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Home >> Toyota >> 2021 >> C-HR XLE >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (B1805-B1835) >> Airbag System >> DTC B1835/58: Short in Curtain Shield Squib LH Circuit; DTC B1836/58: Open in Curtain Shield Squib LH Circuit; DTC B1837/58: Short to GND in Curtain Shield Squib LH Circuit; DTC B1838/58: Short to B+ in Curtain Shield Squib LH Circuit [02/2017 - 10/2017] >> Procedure

DTC B1835/58: Short in Curtain Shield Squib LH Circuit; DTC B1836/58: Open in Curtain Shield Squib LH Circuit; DTC B1837/58: Short to GND in Curtain Shield Squib LH Circuit; DTC B1838/58: Short to B+ in Curtain Shield Squib LH Circuit [02/2017 - 10/2017]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
      GTY760185Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Curtain Shield Airbag Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the curtain shield airbag assembly LH and airbag sensor assembly.

      OK

      The connectors are properly connected.

      HINT: 

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the curtain shield airbag assembly LH and airbag sensor assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the floor wire connector (on the curtain shield airbag assembly LH side) is not loose, deformed or damaged.

      OK

      The connector locking button is not disengaged, and the claw of the lock is not deformed or damaged.

    7. Check that the short springs of the activation prevention mechanism of the floor wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK CURTAIN SHIELD AIRBAG ASSEMBLY LH 
    1. Connect the connector to the airbag sensor assembly.
      GTY762531Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Curtain Shield Airbag Assembly LH
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Curtain Shield Airbag Assembly LH)
    2. Connect SST (resistance 2.1 Ω) to connector C.
      WARNING:

      Never connect a tester to the curtain shield airbag assembly LH 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 it.
      • Insert SST straight into the terminals of the connector.
      • SST: 09843-18061 
    3. Connect the cable to the negative (-) battery terminal.
    4. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Clear DTCs 

    5. Turn the ignition switch off.
    6. Turn the ignition switch ON, and wait for at least 60 seconds.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1835/58, B1836/58, B1837/58 or B1838/58 is not output.

      HINT: 

      Codes other than DTCs B1835/58, B1836/58, B1837/58 and B1838/58 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.
    9. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    10. Disconnect SST from connector C.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE CURTAIN SHIELD AIRBAG ASSEMBLY LH. Refer to  REMOVAL [02/2017 - 10/2017] 

    Result: 

    NG 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Disconnect the floor wire from the airbag sensor assembly.
      GTY741930Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Curtain Shield Airbag Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a Front view of wire harness connector
      (to Curtain Shield Airbag Assembly LH)
    2. Check for a short to B+ in the circuit.
      1. Connect the cable to the negative (-) battery terminal.
      2. Turn the ignition switch ON.
      3. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        M25-1 (ICL+) - Body ground Ignition switch ON Below 1 V
        M25-2 (ICL-) - Body ground Ignition switch ON Below 1 V
      4. Turn the ignition switch off.
      5. Disconnect the cable from the negative (-) battery terminal.
        WARNING:

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Check for an open in the circuit.
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        M25-1 (ICL+) - M25-2 (ICL-) Always Below 1 Ω
    4. Check for a 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
        M25-1 (ICL+) - Body ground Always 1 MΩ or higher
        M25-2 (ICL-) - Body ground Always 1 MΩ or higher
    5. Check for a short in the circuit.
      1. Release the activation prevention mechanism built into connector B.

        Refer to DIAGNOSIS SYSTEM [02/2017 - 09/2019]

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

        Standard Resistance

        Tester Connection Condition Specified Condition
        M25-1 (ICL+) - M25-2 (ICL-) Always 1 MΩ or higher
      3. Restore the released activation prevention mechanism of connector B to the original condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the curtain shield airbag assembly LH and airbag sensor assembly.
      GTY773809Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Curtain Shield Airbag Assembly LH
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) battery terminal.
    3. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Clear DTCs 

    4. Turn the ignition switch off.
    5. Turn the ignition switch ON, and wait for at least 60 seconds.
    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1835/58, B1836/58, B1837/58 or B1838/58 is not output.

      HINT: 

      Codes other than DTCs B1835/58, B1836/58, B1837/58 and B1838/58 may be output at this time, but they are not related to this check.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [02/2017 - 10/2017] 

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [02/2017 - 10/2017] 

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