When flipping the power lock switches on the driver and passenger doors, they unlock the front doors, but the side door and rear door do not lock/unlock.

Sometimes I'll hear a noise near the rear door which sounds like it is trying to unlock, but it does not...I typically notice this happening a long time after I have flipped the power lock switch on one of the front doors.

I have a '97 Ram van.

This is not related to Keyless/remote entry...I do not have that.

thanks for your help!

 

On my '89 there are 4 contacts on each set of doors.

When the doors are closed these contacts touch and allow current to pass.

These contacts oxidize. I hit them with a wire brush and make em look like copper again, then they are good for another 6 months.

Sometimes they click but do not operate the locks, until I clean them.

On my back doors, I've had to pull these contacts out a little bit so they touch firmer with the door closed.

 

After you get the contacts brushed down to shiny copper smear a little clear silicone grease on them. You will get six years of correct lock performance instead of only six months if you grease the contacts.