PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U0232; Lost Communication with Blind Spot Monitor Slave Module; 2022 - 2025 MY RAV4 RAV4 HV [12/2021

Last Modified: 05-08-2025	6.11:8.1.0	Doc ID: RM1000000021JSN
Model Year Start: 2022	Model: RAV4	Prod Date Range: [12/2021 - ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U0232; Lost Communication with Blind Spot Monitor Slave Module; 2022 - 2025 MY RAV4 RAV4 HV [12/2021 - ]

DTC

U0232

Lost Communication with Blind Spot Monitor Slave 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 No.	Detection Item	DTC Detection Condition	Trouble Area
U0232	Lost Communication with Blind Spot Monitor Slave Module	The blind spot monitor sensor (master) cannot receive signals from the blind spot monitor sensor (slave)	Open or short in CAN bus main wire or connector Open or short in No. 100 CAN junction connector Blind spot monitor sensor LH Power source circuit of blind spot monitor sensor RH Blind spot monitor sensor RH ground circuit Blind spot monitor sensor RH

WIRING DIAGRAM

for Gasoline Model

for HV Model

CAUTION / NOTICE / HINT

NOTICE:

When checking for DTCs, make sure that the blind spot monitor system is turned on.
Inspect the fuses for circuits related to this system before performing the following procedure.
Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.
After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.
Click here

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.	CONFIRM MODEL

(a) Choose the model to be inspected.

Result	Proceed to
w/ Parking Support Brake System	A
w/o Parking Support Brake System	B

GO TO STEP 3

2.	CHECK DTC OUTPUT (PARKING SUPPORT BRAKE SYSTEM)

(a) Using the Techstream, check for DTCs according to the prompts on the screen.

for Gasoline Model

Click here

for HV Model

Click here

Body Electrical > Clearance Warning > Trouble Codes

Standard:

The clearance warning ECU assembly does not output DTCs U117787 and U117887 simultaneously.

GO TO PARKING SUPPORT BRAKE SYSTEM (DTC U117787)

for Gasoline Model

Click here

for HV Model

Click here

3.	CHECK CAN BUS MAIN WIRE

(a) Turn the ignition switch off.

(b) Disconnect the cable from the negative (-) auxiliary battery terminal.

Standard Resistance:

Tester Connection	Condition	Specified Condition	Result
M58-6 (CANH) - M58-17 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	54 to 69 Ω	Below 54 Ω: Short circuit between bus lines
M58-6 (CANH) - M58-17 (CANL)		54 to 69 Ω	70 Ω or more: Open circuit in main bus lines
M58-6 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Below 200 Ω: CANH short to ground
M58-17 (CANL) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher	Below 200 Ω: CANL short to ground
M58-6 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Below 6 kΩ: CANH +B short
M58-17 (CANL) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher	Below 6 kΩ: CANL +B short

Component with harness connected

(No. 100 CAN Junction Connector)

Front view of wire harness connector

(DLC3)

Result	Proceed to
OK	A
Open circuit in CAN main bus lines	B
Short circuit between bus lines	C
Short to ground +B short	D

GO TO STEP 9

GO TO STEP 12

GO TO STEP 15

4.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BODY GROUND)

(a) Disconnect the blind spot monitor sensor RH connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q13-10 (BRGD) - Body ground	Always	Below 1 Ω

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.	CHECK HARNESS AND CONNECTOR (BLIND SPOT MONITOR SENSOR RH POWER SOURCE)

(a) Disconnect the blind spot monitor sensor RH connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:

Tester Connection

Condition

Specified Condition

Q13-5 (BRB) - Body ground

Ignition switch ON

10.5 to 16 V*1

11 to 14 V*2

Q13-5 (BRB) - Body ground

Ignition switch off

Below 1 V

*1: w/ Stop and Start System

*2: w/o Stop and Start System

Result	Proceed to
OK	A
NG (w/o Stop and Start System)	B
NG (w/ Stop and Start System)	C

REPAIR OR REPLACE HARNESS OR CONNECTOR

GO TO STOP AND START SYSTEM

CHECK DTC

(a) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Clear DTCs

(b) Turn the ignition switch off.

(d) Check for DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

DTC U0232 is not output.

USE SIMULATION METHOD TO CHECK

7.	REPLACE BLIND SPOT MONITOR SENSOR RH

(a) Replace the blind spot monitor sensor RH.

Click here

8.	RECHECK DTC

(a) Clear the DTCs.

Click here

Body Electrical > Blind Spot Monitor Master > Clear DTCs

(b) Recheck for DTCs and check if the same DTC is output again.

Click here

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

END

REPLACE BLIND SPOT MONITOR SENSOR LH

9.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 100 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 100 CAN junction connector.

*a	Front view of wire harness connector (to No. 100 CAN Junction Connector)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M58-6 (CANH) - M58-17 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω
M58-7 (CANH) - M58-18 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

Result	Proceed to
OK	A
NG (to blind spot monitor sensor RH CAN main wire)	B
NG (to blind spot monitor sensor LH CAN main wire)	C

REPLACE NO. 100 CAN JUNCTION CONNECTOR

GO TO STEP 11

10.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH)

(a) Reconnect the M58 No. 100 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

(b) Disconnect the blind spot monitor sensor RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q13-1 (CA2P) - Q13-6 (CA2N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR RH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 100 CAN JUNCTION CONNECTOR)

11.	CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH)

(a) Reconnect the M58 No. 100 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

(b) Disconnect the blind spot monitor sensor LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q1-1 (CA2P) - Q1-6 (CA2N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR LH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 100 CAN JUNCTION CONNECTOR)

12.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 100 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 100 CAN junction connector.

*a	Front view of wire harness connector (to No. 100 CAN Junction Connector)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M58-6 (CANH) - M58-17 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω
M58-7 (CANH) - M58-18 (CANL)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

Result	Proceed to
OK	A
NG (to blind spot monitor sensor RH CAN main wire)	B
NG (to blind spot monitor sensor LH CAN main wire)	C

REPLACE NO. 100 CAN JUNCTION CONNECTOR

GO TO STEP 14

13.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH)

(a) Reconnect the M58 No. 100 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor RH)

(b) Disconnect the blind spot monitor sensor RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q13-1 (CA2P) - Q13-6 (CA2N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR RH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 100 CAN JUNCTION CONNECTOR)

14.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH)

(a) Reconnect the M58 No. 100 CAN junction connector.

*a	Front view of wire harness connector (to Blind Spot Monitor Sensor LH)

(b) Disconnect the blind spot monitor sensor LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q1-1 (CA2P) -Q1-6 (CA2N)	Cable disconnected from negative (-) auxiliary battery terminal	108 to 132 Ω

REPLACE BLIND SPOT MONITOR SENSOR LH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 100 CAN JUNCTION CONNECTOR)

15.	CHECK FOR SHORT IN CAN BUS WIRES (NO. 100 CAN JUNCTION CONNECTOR)

(a) Disconnect the No. 100 CAN junction connector.

Front view of wire harness connector

(to No. 100 CAN Junction Connector)

Front view of wire harness connector

(DLC3)

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
M58-6 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
M58-17 (CANL) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
M58-6 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
M58-17 (CANL) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
M58-7 (CANH) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
M58-18 (CANL) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
M58-7 (CANH) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
M58-18 (CANL) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

Result	Proceed to
OK	A
NG (to blind spot monitor sensor RH CAN main wire)	B
NG (to blind spot monitor sensor LH CAN main wire)	C

REPLACE NO. 100 CAN JUNCTION CONNECTOR

GO TO STEP 17

16.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH)

(a) Reconnect the M58 No. 100 CAN junction connector.

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH)

Front view of wire harness connector

(DLC3)

(b) Disconnect the blind spot monitor sensor RH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q13-1 (CA2P) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
Q13-6 (CA2N) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
Q13-1 (CA2P) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
Q13-6 (CA2N) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR RH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 100 CAN JUNCTION CONNECTOR)

17.	CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH)

(a) Reconnect the M58 No. 100 CAN junction connector.

Front view of wire harness connector

(to Blind Spot Monitor Sensor LH)

Front view of wire harness connector

(DLC3)

(b) Disconnect the blind spot monitor sensor LH connector.

Standard Resistance:

Tester Connection	Condition	Specified Condition
Q1-1 (CA2P) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
Q1-6 (CA2N) - G114-4 (CG)	Cable disconnected from negative (-) auxiliary battery terminal	200 Ω or higher
Q1-1 (CA2P) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher
Q1-6 (CA2N) - G114-16 (BAT)	Cable disconnected from negative (-) auxiliary battery terminal	6 kΩ or higher

REPLACE BLIND SPOT MONITOR SENSOR LH

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 100 CAN JUNCTION CONNECTOR)