SOURCE: 307 central locking fault
If you have replaced the battery and the ecu wasn't in sleep mode, then you'll lose the synchronisation between immobiliser and fob. go to peugeot dealer or call out a car locksmith who then can reprogram your fob with car ecu. I have read the method in internet but not sure what the steps were. you can google it may be you'll find it.
SOURCE: my daughters central locking on her 2000 peugeot
Yes it is a relay
Is water getting in the central locking relay? sounds like it, remove it dry it...........open it and get the water out if nessesery! then stop the leak or re-locate the relay away from the water!
also can be worn lock in the drivers door or bad door actuator (MASTER)
All quite easy to fix don't worry too much!
Have a good one......Bruce
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