navigation and radio - on/off button on several time but nothing illuminates?

2006 MERCEDES BENZ SL500
V8 • 2WD • AUTOMATIC
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PAULD1
  • MEMBER
  • 1 POST
I did try turning the on/off button on several time but nothing illuminates. I have replaced the rear battery in the trunk off the car just in case. but it didn't make a difference.
Dec 19, 2010 at 4:19 PM
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SQM
  • ✓ASE Certified Mechanic
  • 6,383 POSTS
  • ASE Certified Mechanic
Hello,

It could be caused by a burnt fuse. That should be the first item that you should check.

There is a fuse block located behind the passenger seat.
Check these fuses:
#59 - 5A
#66 - 25A
#77 - 20A

https://www.2carpros.com/articles/how-to-check-a-car-fuse

If the fuses are good the it could be a faulty module for the radio unit. This vehicle has a control unit for the radio/navigation. That unit could have burnt circuit board that triggering the issue you are having.

Please let me know of any questions.

Thank you.
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Aug 21, 2021 at 11:08 AM
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