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AIRBAG SYSTEM, Diagnostic DTC:B1620/21

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DTC Code DTC Name
B1620/21 Side Airbag Sensor RH Circuit Malfunction
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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 (w/ Curtain Shield Airbag)

  • No. 2 floor wire

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

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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 (See page ).

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PROCEDURE


  1. Click here

    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.

  2. Click here

    CHECK CONNECTORS


    1. A01IPBHE01

      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.
      Table 1. Text in Illustration
      *1 Side Airbag Sensor RH
      *2 No. 2 Floor Wire
      *3 Center Airbag Sensor

  3. Click here

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


    1. A01IRBWE04

      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
      w/ Curtain Shield Airbag
      Tester Connection Switch Condition Specified Condition
      O17-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      O17-3 (BBR-) - Body ground
      w/o Curtain Shield Airbag
      Tester Connection Switch Condition Specified Condition
      O18-2 (BBR+) - Body ground Ignition switch ON Below 1 V
      O18-1 (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
      w/ Curtain Shield Airbag
      Tester Connection Condition Specified Condition
      O17-4 (BBR+) - O17-3 (BBR-) Always Below 1 Ω
      w/o Curtain Shield Airbag
      Tester Connection Condition Specified Condition
      O18-2 (BBR+) - O18-1 (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
      w/ Curtain Shield Airbag
      Tester Connection Condition Specified Condition
      O17-4 (BBR+) - O17-3 (BBR-) Always 1 MΩ or higher
      O17-4 (BBR+) - Body ground
      O17-3 (BBR-) - Body ground
      w/o Curtain Shield Airbag
      Tester Connection Condition Specified Condition
      O18-2 (BBR+) - O18-1 (BBR-) Always 1 MΩ or higher
      O18-2 (BBR+) - Body ground
      O18-1 (BBR-) - Body ground
      Table 2. Text in Illustration
      *1 Side Airbag Sensor RH
      *2 No. 2 Floor Wire
      *3 Center Airbag Sensor
      *4

      Rear view of wire harness connector

      (to Side Airbag Sensor RH)
      *5 Connector C
      *6

      Rear view of wire harness connector

      (to Center Airbag Sensor)
      *7 Connector B
      *8 Service Wire
      *9 w/ Curtain Shield Airbag
      *10 w/o Curtain Shield Airbag

  4. Click here

    CHECK SIDE AIRBAG SENSOR RH


    1. A01IP5VE27

      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).

      Table 3. Result
      Result Proceed to
      DTC B1620 and B1625 are not output A
      DTC B1625 is output B
      DTC B1620 is output (w/o Curtain Shield Airbag) C
      DTC B1620 is output (w/ Curtain Shield Airbag) D
      Tip:

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

      Table 4. Text in Illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor

    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.


  5. Click here

    CHECK CONNECTION OF CONNECTORS


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

      OK
      The connector is properly connected.

  6. Click here

    CHECK CONNECTORS


    1. A01IUFPE01

      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.
      Table 5. Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 No. 2 Floor Wire
      *3 Side Airbag Sensor RH

  7. Click here

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


    1. A01IP1JE07

      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
      O19-2 (BCR+) - Body ground Ignition switch ON Below 1 V
      O19-1 (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
      O19-2 (BCR+) - O19-1 (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
      O19-2 (BCR+) - O19-1 (BCR-) Always 1 MΩ or higher
      O19-2 (BCR+) - Body ground
      O19-1 (BCR-) - Body ground
      Table 6. Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 No. 2 Floor Wire
      *3 Side Airbag Sensor RH
      *4

      Rear view of wire harness connector

      (to Rear Airbag Sensor RH)
      *5 Connector C
      *6

      Rear view of wire harness connector

      (to Side Airbag Sensor RH)
      *7 Connector B
      *8 Service Wire

  8. Click here

    CHECK FOR DTC


    1. A01IO9SE01

      Connect the connectors 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.
      Table 7. Result
      Result Proceed to
      OK A
      NG (w/ Rear No. 2 Seat) B
      NG (w/o Rear No. 2 Seat) C
      Tip:

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

      Table 8. Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH

  9. Click here

    CHECK SIDE AIRBAG SENSOR RH


    1. A01IP5VE28

      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).

      Table 9. Result
      Result Proceed to
      DTC B1620 and B1625 are not output A
      DTC B1625 is output B
      DTC B1620 is output C
      Tip:

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

      Table 10. Text in Illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor

    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.


  10. Click here

    CONNECT CONNECTORS PROPERLY

  11. Click here

    REPLACE NO. 2 FLOOR WIRE

  12. Click here

    USE SIMULATION METHOD TO CHECKClick here

  13. Click here

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RHClick here

  14. Click here

    REPLACE NO. 2 FLOOR WIRE

  15. Click here

    REPLACE REAR AIRBAG SENSOR RHClick here

  16. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  17. Click here

    REPLACE REAR AIRBAG SENSOR RHClick here