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Radar Module -Front center (MRR) - Component Failure / error code C21A909
#6
[quote pid="141" dateline="1785703017"]
Hi Freesker Support,

tried to follow your instructions, but Write VIN to the MRR is not possible, since button is inactive (screenshot 1).
I tried to read the VIN - 2 times unsuccessful (screenshot 2), but after an ECU reset and a deep sleep, I think a quick green check mark appeared - so I guess successful at least once.
Then I did the Tester Alive, and that worked (screenshot 3).
The strange thing is still, when I run the error check for the MRR once, it says timeout (screenshot 4). When I refresh it runs, and says "0 faults" (screenshot 5)
1 week ago, I also ran the "Write Role", and it was successful.

Very confusing to me.
Still I believe there is a timeout issue with the MRR. Sometimes it works (also the active front collission warning and braking), sometimes not. Due to these occasional failures I think the red ADAS warning symbol is always on.

Do you have any more idea how to Write VIN as you requested? Any chance you can activate that button for me?
Or any other procedure to do?

Again, your help is highly appreciated!

Bst rgds
Daniel
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RE: Radar Module -Front center (MRR) - Component Failure / error code C21A909 - by secretname@gmx.de - 07.08.2026, 20:21

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