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

  • Blind spot monitor sensor LH

  • Power source circuit of blind spot monitor sensor LH

  • Blind spot monitor sensor LH ground circuit

  • Blind spot monitor sensor RH assembly

WIRING DIAGRAM

B0070XGE21
*a from IG1-NO. 1 Relay
*b ECU-IG1 NO. 4
*c Blind Spot Monitor Sensor LH
*d Blind Spot Monitor Sensor RH

CAUTION / NOTICE / HINT

Note


  • 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

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.

PROCEDURE


  1. CHECK CAN BUS MAIN WIRE


    1. Turn the engine switch off.

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

    3. B006ZEIC01
      *1 DLC3
      *a

      Component with harness connected

      (Blind spot monitor sensor RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      W5-1 (CA2P) - W5-6 (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
      W5-1 (CA2P) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2P short to ground
      W5-6 (CA2N) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2N short to ground
      W5-1 (CA2P) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2P +B short
      W5-6 (CA2N) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2N +B short

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

      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 (BLIND SPOT MONITOR SENSOR LH) Click here

    C

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

    D

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

    A

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

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    Click here

    Result
    Proceed to
    OK
    NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK DTC


    1. Turn the engine switch off.

    2. Turn the engine switch on (IG).

    3. Check for DTCs.


      Body Electrical > Blind Spot Monitor Master > Trouble Codes
      OK
      No DTCs are output.
      Result
      Proceed to
      OK
      NG

    OK

    SYMPTOM SIMULATION Click here

    NG

    REPLACE BLIND SPOT MONITOR SENSOR LH Click here

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


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

    2. B0070EMC03
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor LH)

      Disconnect the W6 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
      W6-1 (CA2P) -W6-6 (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

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


    1. Reconnect the W6 blind spot monitor sensor LH connector.

    2. B0070EMC04
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor RH)

      Disconnect the W5 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
      W5-1 (CA2P) - W5-6 (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 - BLIND SPOT MONITOR SENSOR LH)

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


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

    2. B0070EMC03
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor LH)

      Disconnect the W6 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
      W6-1 (CA2P) -W6-6 (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

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


    1. Reconnect the W6 blind spot monitor sensor LH connector.

    2. B0070EMC04
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor RH)

      Disconnect the W5 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
      W5-1 (CA2P) - W5-6 (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 - BLIND SPOT MONITOR SENSOR LH)

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


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

    2. Disconnect the W6 blind spot monitor sensor LH connector.

    3. B006YFPC25
      *1 DLC3
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W6-1 (CA2P) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      W6-6 (CA2N) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      W6-1 (CA2P) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      W6-6 (CA2N) - K68-16 (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

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


    1. Disconnect the W5 blind spot monitor sensor RH connector.

    2. B006YFPC26
      *1 DLC3
      *a

      Front view of wire harness connector

      (to blind spot monitor sensor RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      W5-1 (CA2P) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      W5-6 (CA2N) - K68-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      W5-1 (CA2P) - K68-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      W5-6 (CA2N) - K68-16 (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 - BLIND SPOT MONITOR SENSOR LH)