DTC B1B40-49: Front Corner Ultrasonic Sensor (LH) Power Supply Circuit Malfunction [Parking Assist Unit (Ultrasonic)]: Outline

DTC B1B40:49 [PARKING ASSIST UNIT (ULTRASONIC)] DETECTION CONDITION AND POSSIBLE CAUSE

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