General Information

Front Back Warning System
B1214 Rear Left Sensor Fault - General Information

Component Location





General Description

FBWS is a parking assistant system. It has a supersonic sensor which radiates supersonic to front and rear side of the vehicle to detect supersonic reflected from an obstacle. It calculates distances between vehicle and obstacle if it detects reflected supersonic. It warns being obstacle to drivers through buzzer or displaying on cluster according to distance from obstacle. Warning level is divided into 3 step. (warning level rises progressively according to distance from obstacle)






DTC Description

This code reports an error in RX line. The purpose is to verify the status of FBWS UNIT, Sensor and Wire when error is detected.

DTC Detecting Condition





Diagnostic Circuit Diagram










Signal Waveform & Data




Fig.1) Normal waveform of front left sensor' TX and RX line under scrubbing it with hand condition.