Crank and stalls

Randy Diagnostician Glendora, California Posted   Latest   Edited  
Question
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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George Diagnostician
Burnaby, British Columbia
George Default
 

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

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Randy Diagnostician
Glendora, California
Randy Default
 

no codes any modules

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George Diagnostician
Burnaby, 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
Glendora, California
Randy Default
 

Yes I have checked the key and it is oem

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Robert Owner/Technician
Tarpon Springs, Florida
Robert Default
 

Check the battery!

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Randy Diagnostician
Glendora, California
Randy Default
 

battery good

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Michael Mechanic
Montgomery, 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
Glendora, California
Randy Default
 

Does not use breakers . And relays have been swapped

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Michael Diagnostician
Champaign, Illinois
Michael Default
 

You got any scan or scope data to share?

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Randy Diagnostician
Glendora, 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
Champaign, Illinois
Michael Default
 

Got a wiring schematic I can see?

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Randy Diagnostician
Glendora, California
Randy Default
 

here are some

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Randy Diagnostician
Glendora, California
Randy Default
 

here are some more

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Nicholas Diagnostician
Brooklyn, New York
Nicholas Default
 

I would check the Front prefuse box.

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Randy Diagnostician
Glendora, 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
Glendora, 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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