Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Lost Communication with Blind Spot Monitor Master Module (U0233)

DESCRIPTION

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

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 RH Blind spot monitor sensor LH 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).

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

USE SIMULATION METHOD TO CHECK

2.	REPLACE BLIND SPOT MONITOR SENSOR RH

Click here

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

REPLACE BLIND SPOT MONITOR SENSOR LH

END (BLIND SPOT MONITOR SENSOR RH WAS DEFECTIVE)

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Toyota Avalon (XX50) 2019-2022 Owners Manual