Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM1000000026ZEF
Model Year Start: 2023 Model: GR Corolla Prod Date Range: [09/2022 -           ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (w/ Safe Exit Assist Function): U023387; Lost Communication with Side Obstacle Detection Control Module "B" Missing Message; 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]

DTC

U023387

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

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

DTC Output from

Priority

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)

Blind Spot Monitor "A"

A

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) Check for DTCs.

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

Result

Proceed to

U023387 is output

A

DTCs are not output

B
B

USE SIMULATION METHOD TO CHECK

A

2.

REPLACE BLIND SPOT MONITOR SENSOR LH (B)

HINT:

Click here 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SENSOR: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SENSOR: REMOVAL

NEXT

3.

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
A

REPLACE BLIND SPOT MONITOR SENSOR RH (A) 2023 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 - 11/2022]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SENSOR: REMOVAL 2023 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SENSOR: REMOVAL

B

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