AIRBAG SYSTEM, Diagnostic DTC:B1855/63, B1856/63, B1857/63, B1858/63

DTC Code DTC Name
B1855/63 Short in Rear Side Squib LH Circuit
B1856/63 Open in Rear Side Squib LH Circuit
B1857/63 Short to GND in Rear Side Squib LH Circuit
B1858/63 Short to B+ in Rear Side Squib LH Circuit

DESCRIPTION

The rear side squib LH circuit consists of the center airbag sensor and the rear seat side airbag LH.

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

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

DTC Code DTC Detection Condition Trouble Area
B1855/63

When one of the following conditions is met:


  • The center airbag sensor receives a line short circuit signal 5 times in the rear side squib LH circuit during the primary check.

  • A rear side squib LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear seat side airbag assembly LH (Rear side squib LH)

  • Center airbag sensor assembly
B1856/63

When one of the following conditions is met:


  • The center airbag sensor receives an open circuit signal in the rear side squib LH circuit for 2 seconds.

  • A rear side squib LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear seat side airbag assembly LH (Rear side squib LH)

  • Center airbag sensor assembly
B1857/63

When one of the following conditions is met:


  • The center airbag sensor receives a short circuit to ground signal in the rear side squib LH circuit for 0.5 seconds.

  • A rear side squib LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear seat side airbag assembly LH (Rear side squib LH)

  • Center airbag sensor assembly
B1858/63

When one of the following conditions is met:


  • The center airbag sensor receives a short circuit to B+ signal in the rear side squib LH circuit for 0.5 seconds.

  • A rear side squib LH malfunction.

  • A center airbag sensor malfunction.

  • Floor wire

  • Rear seat side airbag assembly LH (Rear side squib LH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A0158J4E41

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

Tech Tips

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

PROCEDURE


  1. CHECK REAR SEAT SIDE AIRBAG LH (REAR SIDE SQUIB LH)


    1. A0155GVE16

      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 seat side airbag LH.

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

      CAUTION:

      Never connect the tester to the rear seat side airbag LH (rear side squib 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.

      SST
      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 Click here.

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

      OK
      DTC B1855, B1856, B1857 or B1858 is not output.

      Tech Tips

      Codes other than DTC B1855, B1856, B1857 and B1858 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    REPLACE REAR NO. 1 SEAT ASSEMBLY LH Click here

    C

    CHECK FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT) Click here

    A

    REPLACE REAR NO. 1 SEAT ASSEMBLY LH Click here

  2. CHECK FLOOR WIRE (REAR SIDE SQUIB LH CIRCUIT)


    1. A0155MEE18

      Turn the ignition switch off.

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

    3. Disconnect SST from connector C.

    4. Disconnect the connectors from the center airbag sensor.

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Kz5-1 (SRL+) - Body ground Ignition switch ON Below 1 V
      Kz5-2 (SRL-) - Body ground Ignition switch ON Below 1 V

    7. Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Kz5-1 (SRL+) - Kz5-2 (SRL-) Always Below 1 Ω

    10. Release the activation prevention mechanism built into connector B Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Kz5-1 (SRL+) - Kz5-2 (SRL-) Always 1 MΩ or higher
      Kz5-1 (SRL+) - Body ground Always 1 MΩ or higher
      Kz5-2 (SRL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK CENTER AIRBAG SENSOR


    1. A015910E21

      Connect the connectors to the rear seat side airbag LH and the center airbag sensor.

    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.

    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.

      OK
      DTC B1855, B1856, B1857 or B1858 is not output.

      Tech Tips

      Codes other than DTC B1855, B1856, B1857 and B1858 may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here