S4 (B9 Platform) Discussion Discussion forum for the B9 Audi S4 produced from 2016-

Location of switched power circuit in the trunk

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Old 07-05-2020, 08:03 AM
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Oh yea once you get into the MOST bus the rabbit hole turns into a black hole
Old 06-15-2024, 08:34 AM
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Default Luggage compartment left fuse box photo

Originally Posted by Jorge GS
Hello,
I have a 2018 S4 B9.

I am upgrading the sound system and installing a DSP (Audison Bit One)

I am having all kinds of problems turning it on using as signal the sound from the front doors as remote (a function of the Bit One). When the bluetooth kicks in it shuts down and many times it is very hard to get it back to work.

I need a switched power source in the trunk but so far none of the ones I found in the trunk is switched, they are all constant. Plus the user manual has nothing to do with what I have in reality.

This is what the manual shows:



This is what I actually have..



I also found someone said in another forum one of the pin of a 645 relay had switched power, I tried the only one I had int eh trunk ant also does not have switched power.



Anybody knows if there is a switched line I can use in the trunk?


Thanks so much in advance.
2020 S4 So (lol) I pulled fuses from trunk area to check for a blown one when i had a free minute at work i was distracted and must have put one or more back in wrong and in true Audi fashion the manual is vague and is for ALL A4’s & S4’s so can’t find what’s wrong and I'm getting new error codes I can’t clear (had 0 errors before). Obviously i should have taken a picture first but didn’t. Any help would be greatly appreciated if someone could take a picture of theres so i can match up fuse placement i know depending on options there will be some differences but i can make sense of that way easier than a manual that encompasses EVERY A4 & S4 made since 2017! Thanks to anyone in advance








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