Expert 2 litre hdi.No com with body comp U1118 and P1693

[The Grim Reaper]

Hello my friends.

Peugeot expert 2 litre Hdi 2008.

No start but cranks away happily.

Scanner shows
U1118 no communication with body computer.
P1693 start up request not valid.
Key is recognised.
I have checked all fuses I can find.
Checked most wiring connections and clean.
Had a look inside Bsi all looks nice N clean.

Battery has been off vehicle for quite a few months,is it possible either the ecu or bsi can loose there code or pairing ability.
Like i say KEY is recognised

Stratching head so much my hairs thinning

Any direction would be so much appreciated

[The Grim Reaper]

Just an update
I have checked all the wiring and plugs.Added additional Earth's.
It looks like it's either the main engine Ecu.BSI or BCM
There is definitely a lack of communication codes P1693 and U1118
Also I cannot hear the main relay.
Does anybody know where it is located is it in the BCM?

Can anybody advise what the most common of these parts that Fails.

Thanks