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 and the rear seat side 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

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 RH circuit during the primary check.

  • A rear side squib RH malfunction.

  • A center airbag sensor malfunction.


  • No. 2 floor wire

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

  • Center airbag sensor assembly

B1851/62

When one of the following conditions is met:


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

  • A rear side squib RH malfunction.

  • A center airbag sensor malfunction.


  • No. 2 floor wire

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

  • Center airbag sensor assembly

B1852/62

When one of the following conditions is met:


  • The center airbag sensor receives 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 malfunction.


  • No. 2 floor wire

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

  • Center airbag sensor assembly

B1853/62

When one of the following conditions is met:


  • The center airbag sensor receives 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 malfunction.


  • No. 2 floor wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A01ENTRE42

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 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 RH (REAR SIDE SQUIB RH)

    A01ESDDE22

    1. 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 side 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 side 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, B1851, B1852 or B1853 is not output.

      Tech Tips

      Codes other than DTC B1850, B1851, B1852 and B1853 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
    C
    A
  2. CHECK NO. 2 FLOOR WIRE (REAR SIDE SQUIB RH CIRCUIT)

    A01EOGVE19

    1. Turn the engine switch off.

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

    3. Disconnect SST (resistance: 2.1 Ω) 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
      L16-1 (SRR+) - Body ground Engine switch on (IG) Below 1 V
      L16-2 (SRR-) - Body ground Engine switch on (IG) Below 1 V
    7. Turn the engine 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
      L16-1 (SRR+) - L16-2 (SRR-) 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
      L16-1 (SRR+) - L16-2 (SRR-) Always 1 MΩ or higher
      L16-1 (SRR+) - Body ground Always 1 MΩ or higher
      L16-2 (SRR-) - Body ground Always 1 MΩ or higher

    NG
    OK
  3. CHECK CENTER AIRBAG SENSOR

    A01ENXGE26

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

    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, B1851, B1852 or B1853 is not output.

      Tech Tips

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


    NG
    OK