No power with jump box?

Tiny
TERRY KEEMER
  • MEMBER
  • 2013 MERCEDES BENZ CLS550
  • 4.6L
  • V8
  • TURBO
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
My car dashboard lights will not come on and my car isn't getting any power when I tried to jump it. It just clicks from one of the relays and the sos light is blinking. What could be the problem? My 2013 Cls 550 want start after jumping with a jump box there isn't any dash lights it's like I have on power at all know and the sos button by the rearview mirror is blinking.
Monday, July 25th, 2022 AT 7:12 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,506 POSTS
This could be the battery is so dead it will not allow the jumpbox to work. Remove the jump box and use a voltameter to see how many volts the battery has naturally. It should have at least 10.5 volts or the jumper wont work. This guide can help

https://www.2carpros.com/articles/how-to-use-a-voltmeter

If that checks out there is a main relay that I would check use a CAN scanner because I have also seen the SAM module go out which can cause this issue as well you can get a CAN scanner from Amazon for about $30.00 here is a video to show you how.

https://youtu.be/u-4syLc-ifQ

here is a scanner link

https://amzn.to/3o41KcZ

I have included how to change the SAM module out in the diagrams below. Check out the diagrams (Below). Let us know what happens and please upload pictures or videos of the problem.
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Monday, July 25th, 2022 AT 4:45 PM

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