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Radio will not turn on 2010 C300 4Matic

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Old Oct 19, 2021 | 06:06 PM
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2009 C63 AMG
Radio will not turn on 2010 C300 4Matic

Hello all,

I had a 2010 C300 4Matic that was in the garage for 2 years without being turned on at all. Went to the mechanic, got a new battery, changed all fluids and its good to go except the radio will not turn on. I checked fuse 26 and 84 and replaced them anyways and still no luck. Any tips?

Also checked the fuse behind the head unit.

Last edited by jannesari; Oct 19, 2021 at 07:06 PM.
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Old Oct 19, 2021 | 09:30 PM
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Originally Posted by Plutoe
have you tested the voltage in--------do you or dont you
Not sure how to, i have a voltage meter though. How would i go about that?
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Old Oct 20, 2021 | 09:09 PM
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Back when stealing radios out of cars was the big thing, radios were being designed such that if they were disconnected from the battery, they would go brain dead, thus discouraging theft. A dead battery would induce the same dead state. Your radio docs might have some activation key and procedure. Else visit a dealer for assistance.
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Old Oct 21, 2021 | 03:02 PM
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Originally Posted by streborx
Back when stealing radios out of cars was the big thing, radios were being designed such that if they were disconnected from the battery, they would go brain dead, thus discouraging theft. A dead battery would induce the same dead state. Your radio docs might have some activation key and procedure. Else visit a dealer for assistance.
Not this any more on a 2010 Mercedes. Radios are coded to the car VIN and stored on a non-volatile memory. The code kicks in if the radio is put to a different car.

I guess Plutoe means measure the voltage supply from the radio connector to be sure wiring is fine.

EDIT: is the display dead? Checked fuse #11 too?

Last edited by Diesel Benz; Oct 21, 2021 at 03:17 PM.
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Old Oct 21, 2021 | 09:05 PM
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Have you verified that everything else electrical -- windows, seats, lights, etc. -- operate normally?
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