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Radio will not turn off and screen is frozen saying diagnosis

Tiny
RY524
  • MEMBER
  • 2007 MERCEDES BENZ R350
  • V6
  • 2WD
  • AUTOMATIC
  • 145,000 MILES
Radio will not turn off even after keys are not in the ignition. Stays on constantly. Just got it back from the mechanic who replaced the whole A/C unit as well as brakes and rotors. Never had this problem before.
Thursday, June 11th, 2020 AT 8:23 PM

8 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
Hello,

It sounds like something was not reconnected. We need to do a CAN scan to see what's going on, this video will show you how. In the video to says you need a subscription but you don't anymore with the scanners from Amazon. CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $50.00. here is a video to show you how:

https://youtu.be/InIlnsjOVFA

Please let us know what you find. We are interested to see what it is.
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Friday, June 12th, 2020 AT 11:03 AM
Tiny
RY524
  • MEMBER
  • 4 POSTS
I wasn't very descriptive in my question. The radio is on constantly but the radio display reads diagnosis and does not function, also, the dash cluster reads diagnosis as well. I've tried the fuses and they are all fine. Called Mercedes dealership and they said it sounds like it could be a module failure. I'm not very familiar with car parts besides the basics. Would a failed module do that?
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Friday, June 12th, 2020 AT 1:58 PM
Tiny
RY524
  • MEMBER
  • 4 POSTS
Could it possibly be my radio anti theft is on and locked me out of the radio?
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Friday, June 12th, 2020 AT 1:59 PM
Tiny
RY524
  • MEMBER
  • 4 POSTS
I fixed it! It was the radio anti theft lock. I found the steps on a Mercedes support page and it worked. Thank you for the help!
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Friday, June 12th, 2020 AT 5:29 PM
Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
Thanks for the update. I am sure that info will help others as I am sure you are not the only one that has had that issue.

Please come back to 2CarPros in the future if you need more help. Thanks
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Monday, June 15th, 2020 AT 5:43 PM
Tiny
IZZY PICHARDO
  • MEMBER
  • 1 POST
Hey, do you have the link of the support group or can you tell me how you got rid of the “diagnosis” screen?
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Monday, November 9th, 2020 AT 1:23 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,940 POSTS
Can you tell me what support page or provide the link? I have the same problem?
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Wednesday, November 11th, 2020 AT 4:34 PM

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