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 ECU assembly, side airbag sensor assembly RH and side No. 2 airbag sensor assembly RH.

The side airbag sensor assembly RH detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the airbag and pretensioner should be deployed.

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

DTC No. DTC Detection Condition Trouble Area
B1620/21

  • Side airbag sensor assembly RH malfunction

  • Airbag ECU assembly malfunction

  • Side airbag sensor assembly RH

  • Airbag ECU assembly

WIRING DIAGRAM

Refer to DTCs B1622/81, B1623/81, B1632/81, B1633/81 and B1642/81 Click here.

CAUTION / NOTICE / HINT

Note

After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

PROCEDURE


  1. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. A005BPJE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly

      Turn the power switch off.

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

      CAUTION:

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

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

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

    5. Clear the DTCs stored in memory Click here.

    6. Turn the power switch off.

    7. Turn the power switch on (IG), and wait for at least 60 seconds.

    8. Check for DTCs Click here.

      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

      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.

    9. Turn the power switch off.

    10. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

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


    A

    REPLACE AIRBAG ECU ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here