Help! 01 S500 stuck in anti theft mode
First post so forgive me if I am posting incorrectly or if I am long winded. I have a 2001 S500 and a little while back my husband locked the key in the trunk ? While trying to retrieve it I guess it went into anti theft mode. After finally retrieving the key the car will not start. It cranks but doesn't start. The alarm is unresponsive with the key fob. The key turned, dash lights came on and windows work but that's it. No other interior controls respond. Had it towed to a local repair shop (not Mercedes but specialized in them). He had it for over a month and got nothing accomplished except spending my money and time. Towed it home and began research. It was suggested that my ECM was bad so I got an ECM, EIS, key and shifter from the same car with a matching part number. Fully charged the battery and gave it a whirl. Same symptoms still exist. I'm at a loss and the car is still just sitting there. Any ideas?