N/S/R door does not lock and alarm is set off

[squre1970]

Hi All, the passenger rear door does not lock with remote or with the internal locking switch on the drivers door. The electric window works and the red door light works. I have changed the door module as well but no joy. it was working fine 2 weeks ago and then just suddenly stopped. i cannot see any broken wires in the door joint either and continuity test say the wires are fine. any help will be appreciated. 

[cliffcoggin]

Can we assume you have tested the fuse?

Have you checked the mechanical parts of the door lock to ensure they are not jammed?

[Sid2020]

Central locking solenoid is built into the lock mechanism and is a common failing , if it’s not totally failed you might hear a slight rumbling from it but won’t have the power to engage the lock.