Code No. B253A RR Corner sensor open and short
Code No. B253B RL Corner sensor open and short
Code No. B253C RR Back sensor open and short
Code No. B253D RL Back sensor open and short

caution

Before replacing the ECU or sensor, ensure that the power supply circuit, the earth circuit and the communication circuit are normal.
When the illuminated licence plate is installed, the sensors may not operate because of noise from the plate. (When the ultrasonic noise is received, the bass toned buzzer sound continuously. When the ultrasonic noise stops, the normal operation will be resumed immediately.)

During the transmission/reception operation of each sensor, when the corner sensor/back sensor-ECU detects an open circuit abnormality or short circuit between the sensor and corner sensor/back sensor-ECU, or when there is an error with the corner sensor/back sensor-ECU internal monitor, the ECU sets one of the diagnosis codes No. B253A, No. B253B, No. B253C, and No. B253D.

DIAGNOSIS PROCEDURE

Check of open circuit, short to power supply, short to earth circuit in SRR, SGN4 line between rear corner sensor (RH) connector and corner sensor/back sensor-ECU.
Check of open circuit, short to power supply, short to earth circuit in SRL, SGN3 line between rear corner sensor (LH) connector and corner sensor/back sensor-ECU.
Check of open circuit, short to power supply, short to earth circuit in SBRH, SGN1 line between back sensor (RH) connector and corner sensor/back sensor-ECU.
Check of open circuit, short to power supply, short to earth circuit in SBLH, SGN2 line between back sensor (LH) connector and corner sensor/back sensor-ECU.