My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
If anything after market has been installed there is a chance the after market component is shorting out internally or that there is a wiring fault from the after market component if it is tied into this 5 amp fuse that is causing this here.
This 5 amp circuit feeds these components (and some I was unable to locate the component name)
N10/8 Rear SAM control module
B123/4 Emergency call control module (Teleaid/Mbrace control unit).
This is a fuse controlled by the ignition that sends voltage with the key on or engine running.It is a low voltage circuit still feeding 12 volts to these components but these components not drawing very many amps through this circuit this is why it is a 5 amp fuse.
One place you can get a complete diagram for your model here for a small fee that is good for one year and covers all diagrams,repair and diagnosis info for your model is https://www.alldatadiy.com/.
I suspect one of these components is causing the short needing replaced or wiring is pinched leading to one of these components from the fuse itself.
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