door locking system

e200 est 2001 central locking not working at all i have to manually lock all doors internal switch not locking key fob flashes as do indicators when fob is pressed alarm system not working either i have changed unit under rear seat with all the pipes on still nothing is there a control unit or relay and where are they? right hand drive
many thanks

Add new comment

The content of this field is kept private and will not be shown publicly.