Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001D0NS
Model Year Start: 2019 Model: GR Corolla Prod Date Range: [06/2018 - 01/2019]
Title: PARK ASSIST / MONITORING: BLIND SPOT MONITOR SYSTEM (for Gasoline Model (w/o Safe Exit Assist Function)): U0232; Lost Communication with Blind Spot Monitor Slave Module; 2019 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 01/2019]

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. 19 junction connector
  • Blind spot monitor sensor RH
  • Power source circuit of blind spot monitor sensor RH
  • Blind spot monitor sensor RH ground circuit
  • Blind spot monitor sensor LH
  • Wire harness or connector

WIRING DIAGRAM

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 engine 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 engine 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 2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: REPAIR INSTRUCTION: PRECAUTION

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 CAN BUS MAIN WIRE

(a) Turn the engine 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

O96-2 (CANH) -O96-13 (CANL)

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

O96-2 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω: CANH short to ground

O96-13 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

Below 200 Ω: CANL short to ground

O96-2 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ: CANH +B short

O96-13 (CANL) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Below 6 kΩ: CANL +B short

*1

DLC3

*a

Component with harness connected

(No. 19 Junction Connector)

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 7

C

GO TO STEP 10

D

GO TO STEP 13

A

2.

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

(a) Disconnect the O58 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

O58-10 (BRGD) - Body ground

Always

Below 1 Ω

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

3.

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

(a) Disconnect the O58 blind spot monitor sensor RH connector.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

O58-5 (BRB) - Body ground

Engine switch on (IG)

11 to 14 V

O58-5 (BRB) - Body ground

Engine switch off

Below 1 V

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.

CHECK DTC

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

(b) Turn the engine switch off.

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

(d) Check for DTCs.

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

OK

USE SIMULATION METHOD TO CHECK

NG

5.

REPLACE BLIND SPOT MONITOR SENSOR RH

(a) Replace the blind spot monitor sensor RH with a new one.

Click here 2019 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 - 01/2019]; PARK ASSIST / MONITORING: BLIND SPOT MONITOR SENSOR: REMOVAL

NEXT

6.

RECHECK DTC

(a) Clear the DTCs.

Body Electrical > Blind Spot Monitor Master > Clear DTCs

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

Body Electrical > Blind Spot Monitor Master > Trouble Codes

OK:

No DTCs are output.

OK

END

NG

REPLACE BLIND SPOT MONITOR SENSOR LH

7.

CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 19 JUNCTION CONNECTOR)

(a) Disconnect the O96 No. 19 junction connector.

*a

Front view of wire harness connector

(to No. 19 Junction Connector)

*b

to Blind Spot Monitor Sensor LH CAN main wire

*c

to Blind Spot Monitor Sensor RH CAN main wire

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O96-2 (CANH) - O96-13 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

O96-1 (CANH) - O96-12 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Result

Proceed to

OK

A

NG (to blind spot monitor sensor LH CAN main wire)

B

NG (to blind spot monitor sensor RH CAN main wire)

C

A

REPLACE NO. 19 JUNCTION CONNECTOR

C

GO TO STEP 9

B

8.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O57 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

O57-1 (CA2P) - O57-6 (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 LH - NO. 19 CAN JUNCTION CONNECTOR)

9.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O58 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

O58-1 (CA2P) -O58-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR RH

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 19 JUNCTION CONNECTOR)

10.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 19 JUNCTION CONNECTOR)

(a) Disconnect the O96 No. 19 junction connector.

*a

Front view of wire harness connector

(to No. 19 Junction Connector)

*b

to Blind Spot Monitor Sensor LH CAN main wire

*c

to Blind Spot Monitor Sensor RH CAN main wire

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O96-2 (CANH) - O96-13 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

O96-1 (CANH) - O96-12 (CANL)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

Result

Proceed to

OK

A

NG (to blind spot monitor sensor LH CAN main wire)

B

NG (to blind spot monitor sensor RH CAN main wire)

C

A

REPLACE NO. 19 JUNCTION CONNECTOR

C

GO TO STEP 12

B

11.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O57 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

O57-1 (CA2P) - O57-6 (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 LH - NO. 19 JUNCTION CONNECTOR)

12.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O58 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

O58-1 (CA2P) -O58-6 (CA2N)

Cable disconnected from negative (-) battery terminal

108 to 132 Ω

OK

REPLACE BLIND SPOT MONITOR SENSOR RH

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 19 JUNCTION CONNECTOR)

13.

CHECK FOR SHORT IN CAN BUS WIRES (NO. 19 JUNCTION CONNECTOR)

(a) Disconnect the O96 No. 19 junction connector.

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

*1

DLC3

-

-

*a

Front view of wire harness connector

(to No. 19 Junction Connector)

*b

to Blind Spot Monitor Sensor LH CAN main wire

*c

to Blind Spot Monitor Sensor RH CAN main wire

-

-

Standard Resistance:

Tester Connection

Condition

Specified Condition

O96-2 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O96-13 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O96-2 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

O96-13 (CANL) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

O96-1 (CANH) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O96-12 (CANL) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O96-1 (CANH) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

O96-12 (CANL) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

Result

Proceed to

OK

A

NG (to blind spot monitor sensor LH CAN main wire)

B

NG (to blind spot monitor sensor RH CAN main wire)

C

A

REPLACE NO. 19 JUNCTION CONNECTOR

C

GO TO STEP 15

B

14.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O57 blind spot monitor sensor LH connector.

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

O57-1 (CA2P) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O57-6 (CA2N) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O57-1 (CA2P) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

O57-6 (CA2N) - I26-16 (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

NG

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 19 JUNCTION CONNECTOR)

15.

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

(a) Reconnect the O96 No. 19 junction connector.

(b) Disconnect the O58 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

O58-1 (CA2P) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O58-6 (CA2N) - I26-4 (CG)

Cable disconnected from negative (-) battery terminal

200 Ω or higher

O58-1 (CA2P) - I26-16 (BAT)

Cable disconnected from negative (-) battery terminal

6 kΩ or higher

O58-6 (CA2N) - I26-16 (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

REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 19 JUNCTION CONNECTOR)