Smartkey Intermittantly NOT Working C350 '09 - Mercedes-Benz Forum

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post #1 of 3 (permalink) Old 10-27-2012, 07:30 AM Thread Starter
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Date registered: Aug 2012
Vehicle: 2009 C350
Location: Los Angeles, CA
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Smartkey Intermittantly NOT Working C350 '09

Hi all,
2009 C350 here.
Drove all day yesterday without a problem. Let the car sit for an hour or so, came back and suddenly my smartkey wouldn't unlock or start the car. Tried my backup key and it wouldn't work either, so it's not the battery in the smartkey.
Let the car sit for about 20 minutes, came back and the key worked fine as if nothing ever happened.
Any ideas as to why this would happen? I did have Sirius radio turned on yesterday early afternoon, so maybe playing with signals screwed up something in the communication between the key and the car?
Many thanks for any help!
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post #2 of 3 (permalink) Old 10-27-2012, 07:31 AM
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Try the W204 forum (sedans section); maybe this has been encountered before.

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post #3 of 3 (permalink) Old 10-29-2012, 05:50 PM
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Its either the EIS (ignition switch) or the steering lock located on back of the steering column. This is a pretty common problem. There is an updated steering lock and the only way the part number can be checked is by removing it. Do you have any warranty??
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