DTC B10A6-64: Light Switch Error Signal Received: Notes

WARNING: This page is about a different car, the 2018 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.

DTC B10A6:64 (FRONT BODY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Light switch error signal received
Detection Condition	Front body control module (FBCM) receives the error signals from the start stop unit for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	If DTC B10A6:64 is detected when the ignition is switched ON (engine off or on), the headlight LO and the TNS (parking lights) are illuminated. If DTC B10A6:64 is cleared, the headlight LO and the TNS (parking lights) are turned off, and the operation returns to normal.
Possible Cause	Start stop unit malfunction Light switch malfunction Front body control module (FBCM) malfunction
System Wiring Diagram	Not applicable