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Home >> Lexus >> 2015 >> IS 250 Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Blind Spot Monitor System - Diagnostic Codes & Circuit Tests >> Blind Spot Monitor System >> DTC U0232: Lost Communication with Blind Spot Monitor Slave Module [10/2016 - 09/2020] >> Procedure

DTC U0232: Lost Communication with Blind Spot Monitor Slave Module [10/2016 - 09/2020]: Procedure

  1. CHECK CAN BUS MAIN WIRE 
    1. 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
      Q50-1 (CA2P) - Q50-6 (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
      Q50-1 (CA2P) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2P short to ground
      Q50-6 (CA2N) - Body ground Cable disconnected from negative (-) battery terminal 200 Ω or higher Below 200 Ω: CA2N short to ground
      Q50-1 (CA2P) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2P +B short
      Q50-6 (CA2N) - +B Cable disconnected from negative (-) battery terminal 6 kΩ or higher Below 6 kΩ: CA2N +B short
      GTY612457Courtesy 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: 

    B 

    See step  7

    Result: 

    C 

    See step  9

    Result: 

    D 

    See step  11

    Result: 

    A 

    See step  2

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

    Refer to Power Source Circuit [10/2016 - 09/2020] 

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

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

    Refer to Power Source Circuit [10/2016 - 09/2020] 

    Result

    Proceed to
    OK
    NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

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

      Refer to DTC CHECK / CLEAR [04/2013 - 09/2020]

      Body Electrical > Blind Spot Monitor Master > Trouble Codes 

      OK

      No DTCs are output.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    SYMPTOM SIMULATION. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2016 - 10/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 09/2020] 

    Result: 

    NG 

    See step  5

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

      Refer to REMOVAL [10/2016 - ]

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  6

  6. RECHECK DTC 
    1. Clear the DTCs.

      Refer to DTC CHECK / CLEAR [04/2013 - 09/2020]

      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: 

    OK 

    END 

    Result: 

    NG 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2016 - ] 

  7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR RH) 
    1. Reconnect the Q50 blind spot monitor sensor LH connector.
    2. Disconnect the Q51 blind spot monitor sensor RH connector.
      GTY657233Courtesy 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
      Q51-1 (CA2P) -Q51-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    NG 

    See step  8

  8. CHECK FOR OPEN IN CAN BUS MAIN WIRE (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the Q50 blind spot monitor sensor LH connector.
      GTY682351Courtesy 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
      Q50-1 (CA2P) - Q50-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    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 Q50 blind spot monitor sensor LH connector.
    2. Disconnect the Q51 blind spot monitor sensor RH connector.
      GTY657232Courtesy 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
      Q51-1 (CA2P) -Q51-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    NG 

    See step  10

  10. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the Q50 blind spot monitor sensor LH connector.
      GTY657231Courtesy 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
      Q50-1 (CA2P) - Q50-6 (CA2N) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    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 Q50 blind spot monitor sensor LH connector.
    2. Disconnect the Q51 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
      Q51-1 (CA2P) - K9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Q51-6 (CA2N) - K9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Q51-1 (CA2P) - K9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Q51-6 (CA2N) - K9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      GTY643131Courtesy 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: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR RH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    NG 

    See step  12

  12. CHECK FOR SHORT IN CAN BUS WIRES (BLIND SPOT MONITOR SENSOR LH) 
    1. Disconnect the Q50 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
      Q50-1 (CA2P) - K9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Q50-6 (CA2N) - K9-4 (CG) Cable disconnected from negative (-) battery terminal 200 Ω or higher
      Q50-1 (CA2P) - K9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      Q50-6 (CA2N) - K9-16 (BAT) Cable disconnected from negative (-) battery terminal 6 kΩ or higher
      GTY679252Courtesy 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: 

    OK 

    REPLACE BLIND SPOT MONITOR SENSOR LH. Refer to  REMOVAL [10/2016 - ] 

    Result: 

    NG 

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

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