DTC B1258-87: Communication Error With Rear Vent Actuator [Dash-Electrical Supply Unit (Us)]: 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 B1258:87 [DASH-ELECTRICAL SUPPLY UNIT (US)] DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Communication error with rear vent actuator |
| Detection condition |
- The dash-electrical supply unit cannot receive the signals from the rear vent actuator.
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| Fail-safe |
- Rear vent actuator drive signal is stopped right when the malfunction is determined.
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| Possible cause |
- Dash-electrical supply unit power supply circuit malfunction
- Rear vent actuator connector or terminal malfunction
- Dash-electrical supply unit connector or terminal malfunction
- Short to ground in rear vent actuator LIN communication line
- Short to power supply in rear vent actuator LIN communication line
- Open circuit in rear vent actuator LIN communication line
- Rear vent actuator malfunction
- Dash-electrical supply unit malfunction
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 Courtesy of MAZDA MOTORS CORP.
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