I recently purchased a 2007 Accord. The door locks will all unlock when using the master switch on the Drivers door, but will not lock. No sound from any of them. I can lock them by manually pushing the lock down on each door. My fob won't unlock or lock them. Using the key I can lock and unlock the drivers door, but it won't lock/unlock all the others from the Drivers door lock. (only key lock on the car from the outside)
I'm kinda lost on what could be wrong as all doors will unlock but not lock.
While driving no indicator on the dash that any doors are open either.

 

UPDATE So it will unlock and lock if the car is on, but won't when its off.