AIRBAG SYSTEM, Diagnostic DTC:B1642/81, B1643/81

DTC Code DTC Name
B1642/81 Lost Communication with Driver Side Satellite Sensor Bus
B1643/81 Driver Side Satellite Sensor Bus Initialization Incomplete

DESCRIPTION

The circuit for the driver side - side collision sensor and driver side rear collision sensor (to determine deployment of the front seat side airbag (driver side), curtain shield airbag (driver side), SRS seat cushion airbag and rear window curtain shield airbag) is composed of the center airbag sensor assembly, driver side - side airbag sensor (for front side), driver side - side airbag sensor (for rear side) and driver side rear airbag sensor.

The driver side - side airbag sensor (for front side), driver side - side airbag sensor (for rear side) and driver side rear airbag sensor 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 B1643/81 is recorded when a malfunction is detected in the circuit for the driver side - side collision sensor and driver side rear collision sensor (to determine deployment of the front seat side airbag (driver side), curtain shield airbag (driver side), SRS seat cushion airbag and rear window curtain shield airbag).

DTC No. DTC Detection Condition Trouble Area

B1642/81

B1643/81

When one of following conditions is met:


  • The center airbag sensor assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the driver side - side collision sensor and driver side rear collision sensor (to determine deployment of the front seat side airbag (driver side), curtain shield airbag (driver side), SRS seat cushion airbag and rear window curtain shield airbag) for 2 seconds.

  • Driver side - side airbag sensor (for front side) malfunction

  • Driver side - side airbag sensor (for rear side) malfunction

  • Driver side rear airbag sensor malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front door wire (driver side)

  • Driver side - side airbag sensor (for front side)

  • Driver side - side airbag sensor (for rear side)

  • Driver side rear airbag sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A0119GWE01
A0119GWE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the ignition switch off.

    2. Clear the DTCs stored in the memory Click here.

    3. Turn the ignition switch off.

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

    5. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642/81 and B1643/81 are not output A
      DTC B1642/81 is output B
      DTC B1643/81 is output C

    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    CHECK CONNECTION OF CONNECTORS Click here

    C

  2. CHECK PAST DTC


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

    2. Turn the ignition switch off.

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

    4. Check the past DTCs Click here.

      Result
      Result Proceed to
      DTC B1634/81 is output A
      DTC B1644/82 is output B
      DTC B1692/81 is output C
      DTC B1697/82 is output D
      DTC B1634/81, B1644/82, 1692/81 and B1697/82 are not output E

    A

    GO TO DTC B1634/81 Click here

    B

    GO TO DTC B1644/82 Click here

    C

    GO TO DTC B1692/81 Click here

    D

    GO TO DTC B1697/82 Click here

    E

  3. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the center airbag sensor assembly and driver side - side airbag sensor (for front side).

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  4. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor assembly and driver side - side airbag sensor (for front side).

    2. Check that the connectors (on the center airbag sensor assembly side and driver side - side airbag sensor (for front side) side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR (FOR FRONT SIDE) CIRCUIT (CENTER AIRBAG SENSOR - SIDE AIRBAG SENSOR (FOR FRONT SIDE))

    A0118HYE01
    Text in Illustration
    *1 for LHD *6 Center Airbag Sensor Assembly
    *2 for RHD *7 Connector E
    *3

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Front Side))

    		 *8 Connector B
    *4

    Rear view of wire harness connector

    (to Center Airbag Sensor Assembly)

    		 *9 Service Wire
    *5 Driver Side - Side Airbag Sensor (for Front Side) - -

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      F8-4 (BBL+) - Body ground Ignition switch ON Below 1 V
      F8-3 (BBL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      E8-4 (BBR+) - Body ground Ignition switch ON Below 1 V
      E8-3 (BBR-) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the negative (-) terminal cable from the battery, 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 LHD
      Tester Connection Condition Specified Condition
      F8-4 (BBL+) - F8-3 (BBL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      E8-4 (BBR+) - E8-3 (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 LHD
      Tester Connection Condition Specified Condition
      F8-4 (BBL+) - F8-3 (BBL-) Always 1 MΩ or higher
      F8-4 (BBL+) - Body ground Always 1 MΩ or higher
      F8-3 (BBL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      E8-4 (BBR+) - E8-3 (BBR-) Always 1 MΩ or higher
      E8-4 (BBR+) - Body ground Always 1 MΩ or higher
      E8-3 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE (DRIVER SIDE)) Click here

    OK

  6. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR (FOR REAR SIDE) CIRCUIT

    A0119P8E01
    Text in Illustration
    *1 for LHD *6 Driver Side - Side Airbag Sensor (for Rear Side)
    *2 for RHD *7 Connector E
    *3

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Front Side))

    		 *8 Connector B
    *4

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Rear Side))

    		 *9 Service Wire
    *5 Driver Side - Side Airbag Sensor (for Front Side) - -

    1. Disconnect the connectors from the driver side - side airbag sensor (for front side) and driver side - side airbag sensor (for rear side).

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      G17-4 (BCL+) - Body ground Ignition switch ON Below 1 V
      G17-3 (BCL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      G16-4 (BCR+) - Body ground Ignition switch ON Below 1 V
      G16-3 (BCR-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. Using a service wire, connect terminals 1 and 2 of connector E.

      Note

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

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-4 (BCL+) - G17-3 (BCL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G16-4 (BCR+) - G16-3 (BCR-) Always Below 1 Ω

    9. Disconnect the service wire from connector E.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-4 (BCL+) - G17-3 (BCL-) Always 1 MΩ or higher
      G17-4 (BCL+) - Body ground Always 1 MΩ or higher
      G17-3 (BCL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G16-4 (BCR+) - G16-3 (BCR-) Always 1 MΩ or higher
      G16-4 (BCR+) - Body ground Always 1 MΩ or higher
      G16-3 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (SIDE AIRBAG SENSOR (FOR REAR SIDE) - FRONT DOOR WIRE) Click here

    OK

  7. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR (FOR REAR SIDE) - REAR AIRBAG SENSOR)

    A011B2JE01
    Text in Illustration
    *1 for LHD *6 Driver Side - Side Airbag Sensor (for Rear Side)
    *2 for RHD *7 Floor Wire
    *3

    Front view of wire harness connector

    (to Driver Side Rear Airbag Sensor)

    		 *8 Connector C
    *4

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Rear Side))

    		 *9 Connector B
    *5 Driver Side Rear Airbag Sensor *10 Service Wire

    1. Disconnect the connectors from the driver side - side airbag sensor (for rear side) and driver side rear airbag sensor.

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      G17-1 (BEL+) - Body ground Ignition switch ON Below 1 V
      G17-2 (BEL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      G16-1 (BER+) - Body ground Ignition switch ON Below 1 V
      G16-2 (BER-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. Using a service wire, connect terminals 2 and 1 of connector C.

      Note

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

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-1 (BEL+) - G17-2 (BEL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      G16-1 (BER+) - G16-2 (BER-) Always Below 1 Ω

    9. Disconnect the service wire from connector C.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      G17-1 (BEL+) - G17-2 (BEL-) Always 1 MΩ or higher
      G17-1 (BEL+) - Body ground Always 1 MΩ or higher
      G17-2 (BEL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      G16-1 (BER+) - G16-2 (BER-) Always 1 MΩ or higher
      G16-1 (BER+) - Body ground Always 1 MΩ or higher
      G16-2 (BER-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  8. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR (FOR FRONT SIDE)


    1. A0117M4E01
      Text in Illustration
      *1 Passenger Side - Side Airbag Sensor (for Front Side)
      *2 Center Airbag Sensor Assembly

      Interchange the passenger side - side airbag sensor (for front side) with the driver side - side airbag sensor (for front side) and connect the connectors to them.

    2. Connect the negative (-) terminal cable to the battery, 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 90 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1647/82 or B1648/82 is output A
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output B
      DTC B1642/81 or B1643/81 is output C

    A

    REPLACE DRIVER SIDE - SIDE AIRBAG SENSOR (FOR FRONT SIDE) Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

    C

  9. CHECK DRIVER SIDE - SIDE AIRBAG SENSOR (FOR REAR SIDE)

    A0118YEE01
    Text in Illustration
    *1 Passenger Side - Side Airbag Sensor (for Rear Side)
    *2 Driver Side - Side Airbag Sensor (for Front Side)

    1. Interchange the passenger side - side airbag sensor (for rear side) with driver side - side airbag sensor (for rear side) and connect the connectors to them.

    2. Connect the negative (-) terminal cable to the battery, 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 90 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1647/82 or B1648/82 is output A
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output B
      DTC B1642/81 or B1643/81 is output C

    A

    REPLACE DRIVER SIDE - SIDE AIRBAG SENSOR (FOR REAR SIDE) Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

    C

  10. CHECK DRIVER SIDE REAR AIRBAG SENSOR

    A0117TGE13
    Text in Illustration
    *1 Passenger Side Rear Airbag Sensor
    *2 Driver Side - Side Airbag Sensor (for Rear Side)

    1. Interchange the passenger side rear airbag sensor with driver side rear airbag sensor and connect the connectors to them.

    2. Connect the negative (-) terminal cable to the battery, 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 90 seconds.

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642/81 or B1643/81 is output A
      DTC B1647/82 or B1648/82 is output B
      DTC B1642/81, B1643/81, B1647/82 and B1648/82 are not output C

      Tech Tips

      DTCs other than B1642/81, B1643/81, B1647/82 and B1648/82 may be output at this time, but they are not related to this check.


    A

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE DRIVER SIDE REAR AIRBAG SENSOR Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  11. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR - FRONT DOOR WIRE (DRIVER SIDE))

    A011B3GE01
    Text in Illustration
    *1 for LHD *7 Front Door Wire (Driver Side)
    *2 for RHD *8 Floor Wire
    *3

    Front view of wire harness connector

    (to Front Door Wire (Driver Side))

    		 *9 Connector C
    *4

    Rear view of wire harness connector

    (to Center Airbag Sensor Assembly)

    		 *10 Connector B
    *5 Driver Side - Side Airbag Sensor (for Front Side) *11 Service Wire
    *6 Center Airbag Sensor Assembly - -

    1. Disconnect the floor wire connector from the front door wire (driver side).

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      FG1-1 (BBL+) - Body ground Ignition switch ON Below 1 V
      FG1-2 (BBL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      EG1-1 (BBR+) - Body ground Ignition switch ON Below 1 V
      EG1-2 (BBR-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. 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.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      FG1-1 (BBL+) - FG1-2 (BBL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      EG1-1 (BBR+) - EG1-2 (BBR-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      FG1-1 (BBL+) - FG1-2 (BBL-) Always 1 MΩ or higher
      FG1-1 (BBL+) - Body ground Always 1 MΩ or higher
      FG1-2 (BBL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      EG1-1 (BBR+) - EG1-2 (BBR-) Always 1 MΩ or higher
      EG1-1 (BBR+) - Body ground Always 1 MΩ or higher
      EG1-2 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT DOOR WIRE (DRIVER SIDE)

  12. CHECK FLOOR WIRE (SIDE AIRBAG SENSOR (FOR REAR SIDE) - FRONT DOOR WIRE)

    A0119PVE01
    Text in Illustration
    *1 for LHD *7 Front Door Wire (Driver Side)
    *2 for RHD *8 Floor Wire
    *3

    Front view of wire harness connector

    (to Front Door Wire (Driver Side))

    		 *9 Connector C
    *4

    Rear view of wire harness connector

    (to Driver Side - Side Airbag Sensor (for Rear Side))

    		 *10 Connector B
    *5 Driver Side - Side Airbag Sensor (for Front Side) *11 Service Wire
    *6 Driver Side - Side Airbag Sensor (for Rear Side) - -

    1. Disconnect the floor wire connector from the front door wire (driver side).

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      FG1-3 (BCL+) - Body ground Ignition switch ON Below 1 V
      FG1-4 (BCL-) - Body ground Ignition switch ON Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      EG1-3 (BCR+) - Body ground Ignition switch ON Below 1 V
      EG1-4 (BCR-) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

    7. Using a service wire, connect terminals 3 and 4 of connector B.

      Note

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

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      FG1-3 (BCL+) - FG1-4 (BCL-) Always Below 1 Ω
      for RHD
      Tester Connection Condition Specified Condition
      EG1-3 (BCR+) - EG1-4 (BCR-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      for LHD
      Tester Connection Condition Specified Condition
      FG1-3 (BCL+) - FG1-4 (BCL-) Always 1 MΩ or higher
      FG1-3 (BCL+) - Body ground Always 1 MΩ or higher
      FG1-4 (BCL-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Condition Specified Condition
      EG1-3 (BCR+) - EG1-4 (BCR-) Always 1 MΩ or higher
      EG1-3 (BCR+) - Body ground Always 1 MΩ or higher
      EG1-4 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT DOOR WIRE (DRIVER SIDE)