DTC B1258-71: Rear Vent Actuator Motor Lock [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 B1258:71 [DASH-ELECTRICAL SUPPLY UNIT] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Rear vent actuator motor lock
Detection condition	The dash-electrical supply unit detects that the rear vent actuator remains operating clockwise or counterclockwise and does not stop for 8 s or more.
Fail-safe	Rear vent actuator drive signal is stopped right when the malfunction is determined.
Possible cause	Rear vent actuator malfunction A/C unit malfunction Rear vent link set malfunction Rear vent door malfunction Dash-electrical supply unit malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable