DTC B1258-4B: Abnormal Rear Vent Actuator Temperature [Dash-Electrical Supply Unit]: 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 B1258:4B [DASH-ELECTRICAL SUPPLY UNIT] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Abnormal rear vent actuator temperature
Detection condition	The dash-electrical supply unit detects an abnormally high temperature condition in the rear vent actuator.
Fail-safe	Rear vent actuator drive signal is stopped right when the malfunction is determined.
Possible cause	Rear vent actuator malfunction Dash-electrical supply unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable