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 the rear seat side airbag RH.

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

These DTCs are recorded when a malfunction is detected in the rear side squib RH circuit.

DTC Code Detection Condition Trouble Area
B1850/62

One of the following conditions is met:


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

  • Rear side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Rear seat wire RH

  • Rear seat side 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 receives an open circuit signal in the rear side squib RH circuit for 2 seconds.

  • Rear side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Rear seat wire RH

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

  • Center airbag sensor assembly
B1852/62

One of the following conditions is met:


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

  • Rear side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Rear seat wire RH

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

  • Center airbag sensor assembly
B1853/62

One of the following conditions is met:


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

  • Rear side squib RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Rear seat wire RH

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

  • Center airbag sensor assembly

WIRING DIAGRAM

A01GMKME32

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


  • Perform the simulation method by selecting "check mode" (signal check) with the intelligent tester Click here.

  • After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Click here.

PROCEDURE


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

    A01GKYWE09

    1. Turn the engine switch off.

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

      CAUTION:

      Never connect a 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 negative (-) terminal cable to the battery, 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, 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.

      Result
      Result Proceed to
      OK (for Power Seat) A
      OK (for 4-Passenger with Ottoman) B
      OK (for Fixed Seat Type) C
      NG D

    A

    REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY RH Click here

    B

    REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY RH Click here

    C

    REPLACE REAR SEAT SIDE AIRBAG ASSEMBLY RH Click here

    D

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

    A01GIU3E08

    1. Turn the engine switch off.

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

    3. Disconnect SST from connector C.

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

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

    6. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      f19-1 (SRR+) - Body ground Engine switch on (IG) Below 1 V
      f19-2 (SRR-) - Body ground Engine switch on (IG) Below 1 V

    8. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f19-1 (SRR+) - f19-2 (SRR-) Always Below 1 Ω

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f19-1 (SRR+) - f19-2 (SRR-) Always 1 MΩ or higher
      f19-1 (SRR+) - Body ground Always 1 MΩ or higher
      f19-2 (SRR-) - Body ground Always 1 MΩ or higher

    OK

    CHECK CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

  3. CHECK REAR SEAT WIRE RH

    A01GJPJE04

    1. Disconnect the floor wire connector from the rear seat wire.

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

    3. Turn the engine switch on (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      f19-1 (SRR+) - Body ground Engine switch on (IG) Below 1 V
      f19-2 (SRR-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f19-1 (SRR+) - f19-2 (SRR-) Always Below 1 Ω

    8. Release the activation prevention mechanism built into connector D Click here.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      f19-1 (SRR+) - f19-2 (SRR-) Always 1 MΩ or higher
      f19-1 (SRR+) - Body ground Always 1 MΩ or higher
      f19-2 (SRR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE REAR SEAT WIRE RH

    OK

    REPLACE FLOOR WIRE

  4. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A01GKFLE06

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

    2. Connect the negative (-) terminal cable to the battery, 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, 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