It's a 2000 Civic Si, has 60k original miles........the passenger side power door locks and windows only work intermittently lately. Doesn't matter if I'm using the switches on my driver side or the ones on the actual passenger side door. They'll work sometimes and then sometimes not. I've checked all the wiring and fuses and everything appears good. I'm baffled, any help!? It's weird.

 

Define "checked".

 

Most people asking for help only do visual checks on them. You should know this by now. You've been here long enough.

OP, if it only happens on the passenger side, then I would say remove the door panel and inspect the connectors. A loose or corroded connector could cause your intermittent problem. I wonder if they have some type of shared ground. I would start there for sure.
How skilled are you?
Can you work a DVM?

 

I did remove the door panel, unplugged and re-plugged all the connectors, checked all the wiring was fixed and in good condition, etc.

 

$5 BUCKS says it is the driver side door connector (near the door hinge). Either the wires are pinched or the pins are corroded. 60K miles doesn't mean anything if the car is driven in colder weather. Adverse weather detoriates any car.

 

Thanks for the tip, I'll check everything once again when I get a sec and let you guys know