AIRBAG SYSTEM, Diagnostic DTC:B1620/21

DTC Code DTC Name
B1620/21 Driver Side - Side Airbag Sensor Circuit Malfunction

DESCRIPTION

The side airbag sensor (driver side) consists of the safing sensor, the diagnostic circuit, the 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 recorded when a malfunction is detected in the side airbag sensor (driver side) circuit.

DTC Code Detection Condition Trouble Area
B1620/21

One of the following conditions is met:


  • A side airbag sensor (driver side) malfunction

  • A center airbag sensor malfunction

  • Side airbag sensor (driver side)

  • Rear airbag sensor (driver side)

  • Floor wire

  • Center airbag sensor assembly

WIRING DIAGRAM

A01DXKGE09
A01DXZ0E12

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK VEHICLE CONDITION


    1. Check vehicle condition.

      Result
      Result Proceed to
      for LHD A
      for RHD B

    A

    CHECK CONNECTION OF CONNECTORS Click here

    B

  2. 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

  3. CHECK CONNECTORS


    1. A01DVK7E02
      Text in illustration
      *1 Side Airbag Sensor RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire

      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 FLOOR WIRE

    OK

  4. CHECK SIDE AIRBAG SENSOR RH CIRCUIT


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

      A01DYOME01
      Text in illustration
      *A for Extra Cab, Double Cab *B for Single Cab
      *1 Side Airbag Sensor RH *2 Center Airbag Sensor Assembly
      *3 Floor Wire *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 Assembly)

    2. Turn the ignition switch to ON.

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

      Standard Voltage (for Extra Cab, Double Cab)
      Tester Connection Switch Condition Specified Condition
      F24-3 (BBR-) - Body ground Ignition switch ON Below 1 V
      F24-4 (BBR+) - Body ground
      Standard Voltage (for Single Cab)
      Tester Connection Switch Condition Specified Condition
      F37-1 (BBR-) - Body ground Ignition switch ON Below 1 V
      F37-2 (BBR+) - Body ground

    4. Turn the ignition switch off.

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

    6. Using a service wire, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.

      Note

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

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

      Standard Resistance (for Extra Cab, Double Cab)
      Tester Connection Condition Specified Condition
      F24-3 (BBR-) - F24-4 (BBR+) Always Below 1 Ω
      Standard Resistance (for Single Cab)
      Tester Connection Condition Specified Condition
      F37-1 (BBR-) - F37-2 (BBR+) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance (for Extra Cab, Double Cab)
      Tester Connection Condition Specified Condition
      F24-3 (BBR-) - F24-4 (BBR+) Always 1 MΩ or higher
      F24-3 (BBR-) - Body ground
      F24-4 (BBR+) - Body ground
      Standard Resistance (for Single Cab)
      Tester Connection Condition Specified Condition
      F37-1 (BBR-) - F37-2 (BBR+) Always 1 MΩ or higher
      F37-1 (BBR-) - Body ground
      F37-2 (BBR+) - Body ground

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK SIDE AIRBAG SENSOR RH


    1. A01E0LVE04
      Text in illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor Assembly

      Connect the connector to the center airbag sensor.

    2. Interchange the side airbag sensor RH with LH 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 B1620/21 and B1625/22 are not output A
      DTC B1625/22 is output B
      DTC B1620/21 is output (for Single Cab) C
      DTC B1620/21 is output (for Extra Cab, Double Cab) D

      Tech Tips

      Codes other than DTC B1620/21 and B1625/22 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

    B

    REPLACE SIDE AIRBAG SENSOR RH

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    D

  6. CHECK CONNECTION OF CONNECTORS


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

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  7. CHECK CONNECTORS


    1. A01DYYOE03
      Text in illustration
      *1 Rear Airbag Sensor RH
      *2 Floor Wire
      *3 Side Airbag Sensor RH

      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 FLOOR WIRE

    OK

  8. CHECK REAR AIRBAG SENSOR RH CIRCUIT


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

      A01DZQWE01
      Text in illustration
      *1 Rear Airbag Sensor RH *2 Side Airbag Sensor RH
      *3 Connector C *4 Connector B
      *5 Service Wire *6 Floor 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)

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R13-2 (BCR+) - Body ground Ignition switch ON Below 1 V
      R13-1 (BCR-) - Body ground

    4. Turn the ignition switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R13-2 (BCR+) - R13-1 (BCR-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R13-2 (BCR+) - R13-1 (BCR-) Always 1 MΩ or higher
      R13-2 (BCR+) - Body ground
      R13-1 (BCR-) - Body ground

    NG

    REPLACE FLOOR WIRE

    OK

  9. CHECK DTC


    1. A01E0TVE01
      Text in illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor RH

      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 B1620/21 is output.

      Tech Tips

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

    8. Connect the connectors to the rear airbag sensor RH.


    NG

    REPLACE REAR AIRBAG SENSOR RH

    OK

  10. CHECK SIDE AIRBAG SENSOR RH


    1. A01E0LVE04
      Text in illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor Assembly

      Interchange the side airbag sensor RH with LH 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 B1620/21 and B1625/22 are not output A
      DTC B1625/22 is output B
      DTC B1620/21 is output C

      Tech Tips

      Codes other than DTC 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, 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

    B

    REPLACE SIDE AIRBAG SENSOR RH

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

  11. 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 LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  12. CHECK CONNECTORS


    1. A01DVK7E02
      Text in illustration
      *1 Side Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire

      Disconnect the connectors from the center airbag sensor and side airbag sensor LH.

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  13. CHECK SIDE AIRBAG SENSOR LH CIRCUIT


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

      A01DXFME09
      Text in illustration
      *1 Side Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Rear view of wire harness connector:

      (to Side Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector:

      (to Center Airbag Sensor Assembly)

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F25-3 (BBL-) - Body ground Ignition switch ON Below 1 V
      F25-4 (BBL+) - Body ground

    4. Turn the ignition switch off.

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

    6. Using a service wire, connect terminals 8 (BBD+) and 15 (BBD-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F25-3 (BBL-) - F25-4 (BBL+) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F25-3 (BBL-) - F25-4 (BBL+) Always 1 MΩ or higher
      F25-3 (BBL-) - Body ground
      F25-4 (BBL+) - Body ground

    NG

    REPLACE FLOOR WIRE

    OK

  14. CHECK SIDE AIRBAG SENSOR LH


    1. A01E0LVE05
      Text in illustration
      *1 Side Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

      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 B1620/21 and B1625/22 are not output A
      DTC B1625/22 is output B
      DTC B1620/21 is output C

      Tech Tips

      Codes other than DTC B1620/21 and B1625/22 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 RH and LH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE SIDE AIRBAG SENSOR LH

    C

  15. CHECK CONNECTION OF CONNECTORS


    1. Check that the connector are properly connected to the rear airbag sensor LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  16. CHECK CONNECTORS


    1. A01DYYOE03
      Text in illustration
      *1 Rear Airbag Sensor LH
      *2 Floor Wire
      *3 Side Airbag Sensor LH

      Disconnect the connectors from the side airbag sensor LH and rear airbag sensor LH.

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  17. CHECK REAR AIRBAG SENSOR LH CIRCUIT


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

      A01DZQWE02
      Text in illustration
      *1 Rear Airbag Sensor LH *2 Side Airbag Sensor LH
      *3 Connector C *4 Connector B
      *5 Service Wire *6 Floor Wire
      *a

      Rear view of wire harness connector:

      (to Rear Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector:

      (to Side Airbag Sensor LH)

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R14-2 (BCL+) - Body ground Ignition switch ON Below 1 V
      R14-1 (BCL-) - Body ground

    4. Turn the ignition switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R14-2 (BCL+) - R14-1 (BCL-) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R14-2 (BCL+) - R14-1 (BCL-) Always 1 MΩ or higher
      R14-2 (BCL+) - Body ground
      R14-1 (BCL-) - Body ground

    NG

    REPLACE FLOOR WIRE

    OK

  18. CHECK DTC


    1. A01E0TVE01
      Text in illustration
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor LH

      Connect the connectors to the side airbag sensor LH.

    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 B1620/21 is output.

      Tech Tips

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

    8. Connect the connectors to the rear airbag sensor LH.


    NG

    REPLACE REAR AIRBAG SENSOR LH

    OK

  19. CHECK SIDE AIRBAG SENSOR LH


    1. A01E0LVE05
      Text in illustration
      *1 Side Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

      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 B1620/21 and B1625/22 are not output A
      DTC B1625/22 is output B
      DTC B1620/21 is output C

      Tech Tips

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

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


    A

    USE SIMULATION METHOD TO CHECK

    B

    REPLACE SIDE AIRBAG SENSOR LH

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY