Chinese Specs.: Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1A79:14 (BCM) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Rear fog light circuit malfunction
Detection condition	The electrical supply unit (ESU) detects a short to ground in the rear fog light circuit.
Fail-safe	Not applicable
Possible cause	Rear fog light connector or terminal malfunction Electrical supply unit (ESU) connector or terminal malfunction Short to ground in rear fog light signal circuit Rear fog light malfunction Electrical supply unit (ESU) malfunction Body control module (BCM) malfunction
Courtesy of MAZDA MOTORS CORP.