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Key fob locking 2004 Nissan Micra?

My Micra (K12 - 2004 1.2SE) will not always lock on the key fob. Unlock is fine.
It is the same with both fobs & I have renewed the fob battery.

I wonder if Nissan made modifications to the system as my hand book tells me that I can open each door individually from the fob. One press drivers door, Two presses passengers door & so on.
From buying the car the "Open" button operated all doors
On the windscreen there is a box which the rear view mirror is fitted to this has wiring going to it.
Could this be part of the remote locking system? Antenna?
The reason I ask is that the problem started shortly after I replaced the base of the radio aerial & the internal leads are in the vicinity of each other.
If need be how do I remove this cover / mirror? I can find no reference to it.
roger, November 2010
Still got my locking problem but the unit on the screen is the Rain sensor for the wipers.

My thanks to the Micra Sports Club for that.

roger, November 2010
link Click here to see other fixes for Nissan Micra.