DTC B1B46-49: Rear Ultrasonic Sensor (RH) Power Supply Circuit Malfunction (Parking Assist Unit (Ultrasonic)): 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 B1B46:49 (PARKING ASSIST UNIT (ULTRASONIC)) DETECTION CONDITION AND POSSIBLE CAUSE
| System malfunction location |
Rear ultrasonic sensor (RH) power supply circuit malfunction |
| Detection condition |
- The parking assist unit (ultrasonic) detects a rear ultrasonic sensor (RH) power supply circuit malfunction for 11 s.
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| Fail-safe |
(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (US)] .) |
| Possible cause |
- Rear bumper malfunction
- Rear ultrasonic sensor (RH) connector or terminal malfunction
- Parking assist unit (ultrasonic) connector or terminal malfunction
- Short to ground in rear ultrasonic sensor (RH) power supply circuit
- Short to power supply in rear ultrasonic sensor (RH) power supply circuit
- Open circuit in rear ultrasonic sensor (RH) power supply circuit
- Rear ultrasonic sensor (RH) malfunction
- Parking assist unit (ultrasonic) malfunction
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 Courtesy of MAZDA MOTORS CORP.
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