PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U0233; Lost Communication with Blind Spot Monitor Master Module; 2018 - 2020 MY Sienna [11/2017

Last Modified: 04-05-2023	6.11:8.1.0	Doc ID: RM1000000019H2X
Model Year Start: 2018	Model: Sienna	Prod Date Range: [11/2017 - ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U0233; Lost Communication with Blind Spot Monitor Master Module; 2018 - 2020 MY Sienna [11/2017 - ]

DTC

U0233

Lost Communication with Blind Spot Monitor Master Module

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 Code	DTC Detection Condition	Trouble Area
U0233	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

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.

1.	CHECK DTC OUTPUT

(a) Clear the DTCs.

Click here

(b) Check for DTCs.

Click here

Result	Proceed to
DTC U0233 is output	A
No DTC is output	B

2.	REPLACE BLIND SPOT MONITOR SENSOR LH

(a) Replace the blind spot monitor sensor LH.

Click here

3.	CHECK DTC OUTPUT

(a) Check for DTCs.

Click here

Result	Proceed to
DTC U0233 is output	A
No DTC is output	B

END (BLIND SPOT MONITOR SENSOR LH WAS DEFECTIVE)