Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000001983P
Model Year Start: 2018 Model: Sienna Prod Date Range: [11/2017 -           ]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: U0232; Lost Communication with Blind Spot Monitor Slave Module; 2018 - 2020 MY Sienna [11/2017 -        ]

DTC

U0232

Lost Communication with Blind Spot Monitor Slave 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.

DTC Detection Condition

Trouble Area

U0232

The blind spot monitor sensor RH cannot receive signals from the blind spot monitor sensor LH.
  • Open or short in CAN bus main wire or connector
  • Blind spot monitor sensor LH
  • Blind spot monitor sensor RH

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • When checking for DTCs, make sure that the blind spot monitor system is 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 (-) 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 (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here 2017 - 2020 MY Sienna [08/2016 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

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 CAN BUS MAIN WIRE

(a) Turn the ignition switch off.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

Result

q3-1 (CA2P) - q3-6 (CA2N)

Cable disconnected from negative (-) battery terminal

54 to 69 Ω

Below 54 Ω: Short circuit between bus lines

70 Ω or more: Open circuit in main bus lines

q3-1 (CA2P) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω: CA2P short to ground

q3-6 (CA2N) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω: CA2N short to ground

q3-1 (CA2P) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ: CA2P +B short

q3-6 (CA2N) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ: CA2N +B short

*1

DLC3

*a

Component with harness connected

(Blind spot monitor sensor LH)

(d) Reconnect the cable to the negative (-) battery terminal.

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
B

GO TO STEP 5

C

GO TO STEP 7

D

GO TO STEP 9

A

2.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q2-10 (BRGD) - Body ground

Always

Below 1 Ω

*a

Front view of wire harness connector

(to Blind Spot Monitor Sensor RH)
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

Switch Condition

Specified Condition

q2-5 (BRB) - Body ground

Ignition switch ON

11 to 14 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK DTC

(a) Turn the ignition switch to off.

(b) Turn the ignition switch to ON.

(c) Check for DTCs.

Click here 2018 - 2020 MY Sienna [11/2017 -        ]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM: DTC CHECK / CLEAR

OK:

No DTCs are output.

OK

SYMPTOM SIMULATION

NG

REPLACE BLIND SPOT MONITOR SENSOR RH

5.

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

(a) Disconnect the cable from the negative (-) battery terminal.

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

*a

Front view of wire harness connector

(to blind spot monitor sensor RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q2-1 (CA2P) - q2-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR RH

NG

6.

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

(a) Reconnect the q2 blind spot monitor sensor RH connector.

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

*a

Front view of wire harness connector

(to blind spot monitor sensor LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q3-1 (CA2P) - q3-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BLIND SPOT MONITOR SENSOR LH)

7.

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

(a) Disconnect the cable from the negative (-) battery terminal.

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

*a

Front view of wire harness connector

(to blind spot monitor sensor RH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q2-1 (CA2P) - q2-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR RH

NG

8.

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

(a) Reconnect the q2 blind spot monitor sensor RH connector.

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

*a

Front view of wire harness connector

(to blind spot monitor sensor LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q3-1 (CA2P) - q3-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω
OK

REPLACE BLIND SPOT MONITOR SENSOR LH

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - BLIND SPOT MONITOR SENSOR LH)

9.

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

(a) Disconnect the cable from the negative (-) battery terminal.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q2-1 (CA2P) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

q2-6 (CA2N) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

q2-1 (CA2P) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

q2-6 (CA2N) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

*1

DLC3

*a

Front view of wire harness connector

(to blind spot monitor sensor RH)
OK

REPLACE BLIND SPOT MONITOR SENSOR RH

NG

10.

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

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

q3-1 (CA2P) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

q3-6 (CA2N) - D16-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

q3-1 (CA2P) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

q3-6 (CA2N) - D16-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

*1

DLC3

*a

Front view of wire harness connector

(to blind spot monitor sensor LH)
OK

REPLACE BLIND SPOT MONITOR SENSOR LH