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 side airbag LH or RH and curtain shield airbag LH or RH) is composed of the center airbag sensor assembly, side airbag sensor assembly LH or RH and rear airbag sensor 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 recorded when a malfunction is detected in the circuit for the side satellite sensor bus LH or RH (to determine deployment of the front and rear seat side airbag LH or RH and curtain shield airbag LH or RH).

DTC Code Detection Condition Trouble Area
B1642/81

One of the 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 side satellite sensor bus RH (to determine deployment of the front and rear seat side airbag RH and curtain shield airbag RH) for 2 seconds.

  • Rear airbag sensor RH malfunction

  • Side airbag sensor assembly RH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Rear airbag sensor RH

  • Side airbag sensor assembly RH

  • Center airbag sensor assembly
B1647/82

One of the 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 side satellite sensor bus LH (to determine deployment of the front and rear seat side airbag LH and curtain shield airbag LH) for 2 seconds.

  • Rear airbag sensor LH malfunction

  • Side airbag sensor assembly LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Rear airbag sensor LH

  • Side airbag sensor assembly LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01H0H0E64
A01H0H0E65

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 ON (IG), and wait for at least 60 seconds.

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

    3. Turn the power switch OFF.

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

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

    3. Check that the connectors are properly connected to the center airbag sensor assembly, the rear airbag sensor RH 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, rear airbag sensor RH and side airbag sensor assembly RH.

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - REAR AIRBAG SENSOR RH)

    A01GYUYE08

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

    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
      R91-4 (BCR+) - Body ground Power switch ON (IG) Below 1 V
      R91-3 (BCR-) - Body ground Power switch ON (IG) Below 1 V

    4. Turn the power switch OFF.

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

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

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

      Note

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

      Standard resistance
      Tester Connection Condition Specified Condition
      R91-4 (BCR+) - R91-3 (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
      R91-4 (BCR+) - R91-3 (BCR-) Always 1 MΩ or higher
      R91-4 (BCR+) - Body ground Always 1 MΩ or higher
      R91-3 (BCR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK REAR AIRBAG SENSOR RH

    A01H033E36

    1. Connect the connector to the center airbag sensor assembly.

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

    3. Connect the negative (-) terminal to the auxiliary battery, 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 the memory Click here.

    6. Turn the power switch OFF.

    7. Turn the power switch ON (IG), 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 B1647/82 is output B
      DTC B1642/81 is output C

    9. Turn the power switch OFF.

    10. Disconnect the negative (-) terminal cable from the auxiliary battery, 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

  6. CHECK FLOOR WIRE (REAR AIRBAG SENSOR RH - SIDE AIRBAG SENSOR ASSEMBLY RH)

    A01GX1RE38

    1. Disconnect the connector from the rear airbag sensor RH.

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

    3. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified Condition
      R91-1 (BBR+) - Body ground Power switch ON (IG) Below 1 V
      R91-2 (BBR-) - Body ground Power switch ON (IG) Below 1 V

    5. Turn the power switch OFF.

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

    7. Using a service wire, connect terminals 2 (BBR+) and 1 (BBR-) 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
      Tester Connection Condition Specified Condition
      R91-1 (BBR+) - R91-2 (BBR-) Always Below 1 Ω

    9. Disconnect the service wire from the connector C.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      R91-1 (BBR+) - R91-2 (BBR-) Always 1 MΩ or higher
      R91-1 (BBR+) - Body ground Always 1 MΩ or higher
      R91-2 (BBR-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  7. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

    A01GY6CE22

    1. Connect the connector to the rear airbag sensor RH.

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

    3. Connect the negative (-) terminal to the auxiliary battery, 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 the memory Click here.

    6. Turn the power switch OFF.

    7. Turn the power switch ON (IG), 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 B1647/82 is output B
      DTC B1642/81 is output C

      Tech Tips

      Codes other than past 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 negative (-) terminal cable from the auxiliary battery, 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.


    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

  8. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch OFF.

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

    3. Check that the connectors are properly connected to the center airbag sensor assembly, the rear airbag sensor LH and side airbag sensor assembly LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  9. CHECK CONNECTORS


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

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

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  10. CHECK NO. 2 FLOOR WIRE (CENTER AIRBAG SENSOR ASSEMBLY - REAR AIRBAG SENSOR LH)

    A01GXNQE13

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

    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
      S99-4 (BCL+) - Body ground Power switch ON (IG) Below 1 V
      S99-3 (BCL-) - Body ground Power switch ON (IG) Below 1 V

    4. Turn the power switch OFF.

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

    6. Using the service wire, connect terminals 24 (BBL+) and 23 (BBL-) 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
      S99-4 (BCL+) - S99-3 (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
      S99-4 (BCL+) - S99-3 (BCL-) Always 1 MΩ or higher
      S99-4 (BCL+) - Body ground Always 1 MΩ or higher
      S99-3 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  11. CHECK REAR AIRBAG SENSOR LH

    A01GW2OE58

    1. Connect the connector to the center airbag sensor assembly

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

    3. Connect the negative (-) terminal to the auxiliary battery, 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 the memory Click here.

    6. Turn the power switch OFF.

    7. Turn the power switch ON (IG), 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 past 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 negative (-) terminal cable from the auxiliary battery, 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

  12. CHECK NO. 2 FLOOR WIRE (REAR AIRBAG SENSOR LH - SIDE AIRBAG SENSOR ASSEMBLY LH)

    A01GX1RE39

    1. Disconnect the connector from the rear airbag sensor LH.

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

    3. Turn the power switch ON (IG).

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

      Standard voltage
      Tester Connection Switch Condition Specified condition
      S99-1 (BBL+) - Body ground Power switch ON (IG) Below 1 V
      S99-2 (BBL-) - Body ground Power switch ON (IG) Below 1 V

    5. Turn the power switch OFF.

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

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

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

      Note

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

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S99-1 (BBL+) - S99-2 (BBL-) Always Below 1 Ω

    10. Disconnect the service wire from the connector C.

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

      Standard resistance
      Tester Connection Condition Specified Condition
      S99-1 (BBL+) - S99-2 (BBL-) Always 1 MΩ or higher
      S99-1 (BBL+) - Body ground Always 1 MΩ or higher
      S99-2 (BBL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  13. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

    A01GY6CE23

    1. Connect the connector to the rear airbag sensor LH.

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

    3. Connect the negative (-) terminal to the auxiliary battery, 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 the memory Click here.

    6. Turn the power switch OFF.

    7. Turn the power switch ON (IG), 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 past 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 negative (-) terminal cable from the auxiliary battery, 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 SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here