DTC B1B40-49: Front Corner Ultrasonic Sensor (LH) Signal Circuit Malfunction [Vehicle Control Module]: Outline

DTC B1B40:49 [VEHICLE CONTROL MODULE] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Front corner ultrasonic sensor (LH) signal circuit malfunction
Detection condition	The vehicle control module (VCM) detects that the parking assist unit (ultrasonic) determined that there is a malfunction in the front corner ultrasonic sensor (LH) signal circuit for 11 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (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) signal circuit Short to power supply in front corner ultrasonic sensor (LH) signal circuit Open circuit in front corner ultrasonic sensor (LH) signal circuit Front corner ultrasonic sensor (LH) malfunction Parking assist unit (ultrasonic) malfunction
Courtesy of MAZDA MOTORS CORP.