Suburban Power Door locks only one works.

[Suburban2500]

Hopefully someone on here can help me out. I've tried just about everywhere else and nobody else seems to have this problem.

 

My 2000 Suburban is having problems with it's power door locks. Only the driver's side works. I originally thought it was the actuators, but I replaced the passenger side one and the problem hasn't changed at all. Then I replaced the driver's door control switch, but that didn't help either, although it did fix another one of my problems. It seems like the actuators aren't getting enough power and some only seem to be getting power one way (unlock only), while others make noise both ways. Is there a good way to test the other actuators with a multimeter? I'd replace them all but none seem to come with the extra sensor or whatever it is and I also don't think that's the problem.

 

Thanks for any help.

[HagiborChayil]

2000 would be positive switching so yes, toss your meter on the motor and try pressing from the fob, drivers door, passenger door, and see what you get from there.

 

can also test right at the switches as well..