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Home >> Toyota >> 2018 >> Mirai >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (2 Of 3) >> Airbag System >> DTC B1811-53: Open in Driver Side Squib 2nd Step Circuit [06/2015 - ] >> Procedure

DTC B1811-53: Open in Driver Side Squib 2nd Step Circuit [06/2015 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the power switch off.
      GTY438987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
    2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the horn button assembly, spiral cable sub-assembly 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 horn button assembly, spiral cable sub-assembly and airbag sensor assembly.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the spiral cable sub-assembly connector (on the horn button assembly side) is not damaged.

      OK

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

    7. Check that the short springs for the instrument panel wire and spiral cable sub-assembly with the activation prevention mechanism are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  2

  2. CHECK DRIVER SIDE SQUIB 2ND STEP CIRCUIT 
    1. Connect the instrument panel wire to the spiral cable sub-assembly.
      GTY563405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Horn Button Assembly)
      *b Color: Orange
    2. 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
        z6-2 (D2+) - z6-1 (D2-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  5

    Result: 

    OK 

    See step  3

  3. CHECK DTC 
    1. Connect the connectors to the airbag sensor assembly.
      GTY610507Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Horn Button Assembly)
      *b Service Wire
      *c Color: Orange
    2. Using a service wire, connect terminals 2 (D2+) and 1 (D2-) of connector E.
      NOTE:

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

    3. Connect the cable to the negative (-) auxiliary battery terminal.
    4. Turn the power switch on (IG), and wait for at least 60 seconds.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Clear DTCs 

    6. Turn the power switch off.
    7. Turn the power switch on (IG), and wait for at least 60 seconds.
    8. Check for DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1811/53 is not output.

      HINT: 

      Codes other than DTC B1811/53 may be output at this time, but they are not related to this check.

    9. Turn the power switch off.
    10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
    11. Disconnect the service wire from connector E.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the horn button assembly.
      GTY447904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Clear DTCs 

    5. Turn the power switch off.
    6. Turn the power switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs.

      Refer to DTC CHECK / CLEAR [06/2015 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1811/53 is not output.

      HINT: 

      Codes other than DTC B1811/53 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 [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    NG 

    REPLACE HORN BUTTON ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the instrument panel wire from the spiral cable sub-assembly.
      GTY572270Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Spiral Cable Sub-assembly)
    2. 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
        G50-4 (D2+) - G50-3 (D2-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  6

  6. CHECK SPIRAL CABLE SUB-ASSEMBLY 
    1. Check for an open in the circuit.
      GTY604391Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Horn Button Assembly
      *2 Spiral Cable Sub-assembly
      *3 Airbag Sensor Assembly
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Horn Button Assembly)
      *b Color: Orange
      1. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        z6-2 (D2+) - z6-1 (D2-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

    Result: 

    NG 

    REPLACE SPIRAL CABLE SUB-ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

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