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Home >> Lexus >> 2023 >> RX 500h >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (5 Of 5) & Symptom Tests >> Airbag System >> DTC B1875-13: Passenger Seat Cushion Airbag Squib Circuit Open [10/2022 - ] >> Procedure

DTC B1875-13: Passenger Seat Cushion Airbag Squib Circuit Open [10/2022 - ]: Procedure

  1. CLEAR DTC 

    Pre-procedure1

    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  2

  2. CHECK DTC 

    Pre-procedure1

    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      B1875-13 is output A
      B1875-13 is not output B

    Post-procedure1

    • None

    Result: 

    B 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    A 

    See step  3

  3. CHECK CONNECTION OF CONNECTORS 

    Pre-procedure1

    • Turn the ignition switch off.
    • Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 60 seconds.
    • Check that the connectors are properly connected to the front seat cushion airbag assembly RH and airbag ECU assembly.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • None

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  4

  4. CHECK CONNECTORS 

    Pre-procedure1

    • Disconnect the airbag ECU assembly connector.
      GTY972907Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Cushion Airbag Assembly RH
      *2 Airbag ECU Assembly
      *3 Wire Harness
    • Disconnect the front seat cushion airbag assembly RH connector.
    • 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

    • None

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. CLEAR DTC 

    Pre-procedure1

    • Connect the airbag ECU assembly connector.
      GTY1127688Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Cushion Airbag Assembly RH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *4 SST
      *a Front view of wire harness connector
      (to Front Seat Cushion Airbag Assembly RH)
    • Connect SST (resistance: 2.1 Ω) to connector C.
      WARNING:

      Never connect the tester to the front seat cushion airbag assembly RH for measurement, as this may lead to a serious injury due to airbag deployment.

      NOTE:
      • Do not forcibly insert SST into the terminals of the connector when connecting SST.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    • Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  6

  6. CHECK FRONT SEAT CUSHION AIRBAG ASSEMBLY RH 

    Pre-procedure1

    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      B1875-13 is not output A
      B1875-13 is output B

      HINT: 

      Codes other than DTC B1875-13 may be output at this time, but they are not related to this check.

    Post-procedure1

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

    Result: 

    A 

    REPLACE FRONT SEAT CUSHION AIRBAG ASSEMBLY RH. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

    Result: 

    B 

    See step  7

  7. CHECK HARNESS AND CONNECTOR 

    Pre-procedure1

    • Disconnect the airbag ECU assembly connector.
      GTY1127779Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Cushion Airbag Assembly RH
      *2 Airbag ECU Assembly
      *3 Wire Harness
      *4 Service Wire
      *a Front view of wire harness connector
      (to Front Seat Cushion Airbag Assembly RH)
      *b Front view of wire harness connector
      (to Airbag ECU Assembly)
    • Using a service wire, connect terminals 13 (FCP+) and 14 (FCP-) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition Result
      H40-1 (FCP-) - H40-2 (FCP+) Always Below 1 Ω Ω

      Result

      Proceed to
      OK
      NG

    Post-procedure1

    • Disconnect the service wire from connector B.

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  8

  8. CLEAR DTC 

    Pre-procedure1

    • Connect the airbag ECU assembly connector.
      GTY972921Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Cushion Airbag Assembly RH
      *2 Airbag ECU Assembly
      *3 Wire Harness
    • Connect the front seat cushion airbag assembly RH connector.
    • Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

      Result

      Proceed to
      NEXT

    Post-procedure1

    • Turn the ignition switch off.

    Result: 

    NEXT 

    See step  9

  9. CHECK DTC 

    Pre-procedure1

    • Turn the ignition switch to ON, and wait for at least 60 seconds.
    • Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      Result

      Result Proceed to
      B1875-13 is not output A
      B1875-13 is output B

      HINT: 

      Codes other than DTC B1875-13 may be output at this time, but they are not related to this check.

    Post-procedure1

    • None

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2022 - ] 

    Result: 

    B 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - 08/2023]  , or refer to  REMOVAL [08/2023 - ] 

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