W222 2013 Restraint system malfunction fault code B301 terminal 30 open circuit permanent - any ideas

Neillwilliams

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Dec 4, 2023
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Your Mercedes
W222 S350L
Hi all

My S Class W222 S350 LD has been fantastic apart from an oil leek causing the serpentine belt to snap 3 times. Oil leak is now fixed so hope we will not be stranded again.

I now have a "restraint system malfunction, consult workshop" warning.

My local workshop are normally very good and found fault code B301 and terminal 30 open circuit, permanent with their fault reader.

They have had the car for months and cannot solve it so I have collected it today to take it to the dreaded main dealer unless anyone here can save me a HUGE bill.

Can anyone provide me with more information and possible cause/fix?

Thank you all in advance

Neill
 

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