AIRBAG SYSTEM, Diagnostic DTC:B1642/81, B1647/82

DTC Code DTC Name
B1642/81 Lost Communication with Side Satellite Sensor Bus RH
B1647/82 Lost Communication with Side Satellite Sensor Bus LH

DESCRIPTION

The circuit for the side collision sensor LH/RH (to determine deployment of the front seat side airbag assembly LH/RH and curtain shield airbag assembly LH/RH) is composed of the center airbag sensor assembly, rear airbag sensor LH/RH and side airbag sensor assembly LH/RH.

The side airbag sensor assembly LH/RH and rear airbag sensor LH/RH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.

DTC B1642/81 or B1647/82 is stored when a malfunction is detected in the circuit for the side collision sensor LH/RH (to determine deployment of the front seat side airbag LH/RH and curtain shield airbag LH/RH).

DTC Code DTC Detection Condition Trouble Area
B1642/81

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor RH (to determine deployment of the front seat side airbag assembly RH and curtain shield airbag assembly RH) for 2 seconds.

  • A side airbag sensor assembly RH malfunction.

  • A rear airbag sensor RH malfunction.

  • A center airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Side airbag sensor assembly RH

  • Rear airbag sensor RH

  • Center airbag sensor assembly
B1647/82

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor LH (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) for 2 seconds.

  • A side airbag sensor assembly LH malfunction.

  • A rear airbag sensor LH malfunction.

  • A center airbag sensor assembly malfunction.

  • Floor wire

  • Side airbag sensor assembly LH

  • Rear airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A00ON0CE07
A00ON0CE08

INSPECTION PROCEDURE

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 FOR DTC


    1. Turn the ignition switch off.

      Tech Tips

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. The malfunctioning area can be identified by turning the ignition switch off and then to ON again.

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

    3. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642/81 is output A
      DTC B1647/82 is output B
      DTC B1642/81 and B1647/82 are not output C

      Tech Tips

      Codes other than DTC B1642/81 and B1647/82 may be output at this time, but they are not related to this check.


    B

    CHECK CONNECTION OF CONNECTORS Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  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 assembly and side airbag sensor assembly RH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


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

    2. A00OLRGE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH
      *2 Center Airbag Sensor Assembly

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK NO. 2 FLOOR WIRE


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

      A00OK9JE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Rear view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

    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 Ignition switch ON Below 1 V

    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 Always 1 MΩ or higher
      H6-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  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 CONNECTORS


    1. A00OJU6E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH

      Disconnect the connector from the 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


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

      A00OIN2E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH *2 Rear Airbag Sensor RH
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Rear view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      		 *b

      Rear view of wire harness connector

      (to Rear Airbag Sensor RH)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      H6-1 (BCR+) - Body ground Ignition switch ON Below 1 V
      H6-2 (BCR-) - Body ground Ignition switch ON Below 1 V

    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 2 (BCR+) and 1 (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
      H6-1 (BCR+) - H6-2 (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
      H6-1 (BCR+) - H6-2 (BCR-) Always 1 MΩ or higher
      H6-1 (BCR+) - Body ground Always 1 MΩ or higher
      H6-2 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  8. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. A00ON7TE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the center airbag sensor assembly and rear airbag sensor RH.

    2. Interchange the side airbag sensor assembly 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 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 B1642/81 is output A
      DTC B1647/82 is output B
      DTC B1642/81 and B1647/82 are not output C

      Tech Tips

      Codes other than DTC B1642/81 and B1647/82 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 assembly LH and RH to their original positions and connect the connectors to them.


    B

    REPLACE SIDE AIR BAG SENSOR ASSEMBLY RH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  9. CHECK REAR AIRBAG SENSOR RH


    1. A00OHY2E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor LH

      Interchange the rear 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 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 B1642/81 and B1647/82 are not output A
      DTC B1647/82 is output (for Sedan) B
      DTC B1647/82 is output (for Wagon) C
      DTC B1642/81 is output D

      Tech Tips

      Codes other than DTC B1642/81 and B1647/82 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 rear airbag sensor LH and RH to their original positions and connect the connectors to them.


    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

    REPLACE REAR AIRBAG SENSOR RH Click here

    D

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  10. 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 assembly and rear airbag sensor LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  11. CHECK CONNECTORS


    1. A00OLZ7E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Center Airbag Sensor Assembly

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

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  12. CHECK FLOOR WIRE


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

      A00OHWRE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly 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 Assembly LH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G8-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      G8-3 (BBL-) - Body ground Ignition switch ON Below 1 V

    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 (BBL+) and 15 (BBL-) 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
      G8-4 (BBL+) - G8-3 (BBL-) 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
      G8-4 (BBL+) - G8-3 (BBL-) Always 1 MΩ or higher
      G8-4 (BBL+) - Body ground Always 1 MΩ or higher
      G8-3 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  13. CHECK CONNECTION OF CONNECTOR


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

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTOR PROPERLY

    OK

  14. CHECK CONNECTORS


    1. A00OJU6E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor LH

      Disconnect the connector from the rear airbag sensor LH.

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

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  15. CHECK FLOOR WIRE


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

      A00OIN2E02
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH *2 Rear Airbag Sensor LH
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Rear view of wire harness connector

      (to Side Airbag Sensor Assembly LH)

      		 *b

      Rear view of wire harness connector

      (to Rear Airbag Sensor LH)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G8-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      G8-2 (BCL-) - Body ground Ignition switch ON Below 1 V

    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 2 (BCL+) and 1 (BCL-) 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
      G8-1 (BCL+) - G8-2 (BCL-) 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
      G8-1 (BCL+) - G8-2 (BCL-) Always 1 MΩ or higher
      G8-1 (BCL+) - Body ground Always 1 MΩ or higher
      G8-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  16. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH


    1. A00ONCKE01
      Text in Illustration
      *1 Side Airbag Sensor Sensor RH
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the center airbag sensor assembly and rear airbag sensor LH.

    2. Interchange the side airbag sensor assembly 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 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 B1642/81 and B1647/82 are not output A
      DTC B1642/81 is output B
      DTC B1647/82 is output C

      Tech Tips

      Codes other than DTC B1642/81 and B1647/82 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 assembly RH and LH to their original positions and connect the connectors to them.


    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  17. CHECK REAR AIRBAG SENSOR LH


    1. A00OHY2E01
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH

      Interchange the rear 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 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 B1642/81 and B1647/82 are not output A
      DTC B1642/81 is output (for Sedan) B
      DTC B1642/81 is output (for Wagon) B
      DTC B1647/82 is output C

      Tech Tips

      Codes other than DTC B1642/81 and B1647/82 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 rear airbag sensor RH and LH to their original positions and connect the connectors to them.


    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    REPLACE REAR AIRBAG SENSOR LH Click here

    D

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    A

    USE SIMULATION METHOD TO CHECK Click here