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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (3 Of 7) >> Airbag System >> DTC B0052-00: Passenger Seat Belt Sensor Circuit Undetermined Failure [11/2023 - ] >> Procedure

DTC B0052-00: Passenger Seat Belt Sensor Circuit Undetermined Failure [11/2023 - ]: Procedure

  1. CHECK VEHICLE CONDITION 
    1. Choose the model to be inspected.

      Result

      Result Proceed to
      for Manual Seat A
      for Power Seat B

    Result: 

    B 

    See step  10

    Result: 

    A 

    See step  2

  2. CHECK CONNECTION OF CONNECTORS 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

      Procedure1

    3. Check that the connectors are properly connected to the airbag sensor assembly and front seat inner belt assembly RH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTORS 

    Pre-procedure1

    1. Disconnect the airbag sensor assembly connector.
      GTY984871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
    2. Disconnect the front seat inner belt assembly RH connector.

      Procedure1

    3. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH 

    Pre-procedure1

    1. Remove the front seat inner belt assembly RH.

      Refer to REMOVAL [11/2023 - ]

      Procedure1

    2. Inspect the front seat inner belt assembly RH.
      GTY1118130Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH *2 Auxiliary Battery
      *a Component without harness connected
      (Front Seat Inner Belt Assembly RH)      		 *b Tester

      Standard Current

      Tester Connection Condition Specified Condition
      Tester positive (+) - 2
      Tester negative (-) - Auxiliary battery negative (-)      		 Seat belt fastened 12.0 to 18.0 mA
      Seat belt not fastened 4.0 to 7.0 mA

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  5

  5. CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN IN THE CIRCUIT) 

    Pre-procedure1

    1. Using a service wire, connect terminals 27 (RBE+) and 18 (GNDR) of connector B.
      GTY1178129Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *4 Service Wire
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)
      *b Front view of wire harness connector
      (to Airbag Sensor Assembly)
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      e4-1 (+) - e4-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. Disconnect the service wire from connector B.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO GROUND IN THE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e4-1 (+) - Body ground Always 1 MΩ or higher
      e4-2 (-) - Body ground Always 1 MΩ or higher
      GTY1178142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  7

  7. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO +B IN THE CIRCUIT) 

    Pre-procedure1

    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    2. Turn the ignition switch to ON.

      Procedure1

    3. Measure the voltage according to the value(s) in the table below.
      GTY1178142Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      e4-1 (+) - Body ground Ignition switch ON Below 1 V
      e4-2 (-) - Body ground Ignition switch ON Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CLEAR DTC 

    Pre-procedure1

    1. Connect the airbag sensor assembly connector.
      GTY972567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
    2. Connect the front seat inner belt assembly RH connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

      Procedure1

    5. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

      Post-procedure1

    6. Turn the ignition switch off.

    Result: 

    NEXT 

    See step  9

  9. CHECK DTC 

    Pre-procedure1

    1. Turn the ignition switch to ON, and wait for at least 60 seconds.

      Procedure1

    2. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      B0052-00 is output A
      B0052-00 is not output B

      HINT: 

      Codes other than DTC B0052-00 may be output at this time, but they are not related to this check.

      Post-procedure1

    3. None

    Result: 

    A 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

  10. CHECK CONNECTION OF CONNECTORS 

    Pre-procedure1

    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

      Procedure1

    3. Check that the connectors are properly connected to the airbag sensor assembly and front seat inner belt assembly RH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  11

  11. CHECK CONNECTORS 

    Pre-procedure1

    1. Disconnect the airbag sensor assembly connector.
      GTY984871Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
    2. Disconnect the front seat inner belt assembly RH connector.

      Procedure1

    3. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  12

  12. INSPECT FRONT SEAT INNER BELT ASSEMBLY RH 

    Pre-procedure1

    1. Remove the front seat inner belt assembly RH.

      Refer to REMOVAL [11/2023 - ]

      Procedure1

    2. Inspect the front seat inner belt assembly RH.
      GTY1054362Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH *2 Auxiliary Battery
      *a Component without harness connected
      (Front Seat Inner Belt Assembly RH)      		 *b Tester

      Standard Current

      Tester Connection Condition Specified Condition
      Tester positive (+) - 2
      Tester negative (-) - Auxiliary battery negative (-)      		 Seat belt fastened 12.0 to 18.0 mA
      Seat belt not fastened 4.0 to 7.0 mA

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    OK 

    See step  13

  13. CHECK HARNESS AND CONNECTOR (CHECK FOR OPEN IN THE CIRCUIT) 

    Pre-procedure1

    1. Using a service wire, connect terminals 27 (RBE+) and 18 (GNDR) of connector B.
      GTY1178289Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *4 Service Wire
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)
      *b Front view of wire harness connector
      (to Airbag Sensor Assembly)
      NOTE:

      Do not forcibly insert the service wire into the terminals of the connector when connecting a service wire.

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      e28-1 (+) - e28-2 (-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. Disconnect the service wire from connector B.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  14

  14. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO GROUND IN THE CIRCUIT) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      e28-1 (+) - Body ground Always 1 MΩ or higher
      e28-2 (-) - Body ground Always 1 MΩ or higher
      GTY1178244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  15

  15. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO +B IN THE CIRCUIT) 

    Pre-procedure1

    1. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    2. Turn the ignition switch to ON.

      Procedure1

    3. Measure the voltage according to the value(s) in the table below.
      GTY1178244Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly RH)

      Standard Voltage

      Tester Connection Condition Specified Condition
      e28-1 (+) - Body ground Ignition switch ON Below 1 V
      e28-2 (-) - Body ground Ignition switch ON Below 1 V

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  16

  16. CLEAR DTC 

    Pre-procedure1

    1. Connect the airbag sensor assembly connector.
      GTY972567Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly RH
      *2 Airbag Sensor Assembly
      *3 Wire Harness
    2. Connect the front seat inner belt assembly RH connector.
    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    4. Turn the ignition switch to ON, and wait for at least 60 seconds.

      Procedure1

    5. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

      Post-procedure1

    6. Turn the ignition switch off.

    Result: 

    NEXT 

    See step  17

  17. CHECK DTC 

    Pre-procedure1

    1. Turn the ignition switch to ON, and wait for at least 60 seconds.

      Procedure1

    2. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      B0052-00 is output A
      B0052-00 is not output B

      HINT: 

      Codes other than DTC B0052-00 may be output at this time, but they are not related to this check.

      Post-procedure1

    3. None

    Result: 

    A 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [11/2023 - ] 

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ] 

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