722.9 Is replacement the only option to fix "ETC/VGS control unit defective"? - Mercedes-Benz Forum

 
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post #1 of 5 (permalink) Old 03-05-2013, 01:52 PM Thread Starter
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722.9 Is replacement the only option to fix "ETC/VGS control unit defective"?

I'm learning how to use DAS and am wondering if I can flash the ETC and where I would get the code to flash it with and if it's even worth the trouble. It's the original version EHS A 220 270 14 06.

Also, the event memory says that no message was received from the central gateway control unit N93. Could that mean that there's a fault in the connection between the two? I think that would mean that the message is on the low CAN bus. Am I close?

I've done the power supply test at the ETC socket on the trans and it's got juice.

Being a motorhead is certainly not as easy as it used to be.

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post #2 of 5 (permalink) Old 03-05-2013, 01:56 PM
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Not sure what version of Xentry/DAS you are running.

Also if you on a VM version of it I strongly advise not writing any code to a control unit if a USB to serial adapter is in use. One timing hiccup by a nanosecond and your ETC would become a paperweight.
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post #3 of 5 (permalink) Old 03-06-2013, 05:22 AM Thread Starter
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I have the 09/12 version for C3 DAS. And I'm using a Dell D430 with a RS232 port in the docking station so no adapter.

For sure I have a steep learning curve here and am trying to go slowly, but in the meantime, my car is not usable.

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post #4 of 5 (permalink) Old 03-06-2013, 05:38 AM Thread Starter
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The other thing is I suppose I shouldn't mess with the old unit and save it to use to transfer the data to the new unit. Or does the new embedded code replace the old completely?
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post #5 of 5 (permalink) Old 03-06-2013, 05:29 PM
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I am nit sure. They call it an update, but it may just overwrite the whole thing.

What it won't do is change the data needed for it to be associated to your VIN and transmission number.

With a version Xentry that recent you may need a password to do SCN version coding for each module(in this case the ETC). Just one more thing MB and Terradyne have done to try and thwart clones.
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