i can't seem to find the security system but i assumed it was as well on the C280. with the Hood up i didn't hear any cranks...the moment i closed the hood it started to crank but no turnover.
i was able to reproduce this a few times, just lifting the hood and turning the key there was NO crank. i just assumed this is some sort of security system on the c280. my Remote does not work no more and hasn't functioned over 2+yrs.