Charging System Diagnosis for Auxiliary Battery , Mercedes (W164)

[@BenzAddiction]

Sorry that the repairs are getting more technical, but I haven't seen any video on this, but many Mercedes owners have had this issue that I am hoping to solve... comments and feedback are welcomed and appreciated. Thanks for watching 👀

[@Brian_L_5168]

Great hack! SAM controls many things, if your SAM no longer charging aux battery, what other functions are not working in your SAM? I am afraid there are still hidden issues?

[@BenzAddiction]

Thanks mate, I have no other fault code on SAM, that's why I don't like to replace it only for not charging the Aux battery.

[@admin6228]

@@BenzAddiction What is the function of the SAM module ? What are the chances of having a potentially failing voltage regulator in the Alternator?

[@paulopalma-condesso8206]

Thanks! Who knows, someday, it will help me too.

[@BenzAddiction]

Thank you, yes, who knows...

[@blackhat356]

Thanks for this informative video. I am hoping you can help me with a similar prob! I have a plug-in hybrid C350e 2017. the car's auxiliary battery, main battery, and starter motor are new. However, I still get the error "Stop Vehicle. Leave the engine running". Occasionally, the car also shows the warning: "Collision Prevention Assist Plus inoperative" I placed the car on a scanner and only one error shows: U301700 - The real-time Internal Control Unit Clock Has A Malfunction. Do you have any idea what might be causing this?

[@BenzAddiction]

Trickle charge your 12v battery overnight and see if you get this error driving after?

[@blackhat356]

Thanks for the advice, I will try that! Do you think there is a bad fuse somewhere causing this?

[@BenzAddiction]

@blackhat356 it might be anything from dirty 12v battery poles to, bad charging system, to a not compatible battery.

[@francoisrossouw1769]

Why is the yellow engine warning light on now?

[@BenzAddiction]

P0014 and P0015 cam related.

[@allanriches9381]

good work around,what is check engine light on for.

[@BenzAddiction]

Thanks Allan, you know early M272 loves to throw p0016 and p0017... 4 cam sensors, 4 cam magnets, low quality balancer shaft sprocket, you know why I love M112 and M113? Gotta stick to those, but I had to experience this for myself!!!

[@allanriches9381]

@@BenzAddiction yes just bought a w210 wagon with the m113 430 in it , what a great car

[@BenzAddiction]

@allanriches9381 Great choice Allan, such a classic look, still decent quality great ride, and bullet proof engine and trans. Please keep sharing with us your experience, I am sure I will buy one, one day.