FYI
C70: Passenger door wouldn't unlock, not with fob, inside release handle, or metal key.
Found this solution here (3rd down) from Alpha206, who credited "oilburner":
http://www.volvoforums.org.uk/showthread.php?t=40932
Seems one stage away from turning round anticlockwise three times and spitting, but having performed the ritual, the door released...
Here it is:
Try performing a reset of the UEM (Upper Electronic Module), this controls the door locks and window operation:
- Close all of the doors and bonnet.
- Key in position II engine not running.
- Hold both the driver window and passenger window switches in the driver door panel in the closed or up position for 5 to 8 seconds after the windows are closed.
- Release buttons.
- Remove the ignition key.
- Operated the remote twice. lock/unlock lock/unlock.
This will reset the UEM brain. This can correct faulty operation of the sunroof and/or erratic door lock function.