DTC B1B58-49: Malfunction In Power Supply To Ultrasonic Sensor (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 B1B58:49 (PARKING ASSIST UNIT (ULTRASONIC)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Malfunction in power supply to ultrasonic sensor
Detection condition	NOTE: DTC B1B58:49 is detected even if front ultrasonic sensor-related malfunction occurred. The parking assist unit (ultrasonic) detects that there is a malfunction in power supply to the ultrasonic sensor for 10 s.
Fail-safe	(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (US)] .)
Possible cause	Rear bumper malfunction Parking assist unit (ultrasonic) connector or terminal malfunction Rear ultrasonic sensor connector or terminal malfunction Short to ground in rear ultrasonic sensor power supply circuit Open circuit in rear ultrasonic sensor power supply circuit Rear ultrasonic sensor malfunction Parking assist unit (ultrasonic) malfunction
Courtesy of MAZDA MOTORS CORP.