Steering wheel buttons do not work on the left side

Tiny
GURI123
  • MEMBER
  • 2005 MERCEDES BENZ E320
  • 6 CYL
  • TURBO
  • AUTOMATIC
  • 150,000 MILES
I have a w211 320 CDI 2005 Mercedes and the buttons on the left of the steering wheel do not work, only the buttons with +- works.

Please help me I don't know what to do. I want to see fuel consumption and many others malfunctions.
Friday, May 17th, 2019 AT 7:26 AM

1 Reply

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Hi Guri,

These buttons are an input to the steering wheel control module and then the SCM sends the message to the appropriate module like the cluster or radio.

I attached the diagnostic for when this happens. Most likely the steering column control module is the issue but this should be confirmed prior to replacing it. The way to confirm this is to hook up a scan tool and see if when the button is pressed, the steering column control "sees" the button being pressed.

Also, you may have a code in the system indicating the SCM has failed. I attached a TSB that indicates this is a common issue. It appears the module fails because of static discharge from the driver's finger and the button shorts out the module. The only correction for this is the replace the module. However, just be careful if you are going to replace this yourself because it appears that it needs to be initialized with a scan tool.

Please let me know if you need anything else. Thanks
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Saturday, May 18th, 2019 AT 10:40 AM

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