Date registered: Oct 2010
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Possible alarm/immobiliser problem???
I have a 1996 C220 with what I believe is an immobiliser problem.
First off, I had a problem with turning the key (blade key) so I used brute force to get
it to turn. After that sometimes it turned just fine and other times I had to force it again.
That was a year ago. Now all of a sudden the car will not
start. I can turn the key so that all of the lights (and everything electrical) can turn
on but when I turn it all the way nothing happens at all. The red and green lights on the
review mirror flash alternately.
Note: The gas gauge has not been working properly for a couple of months. Sometimes it shows
empty and sometimes it shows the correct amount of gas.
Things I have tried
I have tried locking and unlocking the doors with the button on the fob as well as
manually through the driver's door and trunk. When I use the key fob everything looks
normal as far as the system appearing to arm itself (red flashing light for lock, green
for unlock). I have tried to "reset" the system (holding down "O" button and turning the key etc), though I don't think I did it correctly.
I have unhooked the battery for 20 mins. Nothing has worked.
I even removed the foot plate from the passenger side footwell and removed all the
units that I believed were part of the immobiliser. I have put them back in.
The short of it is, I have spent days researching an answer and I have tried many
different suggestions. I've now reached a point where I've tried so many things
that I don't even remember what I've done. I paid a visit to a mercedes dealership
and their answer was "we are not quite sure what the problem is".
So now I'm a little bit confused and frustrated and don't know what to do next.
Any help would be greatly appreciated.
PS: I'm sorry for the long post but I just didn't want to risk leaving out
any details that may be helpful.