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2009 W204 no ignition, electrical issue

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Old May 24, 2019 | 12:34 PM
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xchn's Avatar
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c300 w204
2009 W204 no ignition, electrical issue

hi guys, I need some help

my battery died after leaving it for a month, when i tried to start a bunch of lights came on, so i left it.
the next time i tried boost and I may have boosted while leaving the key in the ignition, I can't recall

anyways, the car is dead after that. no lights, no power, does not respond to key unlock or lock
now car battery is good
does not respond to key press, doors do not unlock
car does not start, no dash lights or any display, but steering wheel unlocks when key inserted, i hear the servo unlock
fuses ok
interior lights do not light
battery currently disconnected, when connected alarm goes off, since door had to be opened manually


any ideas guys? i dont want to toe this to dealership, its going to cost more than the car.
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Old May 24, 2019 | 02:45 PM
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From: Milwaukee, WI USA
2012 C300 4Matic
When you say "now car battery is good" do you mean you bought a new battery? Or just charged the old one? If it is the latter you may want to first buy a new battery.

As for the alarm, would it turn off if you hit the buttons on the fob?
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Old Aug 11, 2019 | 03:05 PM
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c300 w204
nothing to do with battery
battery is fine,

like i said the KEY buttons does nothing, however, inserting the key into the ignition will unlock the steering wheel.
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Old Aug 11, 2019 | 03:08 PM
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c300 w204
you can see the video of the problem in this video


Last edited by xchn; Aug 11, 2019 at 03:11 PM.
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Old Aug 11, 2019 | 03:11 PM
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c300 w204
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