Question about 2007 Mercedes-Benz S550 Sedan
Dropped it in dish water
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Posted on Jan 02, 2017
Do you have another key?
If yes, try with another key.
If the same problem persists with the new key, its unlikely to be a key issue. The starter system is fairly complex & needs diagnosing on a diagnostic tool such as Mercedes STAR diagnosis.
The EIS (Electronic Ignition Switch) reads the key information & sends a signal to the engine ECU to start (assuming it recognizes the correct key), the ECU then sends a signal to the starter to start the engine. The problem could be anywhere in between these components.
The EIS is a fairly common part for failure but this needs to be checked for fault codes & actual value readings to check the status of the switch.
I would take it back to the dealer for them to investigate as soon as possible as there is a chance it could fail completely leaving you in a stranded situation.
Let me know,if needed further assistance.
Hope i helped you.
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Posted on Jan 11, 2011
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