AIRBAG SYSTEM, Diagnostic DTC:B1850/62, B1851/62, B1852/62, B1853/62

DTC Code DTC Name
B1850/62 Short in Rear Side Squib RH Circuit
B1851/62 Open in Rear Side Squib RH Circuit
B1852/62 Short to GND in Rear Side Squib RH Circuit
B1853/62 Short to B+ in Rear Side Squib RH Circuit

DESCRIPTION

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

This 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 RH circuit.

DTC Code DTC Detection Condition Trouble Area
B1850/62

One of the following conditions is met:


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

  • A rear side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

  • Floor wire

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

  • Center airbag sensor assembly
B1851/62

One of the following conditions is met:


  • The center airbag sensor assembly detects an open circuit signal in the rear side squib RH circuit for 2 seconds.

  • A rear side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1852/62

One of the following conditions is met:


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

  • A rear side squib RH malfunction.

  • A center airbag sensor assembly malfunction.
B1853/62

One of the following conditions is met:


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

  • A rear side squib RH malfunction.

  • A center airbag sensor assembly malfunction.

WIRING DIAGRAM

A01FEOVE14

INSPECTION PROCEDURE

Note


  • After turning the engine 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 Click here.

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

Tech Tips

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.

PROCEDURE


  1. CHECK REAR SEAT AIRBAG ASSEMBLY RH (REAR SIDE SQUIB RH)


    1. A01FEKLE05
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3 Connector C
      *4 SST
      *a

      Front view of wire harness connector

      (to Rear Side Squib RH)
      *b Color: Red

      Turn the engine 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 airbag RH.

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

      CAUTION:

      Never connect the tester to the rear seat airbag RH (rear side squib 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

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

    6. Turn the engine switch on (IG), and wait for at least 60 seconds.

    7. Clear the DTCs Click here.

    8. Turn the engine switch off.

    9. Turn the engine switch on (IG), and wait for at least 60 seconds.

    10. Check for DTCs Click here.

      OK
      DTC B1850/62, B1851/62, B1852/62 or B1853/62 is not output.

      Tech Tips

      Codes other than DTC B1850/62, B1851/62, B1852/62 and B1853/62 may be output at this time, but they are not related to this check.

    11. Turn the engine switch off.

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

    13. Disconnect SST from connector C.


    NG

    CHECK CONNECTOR Click here

    OK

    REPLACE REAR SEAT AIRBAG ASSEMBLY RH Click here

  2. CHECK CONNECTOR


    1. Disconnect the connectors from the center airbag sensor assembly.

    2. A01FGAGE02
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Floor Wire
      *3 Center Airbag Sensor Assembly

      Check that the connectors (on the center airbag sensor assembly side and rear seat airbag RH side) are not damaged.

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

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK REAR SIDE SQUIB RH CIRCUIT


    1. A01FE60E05
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Floor Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *a

      Front view of wire harness connector

      (to Rear Side Squib RH)

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

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T17-1 (SRR+) - Body ground Engine switch on (IG) Below 1 V
      T17-2 (SRR-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine 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
      T17-1 (SRR+) - T17-2 (SRR-) Always Below 1 Ω

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T17-1 (SRR+) - T17-2 (SRR-) Always 1 MΩ or higher
      T17-1 (SRR+) - Body ground Always 1 MΩ or higher
      T17-2 (SRR-) - Body ground Always 1 MΩ or higher

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


    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A01FF54E25
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the rear seat airbag RH and center airbag sensor assembly.

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

    3. Turn the engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs Click here.

    5. Turn the engine switch off.

    6. Turn the engine switch on (IG), and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1850/62, B1851/62, B1852/62 or B1853/62 is not output.

      Tech Tips

      Codes other than DTC B1850/62, B1851/62, B1852/62 and B1853/62 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