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Home >> Lexus >> 2022 >> LS 500h RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/ Advanced Park) - Diagnostic Codes (5 Of 6) >> AIRBAG SYSTEM (w/ Advanced Park) >> DTC B0090-87: Left Frontal Restraints Sensor Missing Message [11/2021 - 10/2023] >> Procedure

DTC B0090-87: Left Frontal Restraints Sensor Missing Message [11/2021 - 10/2023]: Procedure

  1. CHECK CONNECTION OF CONNECTORS 

    Pre-procedure1

    1. Turn the power 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 ECU assembly and front airbag sensor LH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    4. None

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTORS 

    Pre-procedure1

    1. Disconnect the airbag ECU assembly connector.
      GTY973646Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Wire Harness
    2. Disconnect the front airbag sensor LH connector.

      Procedure1

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

      OK

      The terminals of the connectors 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  3

  3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN THE CIRCUIT) 

    Pre-procedure1

    1. None
      GTY1087655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-2 (+SL) - A15-1 (-SL) Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

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

    Pre-procedure1

    1. Using a service wire, connect terminals 30 (+SL) and 31 (-SL) of connector B.
      GTY1088050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *4 Service Wire
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *b Front view of wire harness connector
      (to Airbag ECU 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
      A15-2 (+SL) - A15-1 (-SL) 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  5

  5. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT TO GROUND IN THE CIRCUIT) 

    Pre-procedure1

    1. None
      GTY1087655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)

      Procedure1

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A15-2 (+SL) - Body ground Always 1 MΩ or higher
      A15-1 (-SL) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

      Post-procedure1

    3. None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  6

  6. 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.
      GTY1087655Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)
    2. Turn the power switch on (IG).

      Procedure1

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

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A15-2 (+SL) - Body ground Power switch on (IG) Below 1 V
      A15-1 (-SL) - Body ground Power switch on (IG) Below 1 V

      Result

      Proceed to
      OK
      NG

      Pre-procedure1

    4. Turn the power 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  7

  7. CHECK FRONT AIRBAG SENSOR LH 
    1. Connect the G11 airbag ECU assembly connector.
      GTY973660Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Airbag Sensor RH
      *2 Airbag ECU Assembly
      *3 Wire Harness
    2. Interchange the front airbag sensor LH with RH and connect the connectors.
    3. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

    Result: 

    NEXT 

    See step  8

  8. CHECK FRONT AIRBAG SENSOR LH 

    Pre-procedure1

    1. Turn the power switch off.
    2. Turn the power switch on (IG), and wait for at least 60 seconds.

      Procedure1

    3. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result  Proceed to
      B0090-87 is output A
      B0095-87 is output B
      B0090-87 and B0095-87 are not output C

      Post-procedure1

    4. Turn the power switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    6. Return the front airbag sensor RH and LH to their original positions and connect the connectors.

    Result: 

    A 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    B 

    REPLACE FRONT AIRBAG SENSOR LH. Refer to  REMOVAL [11/2021 - 10/2022]  , or refer to  REMOVAL [10/2022 - 10/2023] 

    Result: 

    C 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2021 - 10/2022]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - 10/2023] 

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