[Bmwguyosk]

Edit: I have solved/fixed the problem

The problem of having no power to the fuses that power the radio-
The fix for me was - if replacing the fuse box to a new one,
Dont forget these 2 fuses. (Pic in attachment) zoom in!
Black lookin fuses deep in the fuse box.

Originally Posted by ctuna

https://www.google.com/url?sa=t&rct=...,d.cGU&cad=rja

You need to measure the voltage on the line that feeds the Head Unit and follow it back.
BMW diagnostics like Inpa and Ista D would help.

Im doing some diagnostic on my brothers 328xi 2009 e90
Car had no power what so ever.
Replaced ground strap under front wheel(was completely broken)
Replaced b+ wire and fuse box.

Car works mostly

Now the radio wont turn on. Most fuses are 12v+, but no 12v to the fuses that supply to the HU (tested connector behind HU and fuses) im getting 353mV back there

Tried with and without Ibs plugged in

everything else is working

Still no luck. Whats next in line to the HU power connector, is it directly to the fuse 14?
The fuses are not showing 12v

Thanks ahead of time if you take the time to read this^^

Oh, i also have Ista + , inpa, multimeters, and so on.