AIRBAG SYSTEM, Diagnostic DTC:B1850/62,B1851/62,B1852/62 and 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 No.

Detection Item

DTC Detection Condition

Trouble Area

Test Mode / Check Mode

B1850/62

Short in Rear Side Squib RH Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Floor wire

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

  • Center airbag sensor assembly

*2

B1851/62

Open in Rear Side Squib RH Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Floor wire

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

  • Center airbag sensor assembly

*2

B1852/62

Short to GND in Rear Side Squib RH Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Floor wire

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

  • Center airbag sensor assembly

*2

B1853/62

Short to B+ in Rear Side Squib RH Circuit

One of the following conditions is met:

  • The center airbag sensor 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 malfunction.

  • Floor wire

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

  • Center airbag sensor assembly

*2

WIRING DIAGRAM

C174615E75

CAUTION / NOTICE / HINT

Note:

  • After turning the engine 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 hereClick hereClick 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 hereClick hereClick hereClick here).

Tip:

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 types of road (Click here).

PROCEDURE

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

    1. C217719C04

      *1

      Rear Side Squib RH

      *2

      Center Airbag Sensor

      *3

      Connector C

      *4

      SST

      *a

      Front view of wire harness connector

      (to Rear Side Squib RH)

      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.

    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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      Result

      Result

      Proceed to

      DTC B1850, B1851, B1852 or B1853 is not output

      A

      DTC B1850, B1851, B1852 or B1853 is output.

      B
      Tip:

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

    09843-18061

    A

    REPLACE REAR SEAT ASSEMBLY RH

    Click here

    B

  2. CHECK CONNECTOR

    1. C214775C05

      *1

      Rear Side Squib RH

      *2

      Center Airbag Sensor

      Turn the engine 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. Check that the floor wire connector (on the rear seat side airbag RH side) is not damaged.

      OK

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

      Result

      Result

      OK

      NG
    NG

    REPLACE FLOOR WIRE

    OK

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

    1. C213946C01

      *1

      Rear Side Squib RH

      *2

      Center Airbag Sensor

      *3

      Connector C

      *4

      SST

      *a

      Front view of wire harness connector

      (to Rear Side Squib RH)

      Disconnect the connectors from the center airbag sensor.

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

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

      Standard Voltage

      Tester Connection

      Switch Condition

      Specified Condition

      Q28-1 (SRR+) - Body ground

      Engine switch on (IG)

      Below 1 V

      Q28-2 (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

      Q28-1 (SRR+) - Q28-2 (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

      Q28-1 (SRR+) - Q28-2 (SRR-)

      Always

      1 MΩ or higher

      Q28-1 (SRR+) - Body ground

      Always

      1 MΩ or higher

      Q28-2 (SRR-) - Body ground

      Always

      1 MΩ or higher

      Result

      Result

      OK

      NG
    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK CENTER AIRBAG SENSOR

    1. C146261C02

      *1

      Rear Side Squib RH

      *2

      Center Airbag Sensor

      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

      Body Electrical > SRS Airbag > Clear DTCs

    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

      Body Electrical > SRS Airbag > Trouble Codes

      OK

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

      Tip:

      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

      OK

      NG
    OK

    USE SIMULATION METHOD TO CHECK

    Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    Click here