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 or RH (to determine deployment of the front seat airbag LH or RH, rear seat airbag LH or RH, front seat belt pretensioner LH or RH, rear seat belt pretensioner LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor assembly, rear airbag sensor LH or RH and side airbag sensor assembly LH or RH.

The side airbag sensor assembly LH or RH and rear airbag sensor LH or 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 satellite sensor bus LH or RH (to determine deployment of the front seat airbag LH or RH, rear seat airbag LH or RH, front seat belt pretensioner LH or RH, rear seat belt pretensioner LH or RH and curtain shield airbag LH or 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 satellite sensor bus RH for 2 seconds.

  • A side airbag sensor assembly RH malfunction.

  • A rear airbag sensor RH malfunction.

  • A center airbag sensor assembly malfunction.

  • 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 satellite sensor bus LH for 2 seconds.

  • A side airbag sensor assembly LH malfunction.

  • A rear airbag sensor LH malfunction.

  • A center airbag sensor assembly malfunction.

  • No. 2 floor wire

  • Side airbag sensor assembly LH

  • Rear airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01FVZ3E10
A01FVZ3E11

INSPECTION PROCEDURE

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.

  • When disconnecting the cable from the negative (-) auxiliary 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 power switch off.

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

    3. Check for DTCs Click here.

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    CHECK CONNECTION OF CONNECTORS Click here

    C

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary 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 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 rear airbag sensor RH.

    2. A01FQVIE03
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor Assembly
      *3 Floor Wire

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK REAR AIRBAG SENSOR RH CIRCUIT


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

      A01FR16E04
      Text in Illustration
      *1 Rear Airbag Sensor RH *2 Center Airbag Sensor Assembly
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T7-4 (BCR+) - Body ground Power switch on (IG) Below 1 V
      T7-3 (BCR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

    6. Using a service wire, connect terminals 24 (BBR+) and 23 (BBR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T7-4 (BCR+) - T7-3 (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
      T7-4 (BCR+) - T7-3 (BCR-) Always 1 MΩ or higher
      T7-4 (BCR+) - Body ground Always 1 MΩ or higher
      T7-3 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK CONNECTION OF CONNECTOR


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

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  6. CHECK CONNECTORS


    1. Disconnect the connector from the side airbag sensor assembly RH.

    2. A01FUDDE03
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Floor Wire

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

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH CIRCUIT


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

      A01FVLUE01
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH *2 Rear Airbag Sensor RH
      *3 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly RH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      T7-1 (BBR+) - Body ground Power switch on (IG) Below 1 V
      T7-2 (BBR-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T7-1 (BBR+) - T7-2 (BBR-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T7-1 (BBR+) - T7-2 (BBR-) Always 1 MΩ or higher
      T7-1 (BBR+) - Body ground Always 1 MΩ or higher
      T7-2 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  8. CHECK REAR AIRBAG SENSOR RH


    1. A01FSONE37
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor Assembly

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

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

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

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

    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 90 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642/81 and B1647/82 are not output A
      DTC B1647/82 is output B
      DTC B1642/81 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 power switch off.

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

    11. Return the rear 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 REAR AIRBAG SENSOR RH Click here

    C

  9. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH


    1. A01FQR4E16
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH

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

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

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

    4. Clear the DTCs stored in memory Click here.

    5. Turn the power switch off.

    6. Turn the power switch on (IG), and wait for at least 90 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 B
      DTC B1642/81 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 power switch off.

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

    10. Return the side airbag sensor assembly 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

  10. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

    2. Disconnect the cable from the negative (-) auxiliary 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. Disconnect the connectors from the center airbag sensor assembly and rear airbag sensor LH.

    2. A01FU6WE05
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  12. CHECK REAR AIRBAG SENSOR LH CIRCUIT


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

      A01FU9ME04
      Text in Illustration
      *1 Rear Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

      		 *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U9-4 (BCL+) - Body ground Power switch on (IG) Below 1 V
      U9-3 (BCL-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

    6. Using a service wire, connect terminals 17 (BBL+) and 18 (BBL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-4 (BCL+) - U9-3 (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
      U9-4 (BCL+) - U9-3 (BCL-) Always 1 MΩ or higher
      U9-4 (BCL+) - Body ground Always 1 MΩ or higher
      U9-3 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  13. CHECK CONNECTION OF CONNECTOR


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

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  14. CHECK CONNECTORS


    1. Disconnect the connector from the side airbag sensor assembly LH.

    2. A01FUDDE04
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor LH
      *3 No. 2 Floor Wire

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

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  15. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT


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

      A01FVLUE02
      Text in Illustration
      *1 Side Airbag Sensor Assembly LH *2 Rear Airbag Sensor LH
      *3 No. 2 Floor Wire *4 Connector C
      *5 Connector B *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly LH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      U9-1 (BBL+) - Body ground Power switch on (IG) Below 1 V
      U9-2 (BBL-) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

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

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-1 (BBL+) - U9-2 (BBL-) Always Below 1 Ω

    8. Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      U9-1 (BBL+) - U9-2 (BBL-) Always 1 MΩ or higher
      U9-1 (BBL+) - Body ground Always 1 MΩ or higher
      U9-2 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  16. CHECK REAR AIRBAG SENSOR LH


    1. A01FUHQE03
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

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

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

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

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

    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 90 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 power switch off.

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

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

  17. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH


    1. A01FQR4E16
      Text in Illustration
      *1 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor LH

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

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

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

    4. Clear the DTCs stored in memory Click here.

    5. Turn the power switch off.

    6. Turn the power switch on (IG), and wait for at least 90 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 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 power switch off.

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

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here