2008 A170 won't start

  mercedes/class/2004-2012

Hi. 

My 2008 A170 wont start. It says SRS malfunction on display. Drive to nearest workshop but it won't start. Engine just makes a tick noise but no turnover whatsoever. I did check the battery which was replaced a few months ago and it says fully charged. Any idea as to what might be wrong? 

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