AIRBAG SYSTEM, Diagnostic DTC:B163B/86, B163C/86

DTC Code DTC Name
B163B/86 Side Airbag Sensor Assembly No.2 Lost Communication (LH)
B163C/86 Side Airbag Sensor Assembly No.2 Initialization Error (LH)

DESCRIPTION

The side collision sensor LH circuit consists of the airbag ECU assembly, door side airbag sensor LH, side airbag sensor assembly LH and rear airbag sensor LH.

The door side airbag sensor LH, side airbag sensor assembly LH and rear airbag sensor LH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B163B/86 Side Airbag Sensor Assembly No.2 Lost Communication (LH)

One of the following conditions is met:


  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit.

  • A side airbag sensor assembly LH malfunction

  • An airbag ECU assembly malfunction

  • Floor wire

  • Side airbag sensor assembly LH

  • Airbag ECU assembly

 Comes on Not applicable
B163C/86 Side Airbag Sensor Assembly No.2 Initialization Error (LH)

One of the following conditions is met:


  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit.

  • A side airbag sensor assembly LH malfunction

  • An airbag ECU assembly malfunction

  • Floor wire

  • Side airbag sensor assembly LH

  • Airbag ECU assembly

 Comes on Not applicable

WIRING DIAGRAM

B0049ZKE08
*a BFL+
*b BFL-
*c Side Airbag Sensor Assembly LH
*d Airbag ECU Assembly

CAUTION / NOTICE / HINT

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 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 airbag ECU assembly and side airbag sensor assembly LH.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  2. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag ECU assembly and side airbag sensor assembly LH.

    2. B004CFRC33
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged

    REPLACE FLOOR WIRE

    The connectors are not deformed or damaged

  3. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH


    1. B004AXHC02
      *1 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor Assembly LH)
      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Connect the cable to the negative (-) auxiliary battery terminal, 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
      X76-2 (BFL+) - Body ground Power switch on (IG) Below 1 V
      X76-1 (BFL-) - 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 29 (BCL+) and 30 (BCL-) 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
      X76-2 (BFL+) - X76-1 (BFL-) 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
      X76-2 (BFL+) - X76-1 (BFL-) Always 1 MΩ or higher
      X76-2 (BFL+) - Body ground Always 1 MΩ or higher
      X76-1 (BFL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK SIDE AIRBAG SENSOR ASSEMBLY LH


    1. Connect the connectors to the airbag ECU assembly.

    2. B004CILC01
      *1 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly

      Interchange the side side 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


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Result Proceed to
      DTC B163B/82 or B163C/86 is output A
      DTC B162B/81 or B162C/85 is output B
      DTC B162B/81, B162C/85, B163B/82 and B163C/86 are not output C

      Tech Tips

      Codes other than DTC B162B/81, B162C/85, B163B/82 and B163C/86 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 side airbag sensor RH and LH to their original positions and connect the connectors to them.


    A

    REPLACE AIRBAG ECU ASSEMBLY Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here