My door ajar light stays on all the time. I’ve tested the door ajar switches from the plug at the VSM.
If I test using the ground wire on the plug, the passenger front and rear test ok and driver front and rear have no continuity. If I test the driver side using a ground on the truck, the drivers side has continuity.
Does that mean I have a bad ground somewhere? I have checked the wiring that goes through the door hinge and I don’t find any broken wires. Where do I go from here?

 

I thought I had at lease one year's diagram saved. But I didn't. Have you tried unplugging the switch at each of the doors yet?
Then using a jumper to trick the module into thinking that the door is closed.

You might try this video.

 

Şure sounds that way. Not sure how much wire troubleshooting you've done but a wire can look perfectly fine on outside and be pulled apart on inside. I'd check the hinge area real close again and go from there.

 

That would be the first place I would look for any damaged wire.
On the Suberduty trucks, that switch and plug are not that hard to get at.