DTC B1B48-04: Rear Corner Ultrasonic Sensor (LH) Signal Circuit Malfunction [Parking Assist Unit (Ultrasonic)]: Outline

DTC B1B48:04 [PARKING ASSIST UNIT (ULTRASONIC)] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Rear corner ultrasonic sensor (LH) signal circuit malfunction
Detection condition	The parking assist unit (ultrasonic) detects a rear corner 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 corner ultrasonic sensor (LH) connector or terminal malfunction Parking assist unit (ultrasonic) connector or terminal malfunction Short to ground in rear corner ultrasonic sensor (LH) signal circuit Short to power supply in rear corner ultrasonic sensor (LH) signal circuit Open circuit in rear corner ultrasonic sensor (LH) signal circuit Rear corner ultrasonic sensor (LH) malfunction Parking assist unit (ultrasonic) malfunction
Courtesy of MAZDA MOTORS CORP.