DTC B1B57-49: Malfunction In Power Supply To Ultrasonic Sensor [Vehicle Control Module]: Outline

DTC B1B57:49 [VEHICLE CONTROL MODULE] DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Malfunction in power supply to ultrasonic sensor
Detection condition	NOTE: DTC B1B57:49 is detected even if rear ultrasonic sensor-related malfunction occurred. The vehicle control module (VCM) detects that the parking assist unit (ultrasonic) determined that there is a malfunction in power supply to the ultrasonic sensor for 10 s.
Fail-safe	(See DTC TABLE [VEHICLE CONTROL MODULE (US)] .)
Possible cause	Parking assist unit (ultrasonic) connector or terminal malfunction Front bumper malfunction Front ultrasonic sensor connector or terminal malfunction Short to ground in front ultrasonic sensor power supply circuit Open circuit in front ultrasonic sensor power supply circuit Front ultrasonic sensor malfunction Parking assist unit (ultrasonic) malfunction Vehicle control module (VCM) malfunction (built into body control module (BCM))
Courtesy of MAZDA MOTORS CORP.