central locking,,i need help ..please...

hey guys, i need some advice and help on this issue,
my 2005 93 has developed an issue with the passenger door central locking,,it wont lock or unlock ..
so far i have changed the door lock actuator and the control panel that is part of the window switch, i have tested it all on the rear passenger door and the units all work, iv checked the plug at the door and all connections are fine, checked the wires going from the door connector to the units in the door and they are all fine,,,
the dash shows the warning "theft protection failure"..

iv tried it all,,,any one help me

thanks