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

  • *: w/ Curtain Shield Airbags

WIRING DIAGRAM

  1. w/o Curtain Shield Airbags

    C246440E15

  2. w/ Curtain Shield Airbags

    C239250E24

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 hereClick hereClick 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

    CHECK CONNECTORSClick here

    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.

      Tip:

      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

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (OPEN)

    1. C246441C02

      *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

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (SHORT)

    1. C246442C01

      *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

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (SHORT TO B+)

    1. C246442C01

      *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

    REPLACE FLOOR WIRE

    OK

  6. CHECK FLOOR WIRE (SHORT TO GROUND)

    1. C246442C01

      *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

    REPLACE FLOOR WIRE

    OK

  7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

    1. C238218C02

      *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

      Tip:

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

    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.

    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
    A

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

    Click here

    C

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick here

  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.

      Tip:

      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

    REPLACE FLOOR WIRE

    OK

  9. CHECK FLOOR WIRE (OPEN)

    1. C238219C02

      *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

    REPLACE FLOOR WIRE

    OK

  10. CHECK FLOOR WIRE (SHORT)

    1. C238220C08

      *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

    REPLACE FLOOR WIRE

    OK

  11. CHECK FLOOR WIRE (SHORT TO B+)

    1. C238220C08

      *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

    REPLACE FLOOR WIRE

    OK

  12. CHECK FLOOR WIRE (SHORT TO GROUND)

    1. C238220C08

      *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

    REPLACE FLOOR WIRE

    OK

  13. CHECK FLOOR WIRE (OPEN)

    1. C256981C01

      *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

    REPLACE FLOOR WIRE

    OK

  14. CHECK FLOOR WIRE (SHORT)

    1. C238222C11

      *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

    REPLACE FLOOR WIRE

    OK

  15. CHECK FLOOR WIRE (SHORT TO B+)

    1. C238222C11

      *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

    REPLACE FLOOR WIRE

    OK

  16. CHECK FLOOR WIRE (SHORT TO GROUND)

    1. C238222C11

      *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

    REPLACE FLOOR WIRE

    OK

  17. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

    1. C238218C02

      *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

      Tip:

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

    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.

    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
    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH

    Click here

    C

    USE SIMULATION METHOD TO CHECK

    Click hereClick hereClick hereClick hereClick hereClick here

    A

  18. CHECK REAR AIRBAG SENSOR RH

    1. C265158C01

      *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.

      Tip:

      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

    REPLACE REAR AIRBAG SENSOR RH

    Click here

    NG

    REPLACE AIRBAG SENSOR ASSEMBLY

    Click here