you said the unlock/lock seq - did you resync the key? If the battery drained enough the car may be in "lock out mode" - assuming you tried to steal the car. Something about unlocking and starting within a few seconds but you may need the jumpers on at the same time. How much voltage is coming off your battery?

Just a suggestion-

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1991 190E 311K [Brilliant Silver/Black MBTEx] -retired
1996 E300 315K [Black/Grey MBTex]

Want to put a tank in the trunk for WVO/SVO in the E300 Need to find a place to store my OIL!
Still procrastinating about the biodiesel/WVO
Made some biodiesel but so afraid to pour it all in - I've added some and think I'll supplement my fuel to see how I make out

Made some biodiesel but the process scares me - methanol fumes are not your friend! Need to do this outside.