AIRBAG SYSTEM, Diagnostic DTC:B1647/82

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

DESCRIPTION

The side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) is composed of the airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.

The door side airbag sensor LH and No. 2 side airbag sensor assembly LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbag should be deployed.

This DTC is stored when a malfunction is detected for the side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

DTC No. DTC Detection Condition Trouble Area
B1647/82

Any of the following conditions is met:


  • The 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 side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

  • Door side airbag sensor LH malfunction

  • No. 2 side airbag sensor assembly LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Door side airbag sensor LH

  • No. 2 side airbag sensor assembly LH

  • Airbag sensor assembly

WIRING DIAGRAM

Click here

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.

    5. Check that the terminals of connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK FLOOR WIRE (OPEN)


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

      A004EJ2E03
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly LH *2 Airbag Sensor Assembly
      *3 Floor Wire *4 Connector B
      *5 Connector C *6 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)

      		 *b

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-3 (BCL-) - K40-4 (BCL+) Always Below 1 Ω

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (SHORT)


    1. A004ER2E05
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-3 (BCL-) - K40-4 (BCL+) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (SHORT TO B+)


    1. A004ER2E06
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Connect the cable to the negative (-) auxiliary battery terminal.

    2. Turn the ignition switch to ON (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K40-3 (BCL-) - Body ground Ignition switch ON (IG) Below 1 V
      K40-4 (BCL+) - Body ground Ignition switch ON (IG) Below 1 V

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A004ER2E07
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag Sensor Assembly
      *3 Floor Wire
      *4 Connector C
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Turn the ignition switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-3 (BCL-) - Body ground Always 1 MΩ or higher
      K40-4 (BCL+) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (OPEN)


    1. Using the service wire, connect terminals 2 (BDL+) and 1 (BDL-) of connector E.

      A004FP6E01
      Text in Illustration
      *1 Door Side Airbag Sensor LH *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH *4 Floor Wire
      *5 Connector B *6 Connector E
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      		 *b

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-1 (BDL+) - K40-2 (BDL-) Always Below 1 Ω

    NG

    CHECK FRONT DOOR WIRE LH (OPEN) Click here

    OK

  7. CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (SHORT)


    1. A004FA1E06
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector B
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Disconnect the service wire from connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-1 (BDL+) - K40-2 (BDL-) Always 1 MΩ or higher

    NG

    CHECK FRONT DOOR WIRE LH (SHORT) Click here

    OK

  8. CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (SHORT TO B+)


    1. A004FA1E07
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector B
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Connect the cable to the negative (-) auxiliary battery terminal.

    2. Turn the ignition switch to ON (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      K40-1 (BDL+) - Body ground Ignition switch ON (IG) Below 1 V
      K40-2 (BDL-) - Body ground Ignition switch ON (IG) Below 1 V

    NG

    CHECK FRONT DOOR WIRE LH (SHORT TO B+) Click here

    OK

  9. CHECK FLOOR WIRE AND FRONT DOOR WIRE LH (SHORT TO GROUND)


    1. A004FA1E08
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector B
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      Turn the ignition switch off.

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K40-1 (BDL+) - Body ground Always 1 MΩ or higher
      K40-2 (BDL-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FRONT DOOR WIRE LH (SHORT TO GROUND) Click here

    OK

  10. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH


    1. A004GA8E01
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly

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

    2. Interchange the No. 2 side airbag sensor assembly LH with the No. 2 side airbag sensor assembly RH and connect the connectors to them.

    3. Connect the cable to the negative (-) auxiliary battery terminal.

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

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

    6. Turn the ignition switch off.

    7. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1647/82 is output. A
      DTC B1642/81 is output. B
      DTC B1642/81 or B1647/82 is not output. C

      Tech Tips

      Codes other than DTCs 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 (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    11. Return the No. 2 side airbag sensor assembly LH and the No. 2 side airbag sensor assembly RH to their original positions and connect the connectors to them.


    B

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  11. CHECK DOOR SIDE AIRBAG SENSOR LH


    1. A004FDUE03
      Text in Illustration
      *1 Door Side Airbag Sensor RH
      *2 No. 2 Side Airbag Sensor Assembly LH

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

    2. Connect the cable to the negative (-) auxiliary battery terminal.

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

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1642/81 or B1647/82 is not output. A
      DTC B1647/82 is output. B
      DTC B1642/81 is output. C

      Tech Tips

      Codes other than DTCs 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 (-) auxiliary battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

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


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    C

    REPLACE DOOR SIDE AIRBAG SENSOR LH Click here

  12. CHECK FRONT DOOR WIRE LH (OPEN)


    1. Disconnect the floor wire connector from the front door wire LH.

      A004G2PE01
      Text in Illustration
      *1 Door Side Airbag Sensor LH *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH *4 Floor Wire
      *5 Connector D *6 Connector E
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Floor Wire)

      		 *b

      Front view of wire harness connector

      (to Door Side Airbag Sensor LH)

      Tech Tips

      The service wire has already been inserted into connector E.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HK2-1 (BDL+) - HK2-2 (BDL-) Always Below 1 Ω

    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE FRONT DOOR WIRE LH

  13. CHECK FRONT DOOR WIRE LH (SHORT)


    1. A004F8EE02
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector D
      *a

      Front view of wire harness connector

      (to Floor Wire)

      Disconnect the floor wire connector from the front door wire LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HK2-1 (BDL+) - HK2-2 (BDL-) Always 1 MΩ or higher

    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE FRONT DOOR WIRE LH

  14. CHECK FRONT DOOR WIRE LH (SHORT TO B+)


    1. Turn the ignition switch off.

    2. A004F8EE02
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector D
      *a

      Front view of wire harness connector

      (to Floor Wire)

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

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Disconnect the front door wire connector from the floor wire.

    4. Connect the cable to the negative (-) auxiliary battery terminal.

    5. Turn the ignition switch to ON (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      HK2-1 (BDL+) - Body ground Ignition switch ON (IG) Below 1 V
      HK2-2 (BDL-) - Body ground Ignition switch ON (IG) Below 1 V

    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE FRONT DOOR WIRE LH

  15. CHECK FRONT DOOR WIRE LH (SHORT TO GROUND)


    1. A004F8EE02
      Text in Illustration
      *1 Door Side Airbag Sensor LH
      *2 No. 2 Side Airbag Sensor Assembly LH
      *3 Front Door Wire LH
      *4 Floor Wire
      *5 Connector D
      *a

      Front view of wire harness connector

      (to Floor Wire)

      Disconnect the front door wire connector from the floor wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      HK2-1 (BDL+) - Body ground Always 1 MΩ or higher
      HK2-2 (BDL-) - Body ground Always 1 MΩ or higher

    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE FRONT DOOR WIRE LH