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PCM Blank no ac/heat either

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2006 Cayenne Titanium S started losing voltage from not driving..replaced battery under seat...Car was sitting for 2 years...No aux battery in trunk.Car starts runs fine with new battery.. but..Car has blank PCM screen..radio is very muffled sounding and quiet,only can change radio from steering wheel not blank PCM..,cd player in PCM works but like radio very low sound..rear hatch does not open or click..ac /heat blower not working and its blank too..Key batterys were dead..replaced both battery's and does not work to lock unlock doors or hatch with new key battery's.. PSM light on too.(Its not in off mode).tried 148 code and the main and trip hold on PCM..checked all fuses and pulled and replaced all fuses,all 3 fuse areas getting above 12v with key turned on...Nada..45k miles almost mint Florida weather car..


Thinking about icarsoft scanner for Porsche...dont want to spend to much if this could work on scanning my problem..  any help is truly appreciated..


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