Toyota Corolla Cross Owners & Service Manuals

Toyota Corolla Cross: Lost Communication with Side Obstacle Detection Control Module "B" Missing Message (U023387)

Toyota Corolla Cross (2022-2025) Service Manual / Audio & Visual & Telematics / Park Assist / Monitoring / Blind Spot Monitor System / Lost Communication with Side Obstacle Detection Control Module "B" Missing Message (U023387)

DESCRIPTION

This DTC is stored when the blind spot monitor sensor RH (A) judges that there is a communication problem with the blind spot monitor sensor LH (B).

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U023387

Lost Communication with Side Obstacle Detection Control Module "B" Missing Message

The blind spot monitor sensor RH (A) cannot receive signals from the blind spot monitor sensor LH (B)
  • Blind spot monitor sensor LH (B)
  • Blind spot monitor sensor RH (A)
  • Harness or connector

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.

HINT:

  • Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE

1.

CHECK DTC OUTPUT

(a) Reconnect the cable to the negative (-) auxiliary battery terminal.

(b) Turn the ignition switch off.

(c) Turn the ignition switch to ON.

(d) Check for DTCs.

Body Electrical > Blind Spot Monitor "A" > Trouble Codes

Result

Proceed to

U023387 is output

A

DTCs are not output

B

None of the above conditions are met

C
B

USE SIMULATION METHOD TO CHECK

C

GO TO DTC CHART
A

2.

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

HINT:

Click here

NEXT

3.

CLEAR DTC

(a) Clear the DTCs.

Body Electrical > Blind Spot Monitor "A" > Clear DTCs
NEXT

4.

CHECK DTC OUTPUT

(a) Check for DTCs.

Body Electrical > Blind Spot Monitor "A" > Trouble Codes

Result

Proceed to

U023387 is output

A

DTCs are not output

B

None of the above conditions are met

C
A

REPLACE BLIND SPOT MONITOR SENSOR RH (A)

B

END (BLIND SPOT MONITOR SENSOR LH (B) WAS DEFECTIVE)
C

GO TO DTC CHART

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