DTC B134D-02; Headlight Control Signal Error: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & 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