Crank and stalls

Randy Diagnostician California Posted   Latest   Edited  
Resolved
Driveability
2008 Mercedes-Benz C300 3.0L (272.947) 6-spd (716.6) — WDDGF54XX8F133137
No Crank / No Start

I have this c300 car will crank and run for 1 second and then stalls . when this happens the instrument cluster goes dead and you loss circuit 15 for relays in front same box . cycle the key and every thing starts working again in tell you crank it again . Any ideas thanks in advance 

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Interesting
George Diagnostician
British Columbia
George Default
 

Have you performed a complete scan for codes can you connect to ecm?

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Randy Diagnostician
California
Randy Default
 

no codes any modules

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George Diagnostician
British Columbia
George Default
 

Do you have tool to check transponder in key and what type of key do you have ie aftermarket or factory

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Randy Diagnostician
California
Randy Default
 

Yes I have checked the key and it is oem

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Robert Owner/Technician
Florida
Robert Default
 

Check the battery!

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Randy Diagnostician
California
Randy Default
 

battery good

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Michael Mechanic
Texas
Michael Default
 

Does it have fuses or breakers? If breakers... maybe weak breaker feeding the 15 circuit. If 15 circuit feeds the run relay possibly weak relay...? I don't work on Mercedes much. Recently had an older jeep that had similar issue... it would run for awhile intermittently, then @ times would experience these symptoms. No faults. Just die like no signal. Finally caught it running and messed with…

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Randy Diagnostician
California
Randy Default
 

Does not use breakers . And relays have been swapped

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Michael Diagnostician
Illinois
Michael Default
 

You got any scan or scope data to share?

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Randy Diagnostician
California
Randy Default
 

Scope what ? Scan data all looks good no codes the only scan data thats weird is in the electronic ignition switch it shows 5 pids for circuit 15 . With key on all are active when you crank pids go in active

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Michael Diagnostician
Illinois
Michael Default
 

Got a wiring schematic I can see?

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Randy Diagnostician
California
Randy Default
 

here are some

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Randy Diagnostician
California
Randy Default
 

here are some more

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Nicholas Diagnostician
New York
Nicholas Default
 

I would check the Front prefuse box.

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Randy Diagnostician
California
Randy Default
 

That was my thought but my friend at mb said it could not be that do to losing circuit 15

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Randy Diagnostician
California
Randy Resolution
 

It turned out front sam module . Just waiting to post to see if car came back for other problems . All good at this time

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