Possible Cause

WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Open circuit in wiring harness between the following terminals:
- Start stop unit terminal 1H and push button start terminal C
- Start stop unit terminal 2J and push button start terminal I
- Start stop unit terminal 1AF and ground
- Start stop unit terminal 2B and ground