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      12-04-2012, 06:32 AM   #9
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Drives: 2007 E91 320d SE auto
Join Date: Jan 2009
Location: Devon, UK

Posts: 114
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Right, fixed it this morning.

I replaced and upgraded both locking fuses, 57 and 58 from 15A to 20A. Then I disconnected the battery to reset the locking module and all is now sweetness and light! It works as it did on Sunday evening.

(My wife has since admitted to unlocking/locking using the dash button several times in a row having got confused as to whether it was or was not locked! This obviously blew fuse 57.)

After posting on here yesterday I did a little more googling and found a US site that suggested disconnecting the battery to reset the system after replacing the fuses and it worked.

The upgrade of the fuses from 15A to 20A is a BMW recommended service 'fix' after many early E90/91's central locking failures. Why BMW didn't change these fuses during a normal service to prevent the problem happening on later cars and save their reputation is beyond me! Still that's big headed BMW for you.

Anyway all working now.
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