AIRBAG SYSTEM, Diagnostic DTC:B1620/21

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

DESCRIPTION

The side airbag sensor RH consists of a safing sensor, diagnostic circuit, lateral deceleration sensor, etc.

If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

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

DTC Code Detection Condition Trouble Area
B1620/21

One of the following conditions is met:


  • A side airbag sensor RH malfunction.

  • A center airbag sensor malfunction.

  • Side airbag sensor assembly RH

  • Rear airbag sensor RH

  • No. 2 floor wire

  • Center airbag sensor assembly

WIRING DIAGRAM

A004MM1E04
*a Side Airbag Sensor RH
*b Rear Airbag Sensor RH
*c Center Airbag Sensor

CAUTION / NOTICE / HINT

Note


  • After turning the ignition 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 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.

PROCEDURE


  1. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

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

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

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and side airbag sensor RH.

    2. Check that the connectors (on the center airbag sensor side and side airbag sensor RH side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (SIDE AIRBAG SENSOR RH CIRCUIT)

    A004NEAE02
    Text in Illustration
    *1 Side Airbag Sensor RH
    *2 No. 2 Floor Wire
    *3 Center Airbag Sensor
    *4 Connector C
    *5 Connector B
    *6 Service Wire
    *a

    Rear view of wire harness connector

    (to Side Airbag Sensor RH)
    *b

    Rear view of wire harness connector

    (to Center Airbag Sensor)

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H6-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      H6-3 (BBR-) - Body ground

    3. Turn the ignition switch off.

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

    5. 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 a service wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H6-4 (BBR+) - H6-3 (BBR-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H6-4 (BBR+) - H6-3 (BBR-) Always 1 MΩ or higher
      H6-4 (BBR+) - Body ground
      H6-3 (BBR-) - Body ground

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK SIDE AIRBAG SENSOR RH

    A004NVWE27
    Text in Illustration
    *1 Side Airbag Sensor LH
    *2 Center Airbag Sensor

    1. Connect the connector to the center airbag sensor.

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

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

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

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

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1620 and B1625 are not output A
      DTC B1625 is output B
      DTC B1620 is output C

      Tech Tips

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

    9. Turn the ignition switch off.

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

    11. Return the side airbag sensor LH and RH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

  5. CHECK CONNECTION OF CONNECTOR


    1. Check that the connector is properly connected to the rear airbag sensor RH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTOR PROPERLY

    OK

  6. CHECK CONNECTOR


    1. Disconnect the connectors from the side airbag sensor RH and rear airbag sensor RH.

    2. Check that the connector (on the rear airbag sensor RH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  7. CHECK NO. 2 FLOOR WIRE (REAR AIRBAG SENSOR RH CIRCUIT)

    A004MLRE02
    Text in Illustration
    *1 Rear Airbag Sensor RH
    *2 No. 2 Floor Wire
    *3 Side Airbag Sensor RH
    *4 Connector C
    *5 Connector B
    *6 Service Wire
    *a

    Rear view of wire harness connector

    (to Rear Airbag Sensor RH)
    *b

    Rear view of wire harness connector

    (to Side Airbag Sensor RH)

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H8-2 (BCR+) - Body ground Ignition switch ON Below 1 V
      H8-1 (BCR-) - Body ground

    3. Turn the ignition switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H8-2 (BCR+) - H8-1 (BCR-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H8-2 (BCR+) - H8-1 (BCR-) Always 1 MΩ or higher
      H8-2 (BCR+) - Body ground
      H8-1 (BCR-) - Body ground

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  8. CHECK FOR DTC

    A004QQJE01
    Text in Illustration
    *1 Rear Airbag Sensor RH
    *2 Side Airbag Sensor RH

    1. Connect the connector to the side airbag sensor RH.

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

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

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

    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.

      OK
      DTC B1620 is output.
      Result
      Result Proceed to
      OK A
      NG (for Sedan) B
      NG (for Wagon) C

      Tech Tips

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


    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

    REPLACE REAR AIRBAG SENSOR RH Click here

    A

  9. CHECK SIDE AIRBAG SENSOR RH

    A004NVWE28
    Text in Illustration
    *1 Side Airbag Sensor LH
    *2 Center Airbag Sensor

    1. Interchange the side airbag sensor LH with RH and connect the connectors to them.

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

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

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

    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.

      Result
      Result Proceed to
      DTC B1620 and B1625 are not output A
      DTC B1625 is output B
      DTC B1620 is output C

      Tech Tips

      Codes other than DTC B1620 and B1625 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, and wait for at least 90 seconds.

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here