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Home >> Toyota >> 2019 >> Highlander Limited, FWD >> Repair and Diagnosis >> Accessories & Equipment >> Collision/Avoidance >> Blind Spot Monitor System - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> Blind Spot Monitor System >> DTC U0232: Lost Communication with Blind Spot Monitor Slave Module [11/2016 - ] >> Procedure

DTC U0232: Lost Communication with Blind Spot Monitor Slave Module [11/2016 - ]: Procedure

  1. CHECK CAN BUS MAIN WIRE 
    1. Turn the ignition 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
      M31-1 (CA2P) - M31-6 (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
      M31-1 (CA2P) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2P short to ground
      M31-6 (CA2N) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2N short to ground
      M31-1 (CA2P) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2P +B short
      M31-6 (CA2N) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2N +B short
      GTY730893Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component with harness connected
      (Blind spot monitor sensor LH)

      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

    Result:  5

    B 

    See step  7

    Result:  2

    C 

    See step  9

    Result:  3

    D 

    See step  11

    Result:  1

    A 

    See step  2

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

    See step  4

    Result

    Proceed to
    OK
    NG

    Result:  2

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  1

    OK 

    See step  3

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

    See step  4

    Result

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

    Result:  2

    B 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result:  3

    C 

    GO TO STOP AND START SYSTEM. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  1

    A 

    See step  4

  4. CHECK DTC 
    1. Reconnect the cable to the negative (-) battery terminal.
    2. Turn the ignition switch off
    3. Turn the ignition switch to ON.
    4. Check for DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Blind Spot Monitor Master > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    NG 

    See step  5

  5. REPLACE BLIND SPOT MONITOR SENSOR RH 
    1. Replace the blind spot monitor sensor RH.

      Refer to REMOVAL [11/2016 - ]

      Result

      Proceed to
      NEXT

    Result:  1

    NEXT 

    See step  6

  6. RECHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [11/2016 - ]

      Body Electrical > Blind Spot Monitor Master > Clear DTCs 

    2. 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.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    END 

    Result:  2

    NG 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [11/2016 - ] 

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH) 
    1. Reconnect the M31 blind spot monitor sensor LH connector.
    2. Disconnect the L23 blind spot monitor sensor RH connector.
      GTY692075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to blind spot monitor sensor RH)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L23-1 (CA2P) -L23-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

    See step  8

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the M31 blind spot monitor sensor LH connector.
      GTY692065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to blind spot monitor sensor LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M31-1 (CA2P) - M31-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

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

  9. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH) 
    1. Reconnect the M31 blind spot monitor sensor LH connector.
    2. Disconnect the L23 blind spot monitor sensor RH connector.
      GTY692075Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to blind spot monitor sensor RH)
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      L23-1 (CA2P) -L23-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

    See step  10

  10. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the M31 blind spot monitor sensor LH connector.
      GTY692065Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to blind spot monitor sensor LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M31-1 (CA2P) - M31-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

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

  11. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR RH) 
    1. Reconnect the M31 blind spot monitor sensor LH connector.
    2. Disconnect the L23 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
      L23-1 (CA2P) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L23-6 (CA2N) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      L23-1 (CA2P) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      L23-6 (CA2N) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      GTY709727Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Front view of wire harness connector
      (to blind spot monitor sensor RH)

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

    See step  12

  12. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the M31 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
      M31-1 (CA2P) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      M31-6 (CA2N) - F25-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      M31-1 (CA2P) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      M31-6 (CA2N) - F25-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      GTY709729Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 DLC3
      *a Front view of wire harness connector
      (to blind spot monitor sensor LH)

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [11/2016 - ] 

    Result:  3

    NG 

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

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