Just looked at some diagrams. Freeking complex unit, operating almost anything in the car. Including driving directly the instrument panel.

The 31 32 pins your are reffering are like pins F1 and F2 -battery input. ALso tons of inputs that wake up the module. I guess it goes to sleep when all is quiet, and the car is locked.

Some interesting pin is d6 -diagnostic enable. Goes to DLC terminal 12. Likely when it is grounded or resistored like 4-10kohm it runs some tests.