DTC B1B50-04: Rear Ultrasonic Sensor (LH) Signal Circuit Malfunction [Parking Assist Unit (Ultrasonic)]: Outline

DTC B1B50:04 [PARKING ASSIST UNIT (ULTRASONIC)] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Rear ultrasonic sensor (LH) signal circuit malfunction
Detection condition	The parking assist unit (ultrasonic) detects a rear ultrasonic sensor (LH) signal circuit malfunction for 11 s.
Fail-safe	(See DTC TABLE [PARKING ASSIST UNIT (ULTRASONIC) (US)] .)
Possible cause	Rear bumper malfunction Rear ultrasonic sensor (LH) connector or terminal malfunction Parking assist unit (ultrasonic) connector or terminal malfunction Short to ground in rear ultrasonic sensor (LH) signal circuit Short to power supply in rear ultrasonic sensor (LH) signal circuit Open circuit in rear ultrasonic sensor (LH) signal circuit Rear ultrasonic sensor (LH) malfunction Parking assist unit (ultrasonic) malfunction
Courtesy of MAZDA MOTORS CORP.