M-Class (W163) Produced 1998-2005: ML 230, ML 320, ML 350, ML 400 CDI, ML 430, ML 500, ML 270 CDI

ML320 Bose radio won’t take code

Old Jul 30, 2019 | 05:50 PM
  #1  
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2011 E350 4Matic wagon
ML320 Bose radio won’t take code

I’ve verified the code at two dealers, but can’t seem to find anything by searching about the code entry procedure. Radio flashes CODE, C flashing. I enter all 5 digits and the first number flashes. Can’t figure what to push to verify the code. I tried SCAN, MODE, power button, SEL, WB. I surrender. Help!
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Old Jul 30, 2019 | 06:15 PM
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This procedure does not work?

OR this one.
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Old Jul 30, 2019 | 06:20 PM
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Originally Posted by khomer2
No. I don’t have a SEEK button, and the SCAN button just sends me back to either flashing CODE or the dreaded WAIT
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Old Jul 30, 2019 | 06:30 PM
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Originally Posted by luvdubs
No. I don’t have a SEEK button, and the SCAN button just sends me back to either flashing CODE or the dreaded WAIT
seek or scan button are the same thing/function.
Strange, then the radio code must be incorrect? (thinking aloud here) :|

For the 2nd link I provided, you've read the entire procedure - It may have locked you out for a time period depending on how many attempts you have tried.
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Old Jul 30, 2019 | 06:42 PM
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The real kicker is that I have an identical head unit that was working. After a battery disconnect neither head unit will take its respective code. I now have two Bose head units, neither of which will take the code I was given for it.
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Old Jul 30, 2019 | 06:45 PM
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Originally Posted by luvdubs
The real kicker is that I have an identical head unit that was working. After a battery disconnect neither head unit will take its respective code. I now have two Bose head units, neither of which will take the code I was given for it.
You may need to keep the din unit connected for power until it cycles thru the time protection and then try the radio code again.
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Old Jul 31, 2019 | 04:28 AM
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Prior to this problem, did you ever disconnect the battery?

Have you ever successfully entered the radio code?
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Old Aug 2, 2019 | 12:19 PM
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Originally Posted by Maj. Dundee
Prior to this problem, did you ever disconnect the battery?

Have you ever successfully entered the radio code?
I have, but my son lost that code. I’ve now called 5 different MB service departments and have been given 5 different codes for the serial number on the head unit.
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Old Aug 2, 2019 | 01:59 PM
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Call M/B directly.
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Old Aug 2, 2019 | 07:55 PM
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Thanks for the help! The sixth dealer I called, Mercedes Benz of Chicago gave me a sixth code and it worked!
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