AIRBAG SYSTEM, Diagnostic DTC:B1643/81, B1648/82

DTC Code DTC Name
B1643/81 Side Satellite Sensor Bus RH Initialization Incomplete
B1648/82 Side Satellite Sensor Bus LH Initialization Incomplete

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, rear airbag sensor LH or RH, and side airbag sensor assembly LH or RH.

The rear airbag sensor LH or RH and side airbag sensor assembly 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 B1643/81 or B1648/82 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, curtain shield airbag LH or RH and rear seat cushion squib).

DTC Code Detection Condition Trouble Area
B1643/81

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, curtain shield airbag RH and rear seat cushion squib 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
B1648/82

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, curtain shield airbag LH and rear seat cushion squib 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 PAST DTC


    1. Check the past DTCs Click here.

      Result
      Result Proceed to
      DTC B1622/81 or B1627/82 is output A
      DTC B1622/81 and B1627/82 are not output B

    A

    GO TO DTC B1622/81 Click here

    B

  2. CHECK FOR DTC


    1. Turn the power switch OFF.

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

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

    4. Turn the power switch OFF.

    5. Turn the power switch ON (IG), and wait for at least 90 seconds.

    6. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTC B1643/81 and B1648/82 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

  3. 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 and rear airbag sensor RH.

      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 rear airbag sensor RH.

    2. 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

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

    A01GYUYE09

    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 a service wire, connect terminals 17 (BBR+) and 18 (BBR-) 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
      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

  6. 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 CONNECTOR PROPERLY

    OK

  7. CHECK CONNECTOR


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

    2. 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

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

    A01GX1RE40

    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
      R91-1 (BBR+) - Body ground Power switch ON (IG) Below 1 V
      R91-2 (BBR-) - 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 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.

    7. 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

    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
      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

  9. 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 cable 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 90 seconds.

    8. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTC B1643/81 and B1648/82 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 position and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR RH Click here

    C

  10. CHECK SIDE AIRBAG SENSOR ASSEMBLY RH

    A01GY6CE22

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

    2. Connect the negative (-) terminal cable to the auxiliary battery, 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 the 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 B1648/82 is output A
      DTC B1643/81 is output B
      DTC B1643/81 and B1648/82 are not output C

      Tech Tips

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

    8. Turn the power switch OFF.

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

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


    A

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    B

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

  11. 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 and rear airbag sensor LH.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  12. CHECK CONNECTORS


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

    2. 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

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

    A01GXNQE14

    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 a 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

  14. 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 CONNECTOR PROPERLY

    OK

  15. CHECK CONNECTOR


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

    2. 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

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

    A01GX1RE41

    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
      S99-1 (BBL+) - Body ground Power switch ON (IG) Below 1 V
      S99-2 (BBL-) - 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 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.

    7. 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

    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
      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

  17. 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 cable 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 90 seconds.

    8. Check for DTCs Click here.

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

      Tech Tips

      Codes other than DTC B1623, B1628, B1643/81 and B1648/82 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 position and connect the connectors to them.


    A

    REPLACE REAR AIRBAG SENSOR LH Click here

    B

    USE SIMULATION METHOD TO CHECK Click here

    C

  18. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH

    A01GY6CE23

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

    2. Connect the negative (-) terminal cable to the auxiliary battery, 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 the 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 B1648/82 is output A
      DTC B1643/81 is output B
      DTC B1643/81 and B1648/82 are not output C

      Tech Tips

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

    8. Turn the power switch OFF.

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

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


    A

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here