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Dynavin D9 Flex install for W204 C200 Kompressor 2007 - Issue with power feeding

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Old May 9, 2026 | 01:20 PM
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Question Dynavin D9 Flex install for W204 C200 Kompressor 2007 - Issue with power feeding

Hello all,
I'm trying to install a Dynavin D9 Flex ( https://www.dynavin.de/en/products/p...c-classe-w204/ ) unit on my 2007 w204 C200 Kompressor, and am facing an issue with powering the unit:
- Without plugging the permanent 12v yellow wire, the unit doesn't turn on at all (is this normal?)
- When I plug it to the + of my battery, in the right-side of my engine compartment, it works.
- I have no idea how to run the yello cable properly from the dash to the engine bay. The fuse box is on the left-side and I feel there must be a better way.

Has anyone faced something like this? Should the unit work without the yellow permanent 12v ?
Should I use one of the fuse slots or the cigarette lighter as a backup solution?

Thank you in advance for your help.
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Old May 10, 2026 | 03:58 AM
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My idea now is run the cable into the engine compartment (left side) fusebox and plug myself either to a used or unused slot, using a fuse adapter
( https://www.amazon.fr/JatilEr-fusibl...0C4L9SQC5&th=1 )

Trying to find one providing 12v all the time (the unit turns offs after 48hr) once I receive a multimeter tomorrow.
Is this a good approach? Can I plug it safely to a slot already used with another fuse? Which slots do you reckon would be good candidates ?
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Old May 10, 2026 | 09:02 AM
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From: MA Coast
W204 2010 C300 4matic Sport M272
I really dont know the answer. I usually install aftermarket stereos in my vehicles but gave up after seeing how complicated it would be with a mercedes.

I wonder if you can tap in at the fuses to the left of the steering wheel? See if one of the slots is always on.




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Old May 12, 2026 | 07:46 AM
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Thank you for your reply.
My car doesn't have this fusebox, however by running through there, I have found an entrance through the firewall into the engine bay (driver side, EU) fuse box.
I will try to connect to one of the fuses using a fuse tap like you suggested. So far my best candidates seem to be:

36 Valid as of 1.3.11: DISTRONIC electric controller unit
Valid for model 204.902/982/984: Electrohydraulic power steering 7.5
Empty on mine

9 Glove compartment power outlet 15
Not empty.

https://fuse-box.info/mercedes-benz/...uses-and-relay
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