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Home >> Mazda >> 2015 >> 3 SV, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic - Front Body Control Module (FBCM) >> DTC B134D 02: Headlight Control Signal Error >> Notes
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DTC B134D 02: Headlight Control Signal Error: Notes

DTC B134D 02 DETECTION CONDITION AND POSSIBLE CAUSE

Description  Headlight control signal error 
Detection condition 
  • Front body control module (FBCM) receives the error signal from the start stop unit for 5 s or more  with the ignition switched ON (engine off or on).
Fail-safe function 
  • If DTC B134D:02 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS are illuminated.
  • If DTC B134D:02 is cleared, the headlight LO and the TNS are turned off, and the operation returns to normal.
Possible cause 
  • DTCs are stored in the start stop unit.
  • Front body control module (FBCM) malfunction
System wiring diagram  Not applicable