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DTC B13C3 04: LF Control Unit Internal Malfunction: Notes

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.
DTC B13C3:04 (ADVANCED KEYLESS ENTRY SYSTEM) DETECTION CONDITION AND POSSIBLE CAUSES

Description  LF control unit internal malfunction 
Detection condition 
  • Start stop unit detects the LF control unit internal malfunction.
Fail-safe function 
  • Inhibits the door lock/unlock control using the advanced keyless entry system.
Possible cause 
  • LF control unit internal malfunction
  • Start stop unit malfunction
System wiring diagram  Not applicable