Last Modified: 07-31-2024 6.11:8.1.0 Doc ID: RM100000001D0NF
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 11/2022]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model (w/o Safe Exit Assist Function)): U0233; Lost Communication with Blind Spot Monitor Master Module; 2019 - 2023 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 11/2022]

DTC

U0233

Lost Communication with Blind Spot Monitor Master Module

DESCRIPTION

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

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

U0233

Lost Communication with Blind Spot Monitor Master Module

The blind spot monitor sensor (slave) cannot receive signals from the blind spot monitor sensor (master)
  • Blind spot monitor sensor LH
  • Blind spot monitor sensor RH
  • Wire 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 engine 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) Turn the engine switch off.

(b) Turn the engine switch on (IG).

(c) Clear the DTCs.

Body Electrical > Blind Spot Monitor Slave > Clear DTCs

(d) Check for DTCs.

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

Result

Proceed to

DTC U0233 is output

A

No DTCs are output

B
B

USE SIMULATION METHOD TO CHECK

A

2.

REPLACE BLIND SPOT MONITOR SENSOR LH

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NEXT

3.

CHECK DTC OUTPUT

(a) Check for DTCs.

Body Electrical > Blind Spot Monitor Slave > Trouble Codes

Result

Proceed to

DTC U0233 is output

A

No DTCs are output

B
A

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B

END (BLIND SPOT MONITOR SENSOR LH WAS DEFECTIVE)