I have a 01 Blazer 4x4. Power everything. When all the locks are locked all of the switches go up, But when I hit the button for the locks to unlock all go down except the driver door switch. I took off the door panel to see if anything was loose and sprayed some WD-40 and still the same problem. I'm puzzled??? Could this be a bad actuator? Please help me out if you can. Iv'e done everything but hit the thing with a hammer lol.

Thanks,
T

 

Could be a bad actuator, but more likely is a sticking lock. You may have to remove the complete latch assembly to clean and lube it as a whole.