BLIND SPOT MONITOR SYSTEM, Diagnostic DTC:U0232

DTC Code DTC Name
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. 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. 20 CAN junction connector

  • Blind spot monitor sensor RH

  • Power source circuit of blind spot monitor sensor LH

  • Blind spot monitor sensor LH ground circuit

  • Blind spot monitor sensor LH

WIRING DIAGRAM

B006D97E01

CAUTION / NOTICE / HINT

Note


  • When checking for DTCs, make sure that the blind spot monitor system is turned on.

  • 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

Tech Tips


  • 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.

  • w/o Stop and Start System:

    Inspect the fuses for circuits related to this system before performing the following procedure.

  • w/ Stop and Start System:

    The blind spot monitor system troubleshooting procedure is based on the premise that the stop and start system normally. Check the stop and start system first before troubleshooting the blind spot monitor system

    for 8GR-FKS:

    Click here

    for V35A-FTS:

    Click here

PROCEDURE


  1. CONFIRM MODEL


    1. Choose the model to be inspected.

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

    B

    GO TO STEP 3 Click here

    A

  2. CHECK DTC (PARKING SUPPORT BRAKE SYSTEM)


    1. Using the GTS, check for DTCs according to the prompts on the screen.

      Click here


      Body Electrical > IPA/ICS/Clearance Sonar > Trouble Codes
      Standard
      The clearance warning ECU assembly does not output DTCs U0232 and U0233 simultaneously.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO PARKING SUPPORT BRAKE SYSTEM (DTC U0232) Click here

    OK

  3. CHECK CAN BUS MAIN WIRE


    1. B006GYZC08
      *1 DLC3
      *a

      Component with harness connected

      (No. 20 CAN Junction Connector)

      Turn the engine switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      L124-3 (CANH) - L124-14 (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
      L124-3 (CANH) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANH short to ground
      L124-14 (CANL) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CANL short to ground
      L124-3 (CANH) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      L124-14 (CANL) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Result
      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

    CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 20 CAN JUNCTION CONNECTOR) Click here

    C

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 20 CAN JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN CAN BUS WIRES (NO. 20 CAN JUNCTION CONNECTOR) Click here

    A

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


    1. Disconnect the L57 blind spot monitor sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L57-10 (BLGD) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the L57 blind spot monitor sensor LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L57-5 (BLB) - Body ground Engine switch on (IG)

      10.5 to 16 V*1

      11 to 14 V*2
      L57-5 (BLB) - Body ground Engine switch off Below 1 V

      • *1: w/ Stop and Start System

      • *2: w/o Stop and Start System

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Blind Spot Monitor Master > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check for DTCs.

      Click here


      Body Electrical > Blind Spot Monitor Master > Trouble Codes
      OK
      DTC U0232 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

  7. REPLACE BLIND SPOT MONITOR SENSOR LH


    1. Replace the blind spot monitor sensor LH.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  8. CHECK DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Blind Spot Monitor Master > Clear DTCs

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Recheck for DTCs and check if the same DTC is output again.

      Click here


      Body Electrical > Blind Spot Monitor Master > Trouble Codes
      OK
      DTC U0232 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END (BLIND SPOT MONITOR SENSOR LH WAS DEFECTIVE)

    NG

    REPLACE BLIND SPOT MONITOR SENSOR RH Click here

  9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 20 CAN JUNCTION CONNECTOR)


    1. Disconnect the L124 No. 20 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L124-2 (CANH) - L124-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      L124-3 (CANH) - L124-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      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. 20 CAN JUNCTION CONNECTOR

    C

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

    B

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L57 blind spot monitor sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L57-1 (CA2P) - L57-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 20 CAN JUNCTION CONNECTOR)

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L56 blind spot monitor sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L56-1 (CA2P) -L56-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR RH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 20 CAN JUNCTION CONNECTOR)

  12. CHECK FOR SHORT IN CAN BUS WIRES (NO. 20 CAN JUNCTION CONNECTOR)


    1. Disconnect the L124 No. 20 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L124-2 (CANH) - L124-13 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      L124-3 (CANH) - L124-14(CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      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. 20 CAN JUNCTION CONNECTOR

    C

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

    B

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L57 blind spot monitor sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L57-1 (CA2P) - L57-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 20 CAN JUNCTION CONNECTOR)

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L56 blind spot monitor sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L56-1 (CA2P) -L56-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR RH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 20 CAN JUNCTION CONNECTOR)

  15. CHECK FOR SHORT IN CAN BUS WIRES (NO. 20 CAN JUNCTION CONNECTOR)


    1. Disconnect the L124 No. 20 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L124-2 (CANH) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L124-13 (CANL) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L124-2 (CANH) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L124-13 (CANL) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L124-3 (CANH) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L124-14 (CANL) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L124-3 (CANH) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L124-14 (CANL) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Result
      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. 20 CAN JUNCTION CONNECTOR

    C

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

    B

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L57 blind spot monitor sensor LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L57-1 (CA2P) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L57-6 (CA2N) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L57-1 (CA2P) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L57-6 (CA2N) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR LH - NO. 20 CAN JUNCTION CONNECTOR)

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


    1. Reconnect the L124 No. 20 CAN junction connector.

    2. Disconnect the L56 blind spot monitor sensor RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L56-1 (CA2P) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L56-6 (CA2N) - G20-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L56-1 (CA2P) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L56-6 (CA2N) - G20-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE BLIND SPOT MONITOR SENSOR RH Click here

    NG

    REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (BLIND SPOT MONITOR SENSOR RH - NO. 20 CAN JUNCTION CONNECTOR)