AIRBAG SYSTEM, Diagnostic DTC:B1620/21

DTC Code DTC Name
B1620/21 Side Airbag Sensor RH Circuit Malfunction

DESCRIPTION

The side collision sensor RH circuit (to determine deployment of the front seat airbag assembly RH, curtain shield airbag assembly RH* and front seat outer belt assembly RH) is composed of the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH*.

The side airbag sensor assembly RH and rear airbag sensor RH* detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbags and pretensioner should be deployed.

DTC B1620/21 is stored when a malfunction is detected in the side collision sensor RH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Test Mode / Check Mode
B1620/21 Side Airbag Sensor RH Circuit Malfunction
  • The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor RH circuit.

  • Side airbag sensor assembly RH malfunction

  • Rear airbag sensor RH malfunction*

  • Airbag sensor assembly malfunction


  • Floor wire

  • Side airbag sensor assembly RH

  • Rear airbag sensor RH*

  • Airbag sensor assembly

Does not apply to test/check mode

WIRING DIAGRAM


  1. w/o Curtain Shield Airbags

    B00431AE15
    *a Side Airbag Sensor Assembly RH
    *b Airbag Sensor Assembly
  2. w/ Curtain Shield Airbags

    B0043WBE24
    *a Side Airbag Sensor Assembly RH
    *b Rear Airbag Sensor RH
    *c Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note

After turning the ignition 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

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Choose the model to be inspected.

      Result
      Result Proceed to
      w/o Curtain Shield Airbags A
      w/ Curtain Shield Airbags B

    B
    A
  2. CHECK CONNECTORS


    1. Turn the ignition switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag sensor assembly and side airbag sensor assembly RH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly and side airbag sensor assembly RH.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK FLOOR WIRE (OPEN)


    1. B0043CTC02
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      Using a service wire, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L59-2 (BBR+) - L59-1 (BBR-) Always Below 1 Ω
    3. Disconnect the service wire from connector B.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. CHECK FLOOR WIRE (SHORT)


    1. B0044I1C01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L59-2 (BBR+) - L59-1 (BBR-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. CHECK FLOOR WIRE (SHORT TO B+)


    1. B0044I1C01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L59-2 (BBR+) - Body ground Ignition switch ON Below 1 V
      L59-1 (BBR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.

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

      CAUTION:

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

      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. B0044I1C01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L59-2 (BBR+) - Body ground Always 1 MΩ or higher
      L59-1 (BBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. B0044ZMC02
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

    2. Interchange the side airbag sensor assembly RH with LH and connect the connectors.

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs
    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than DTCs B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      DTC B1620/21 is output. A
      DTC B1625/22 is output. B
      DTCs B1620/21 and B1625/22 are not output. C
    8. Turn the ignition switch off.

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

      CAUTION:

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

    10. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors.


    A
    B
    C
  8. CHECK CONNECTORS


    1. Turn the ignition switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly, side airbag sensor assembly RH and rear airbag sensor RH.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  9. CHECK FLOOR WIRE (OPEN)


    1. B0043AYC02
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      *b

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      Using a service wire, connect terminals 8 (BBR+) and 11 (BBR-) of connector B.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-4 (BBR+) - L29-3 (BBR-) Always Below 1 Ω
    3. Disconnect the service wire from connector B.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  10. CHECK FLOOR WIRE (SHORT)


    1. B0041RGC08
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-4 (BBR+) - L29-3 (BBR-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  11. CHECK FLOOR WIRE (SHORT TO B+)


    1. B0041RGC08
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L29-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      L29-3 (BBR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.

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

      CAUTION:

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

      Result
      Proceed to
      OK
      NG

    NG
    OK
  12. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. B0041RGC08
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-4 (BBR+) - Body ground Always 1 MΩ or higher
      L29-3 (BBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  13. CHECK FLOOR WIRE (OPEN)


    1. B0044AUC01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      Using a service wire, connect terminals 2 (BCR+) and 1 (BCR-) of connector C.

      Note

      Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-1 (BCR+) - L29-2 (BCR-) Always Below 1 Ω
    3. Disconnect the service wire from connector C.

      Result
      Proceed to
      OK
      NG

    NG
    OK
  14. CHECK FLOOR WIRE (SHORT)


    1. B00454SC11
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-1 (BCR+) - L29-2 (BCR-) Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  15. CHECK FLOOR WIRE (SHORT TO B+)


    1. B00454SC11
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      L29-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      L29-2 (BCR-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition switch off.

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

      CAUTION:

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

      Result
      Proceed to
      OK
      NG

    NG
    OK
  16. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. B00454SC11
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH
      *3 Floor Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L29-1 (BCR+) - Body ground Always 1 MΩ or higher
      L29-2 (BCR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  17. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. B0044ZMC02
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly

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

    2. Interchange the side airbag sensor assembly RH with LH and connect the connectors.

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

    4. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs
    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than DTCs B1620/21 and B1625/22 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      DTC B1620/21 is output. A
      DTC B1625/22 is output. B
      DTCs B1620/21 and B1625/22 are not output. C
    8. Turn the ignition switch off.

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

      CAUTION:

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

    10. Return the side airbag sensor assembly RH and LH to their original positions and connect the connectors.


    B
    C
    A
  18. CHECK REAR AIRBAG SENSOR RH


    1. B0043MYC01
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor Assembly RH

      Disconnect the connector from the rear airbag sensor RH.

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

    3. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs
    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON, and wait for at least 60 seconds.

    6. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      OK
      DTC B1620/21 is not output.

      Tech Tips

      Codes other than DTC B1620/21 may be output at this time, but they are not related to this check.

      Result
      Proceed to
      OK
      NG

    OK
    NG