New Member, Looking for a little COMAND v Audio 50 help - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 08-19-2010, 08:41 PM Thread Starter
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Date registered: Aug 2010
Vehicle: 2003 Mercedes-Benz E320
Location: Nashville, TN
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New Member, Looking for a little COMAND v Audio 50 help


I've recently bought a lovely 2003 E320 (Manufacture 04/2003).

Since the purchase about 3 weeks ago, I have successfully introduced the Bluetooth dongle to the system and it works really well; soon I'll take the car to the local dealer (MB of Nashville) and have it coded so that I can do more with the phone than simply talk and listen...

I'd like the steering wheel controls, center cluster info display, phonebook access, all that good stuff.

Recently, I began investigating upgrading the Audio 50 system to a COMAND unit, with an eye toward an eventual factory nav install.

The first part of the mission for me was to pick up a head unit, which I did on eBay just a couple days ago.

It came in today and, well, I figured I'd throw it in there, see what worked and what didn't.

I installed the head unit, put the CD changer back in, did a little cleaning up/dusting off while I had all the parts lying about, etc, etc.

Put it together and viola, it worked!

I now had full Logic 7, RDS, a DVD player that worked while driving, the works.

This head unit is reported to being a 2007-2008 model; it is a Harmon Becker BE7039, MB Part Number A 211 820 41 97 "High Head Unit".

Anyway, while driving along listening to one of my fave live music DVDs, I figured I'd try out the phone.

No luck, nada.

Kind of a bummer, but not a huge deal yet; I figure coding of some sort or another will get it back to rights.

Well, being the fidgety little home tech that I am, I decided that perhaps I should try disconnecting the dongle and reconnecting it to see if that is what spurns recognition in the system.

I removed it and turned the car on and the head unit came up displaying the startup screen.

It displayed this for about 15-20 seconds, then politely shut itself off.

Of course, it did the same thing the next few times I turned it on...


So, I took the rig apart with a mind toward putting the original back in to see what it would do.

Well, the original (audio 50/cassette) is now doing the same thing and I'm getting no love from the 6-changer, either.

Is there a button push upon turning either unit on that will act as a hard reset?

Should I pull the power from the whole system via disengaging the battery for a bit to try to force a full system reset?

I had it all right there and now it's gone!

Frustrating and, well, a bit scary, though simple diagnostic thought deems the system ok at some point, as it was almost there for a few hours.

Anyone have any helpful hints?

I will be searching the audio and telematics forum as well, so I may figure this out myself, but I surely would appreciate anyone's advice.

Thanks in advance!

King Williams
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