It looks like from your first reading the switch is open. This means you are out of refrigerant.
The next readings say that the PBC is pulling the Klima to ground. I can't say from these why the comp doesn't come on with the low pressure switch jumped.
I would verify the switch/pressure thing first, although from what you are saying it won't work even when it does have pressure.
Bosch Master, ASE Master, L1
33 years MB technician