The fact that anything else works is absolutely no gauge of whether your battery can energize the starter. I do not suggest jumping these cars. Rapid voltage changes from bad connections can take out controllers as they boot and fail to boot quickly over and over. Try plugging your PC in through a switch and open and close it like a set of flashing lights and see what happens to your info.

If you can't verify battery volatge while attempting to crank the car, you are advised to seek someone who can. Putting a ngood battery in is also a plan but you also will loose numerous memories and an occasional SAM.

If the battery voltage is OK while attempting to crank, verify the gear position in the instrument cluster. A shift module not talking would not tell that it's in park.

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician