[Chuchuf]

I just went through this intermittent failure mode on my passenger window.
What I did was to pull all the connections off both the drivers and passengers window switches one at a time and made sure they were clean and tight.
After that I sprayed some contact cleaner in the switches (you can do it from the front of the switch with it in the up and down position which allows you to spray inside). Once sprayed I rocked the switches between the up and down positions to clean the contacts.
Need less to say I did all this with the key off and battery disconnected and waited 30 min or so for the switch to dry before trying the switch.
While I was at it I also did the drivers switch (ounce of prevention and all that)
Seems fine now.
If this doesn't work try what Darren said above about swapping the drivers and passengers switch.
Terry