The car is an S80 D5 2007 automatic, so the problem is the following. Came back from driving in the evening and left the car standing, the next morning it won't start again. The text "Immobiliser See manual" on the display, the key is not handed over, it says to put it on P (although it is), and it also does not show external temp and gear lever position. Reading the following codes with Launch:

CEM-B102408 - Start Control Unit. General Failure Information. Bus Signal/Message Failures
CEM-U010000 - CEM lost communication with the engine control module. General failure information
CEM-U010100 - CEM lost communication with transmission control module. General failure information
CEM-U015500 - CEM lost communication with driver information module. General failure information
CEM-U015900 - CEM communication with parking assist module lost. General failure information
CEM-U042387 – CEM Invalid Data Received From Instrument Panel Control Module. Bus Signal/Message Failures. Missing Message
CEM-U300316 - CEM battery voltage. General electrical faults. Circuit voltage below threshold

Fuses and battery ok, anyone have any ideas on where to start?