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 rear seat side airbag assembly 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 Detection Condition Trouble Area
B1850/62

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

  • Rear side squib RH malfunction

  • Center airbag sensor malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1851/62

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

  • Rear side squib RH malfunction

  • Center airbag sensor malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1852/62

  • The center airbag sensor receives a short circuit to ground signal in the rear side squib RH circuit.

  • Rear side squib RH malfunction

  • Center airbag sensor malfunction

  • Floor wire

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

  • Center airbag sensor assembly
B1853/62

  • The center airbag sensor receives a short circuit to B+ signal in the rear side squib RH circuit.

  • Rear side squib RH malfunction

  • Center airbag sensor malfunction

  • Floor wire

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A019MVLE07

INSPECTION PROCEDURE

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 ASSEMBLY RH (REAR SIDE SQUIB RH)


    1. A019N86E02
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Rear Seat Side Airbag Assembly RH)
      *4 Connector C

      Connect the connector to the center airbag sensor assembly.

    2. Connect SST (resistance 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the rear seat side airbag assembly 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.

      • Insert SST straight into the terminals of the connector.

      SST
      09843-18061

    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the engine switch off.

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

    8. Check for DTCs Click here.

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

      Tech Tips

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


    NG

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

    OK

    REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY RH Click here

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


    1. A019K7OE02
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire
      *4

      Front view of wire harness connector

      (to Rear Seat Side Airbag Assembly RH)
      *5 Connector C

      Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      Note

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

    3. Disconnect SST from connector C.

    4. Disconnect the floor wire from the center airbag sensor assembly.

    5. Check the short to B+ in the circuit.


      1. Connect the cable to the negative (-) battery terminal.

      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
        O19-1 (SRR+) - Body ground Engine switch on (IG) Below 1 V
        O19-2 (SRR-) - Body ground Engine switch on (IG) Below 1 V

    6. Check the open in the circuit.


      1. Turn the engine switch off.

      2. Disconnect the cable from the negative (-) battery terminal.

        Note

        Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O19-1 (SRR+) - O19-2 (SRR-) Always Below 1 Ω

    7. Check the short to ground in the circuit.


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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O19-1 (SRR+) - O19-2 (SRR-) Always Below 1 Ω

    8. Check the short in the circuit.


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        O19-1 (SRR+) - O19-2 (SRR-) Always 1 MΩ or higher
        O19-1 (SRR+) - Body ground Always 1 MΩ or higher
        O19-2 (SRR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK CENTER AIRBAG SENSOR ASSEMBLY


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

    2. A019PE6E01
      Text in Illustration
      *1 Rear Side Squib RH
      *2 Center Airbag Sensor Assembly

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

    3. Connect the cable to the negative (-) battery terminal.

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

    5. Clear the DTCs stored in the memory Click here.

    6. Turn the engine switch off.

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

    8. Check for DTCs Click here.

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

      Tech Tips

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