechanic to have it fixed. He bypassed that relay, so now it locks and unlocks every time!