Mercedes B Klasse Electric Audio Problems MOST Bus Fault

A MOST bus fault Oh dear that sounds like chasing gremlins in your car electronics Think of the MOST bus as the nervous system of your car's infotainment – if one nerve is pinched the whole system can go haywire The symptoms you describe definitely point to a break in the optical loop Before you commit to that repair bill a few questions Has this happened suddenly or did it develop gradually Have you had any recent work done on the car's electrics or audio system Any aftermarket modifications installed

It happened suddenly No recent work or aftermarket stuff Is there anything I can check myself before shelling out for a new control unit

Sudden failure and no recent work hmm While a DIY fix is possible diagnosing MOST bus issues without specialized tools can be tricky You're essentially looking for a broken fiber optic cable or a malfunctioning module in the loop Since you don't have gradual degradation the chances of a loose connection are probably low Given the cost involved and the complexity of car diagnostics these days honestly I'd advise getting a professional diagnosis A proper scan with Mercedes-specific diagnostic equipment will pinpoint the faulty component Could save you money in the long run versus replacing parts blindly

Yeah that's what I figured Bit the bullet and took it to a specialist Turns out it WAS a faulty control unit on the MOST bus just like I suspected They replaced it cleared the codes and everything is working again Thanks for confirming my fears and the advice