My 2009 SV (170,000 miles) has been having issues with the door locks for the past few months. It started with the passenger front door not locking or unlocking along with the other locks. Then the issue moved to one of the rear door locks and it has recently migrated to the driver door. These issues seem to come and go depending on the temperature and humidity of the day. I tried some lubricating spray when the issue first presented itself thinking that maybe it was just gummed up a little. That didn't seem to do anything to fix the problem. The issue is the same when trying the door button, the fob and the inside lock switches.

Any ideas?

I will try the battery disconnect method tonight to see if that helps any.

 

Sounds like your master switch may be failing.

 

I have also been having an identical issue with my locks. Some days they work perfectly, some days you get nothing.