Just as I was about to order a replacement passenger front power door lock that hasn't worked for months, it began working perfectly, most of the time, which coincided with the drivers door lock ceasing to operate. I doubt that it is a coincidence. My guess is that whatever controls the locks is faulty and the lock actuators are fine.

What controls the locks and how would I troubleshoot?

Thanks,

 

Sounds like actuator problem, the lock switch opens all doors simultaneously as does the fob. You will need to pull the panels off the affected doors, check electrical connection and lubricate all moving parts with a good lithium grease spray, work the mechanisms until operating smoothly. Test several times before reassembly.

 

Unfortunately, the only fix for the failing door locks is to replace them.

 

Are there any weak spots in the wiring that are commonly known? My rear ones work, but not with power, both front ones are fine. Would this be an actuator on each one or would it be something killing the whole back end?

 

It doesn't make sense that it is an actuator problem only, the passenger front door lock didn't work at all for months, in one day it started to work while the drivers door simultaneously stopped working. It seems like there is more to it but I'm not sure how to diagnose what is the problem.

 

Sounds like a short or a bad switch.