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AIRBAG SYSTEM(for Type C), Diagnostic DTC:B1925/78, B1926/78, B1927/78, B1928/78

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DTC Code DTC Name
B1925/78 Short in Rear Pretensioner Squib LH Circuit
B1926/78 Open in Rear Pretensioner Squib LH Circuit
B1927/78 Short to GND in Rear Pretensioner Squib LH Circuit
B1928/78 Short to B+ in Rear Pretensioner Squib LH Circuit
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DESCRIPTION

The rear pretensioner LH circuit consists of the airbag sensor assembly and rear No. 1 seat outer belt assembly LH.

This circuit instructs the SRS to deploy when deployment conditions are met.

These DTCs are stored when a malfunction is detected in the rear pretensioner LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1925/78 Short in Rear Pretensioner Squib LH Circuit

One of the following conditions is met:


  • The airbag sensor assembly detects a line short circuit signal 5 times in the rear pretensioner LH circuit during the primary check.

  • A rear No. 1 seat outer belt assembly LH malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear No. 1 seat outer belt assembly LH

  • Airbag sensor assembly

B1926/78 Open in Rear Pretensioner Squib LH Circuit

One of the following conditions is met:


  • The airbag sensor assembly detects an open circuit signal in the rear pretensioner LH circuit for 2 seconds.

  • A rear No. 1 seat outer belt assembly LH malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear No. 1 seat outer belt assembly LH

  • Airbag sensor assembly

B1927/78 Short to GND in Rear Pretensioner Squib LH Circuit

One of the following conditions is met:


  • The airbag sensor assembly detects a short circuit to ground signal in the rear pretensioner LH circuit for 0.5 seconds.

  • A rear No. 1 seat outer belt assembly LH malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear No. 1 seat outer belt assembly LH

  • Airbag sensor assembly

B1928/78 Short to B+ in Rear Pretensioner Squib LH Circuit

One of the following conditions is met:


  • The airbag sensor assembly detects a short circuit to B+ signal in the rear pretensioner LH circuit for 0.5 seconds.

  • A rear No. 1 seat outer belt assembly LH malfunction.

  • An airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Rear No. 1 seat outer belt assembly LH

  • Airbag sensor assembly

Table 1. *a Rear No. 1 Seat Outer Belt Assembly LH *b Airbag Sensor Assembly
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WIRING DIAGRAM

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CAUTION / NOTICE / HINT

Note:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

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  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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  • After replacing the airbag sensor assembly, refer to initialization.

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Tip:

To perform the simulation method, enter check mode (signal check) with the GTS (Click here ), and then wiggle each connector of the airbag system or drive the vehicle on various types of road (Click here).

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PROCEDURE


  1. Click here

    CHECK REAR NO. 1 SEAT OUTER BELT ASSEMBLY LH


    1. B0028JDC20
      *1 Rear No. 1 Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Rear No. 1 Seat Outer Belt Assembly LH)

      Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Disconnect the connector from the rear No. 1 seat outer belt assembly LH.

    4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the rear No. 1 seat outer belt 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 SST.

      • Insert SST straight into the terminals of the connector.

      09843-18061

    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    7. Clear the DTCs.

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      1. Body Electrical > SRS Airbag > Clear DTCs


    8. Turn the ignition switch off.

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

    10. Check for DTCs.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1925/78, B1926/78, B1927/78 or B1928/78 is not output
      DTC B1925/78, B1926/78, B1927/78 or B1928/78 is output
      Tip:

      Codes other than DTC B1925/78, B1926/78, B1927/78 or B1928/78 may be output at this time, but they are not related to this check.

    11. Turn the ignition switch off.

    12. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    13. Disconnect SST from connector C.


    • DTC B1925/78, B1926/78, B1927/78 or B1928/78 is not output

      REPLACE REAR NO. 1 SEAT OUTER BELT ASSEMBLY LH for Double Cab:Click here

      REPLACE REAR NO. 1 SEAT OUTER BELT ASSEMBLY LH for Smart Cab:Click here

    • DTC B1925/78, B1926/78, B1927/78 or B1928/78 is outputClick here
  2. Click here

    CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly.

    2. B0028OXC02
      *1 Rear No. 1 Seat Outer Belt Assembly LH
      *2 No. 2 Floor Wire
      *3 Airbag Sensor Assembly

      Check that the connectors (on the airbag sensor assembly side and rear No. 1 seat outer belt assembly LH side) are not damaged.

      OK
      The lock button is not disengaged, and the claw of the lock is not deformed or damaged.
      Result
      Proceed to
      OK
      NG

  3. Click here

    CHECK NO. 2 FLOOR WIRE


    1. B00246LC25
      *1 Rear No. 1 Seat Outer Belt Assembly LH
      *2 No. 2 Floor Wire
      *3 Airbag Sensor Assembly
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Rear No. 1 Seat Outer Belt Assembly LH)

      Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      N43-1 (RL-) - Body ground Ignition switch ON Below 1 V
      N43-2 (RL+) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N43-1 (RL-) - N43-2 (RL+) Always Below 1 Ω

    7. Release the activation prevention mechanism built into connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N43-1 (RL-) - N43-2 (RL+) Always 1 MΩ or higher

    9. Restore the released activation prevention mechanism of connector B to its original condition.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N43-1 (RL-) - Body ground Always 1 MΩ or higher
      N43-2 (RL+) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

  4. Click here

    CHECK DTC


    1. B0028JWC30
      *1 Rear No. 1 Seat Outer Belt Assembly LH
      *2 Airbag Sensor Assembly

      Connect the connectors to the rear No. 1 seat outer belt assembly LH and airbag sensor assembly.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

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

    4. Clear the DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Clear DTCs


    5. Turn the ignition switch off.

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

    7. Check for DTCs.

      Click here


      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B1925/78, B1926/78, B1927/78 or B1928/78 is not output
      DTC B1925/78, B1926/78, B1927/78 or B1928/78 is output
      Tip:

      Codes other than DTC B1925/78, B1926/78, B1927/78 and B1928/78 may be output at this time, but they are not related to this check.


    • DTC B1925/78, B1926/78, B1927/78 or B1928/78 is not output

      USE SIMULATION METHOD TO CHECKClick here

    • DTC B1925/78, B1926/78, B1927/78 or B1928/78 is output

      REPLACE AIRBAG SENSOR ASSEMBLYClick here