Focus Mk3 Key Problems

[James1884]

This is my first post and I'm an absolute novice.
I am currently storing a SORNed 14 reg Focus Zetec S TDCI (50K mileage)
I have discovered water lying in the spare wheel well which I hope to cure by re-sealing the vents behind the bumper.
However, both passive keys have suddenly stopped operating the central locking AND the start/stop switch.
I have replaced both passive key batteries and the car battery starts the car without a problem once I have gained entry with the key blade and inserted the key into the key holder.
I'm unsure if the damp/key problems are connected or if there is anything I can do about the key problem prior to putting the car back on the road and having a diagnostic check carried out.

[StephenFord]

30 minutes ago, James1884 said:

This is my first post and I'm an absolute novice.

If you have access to a multi meter, report back with the voltage your battery is kicking out (engine not running)...