DTC B1B40-49: Front Corner Ultrasonic Sensor (LH) Signal Circuit Malfunction [Vehicle Control Module]: Outline
WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.
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.
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