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AIRBAG SYSTEM, Diagnostic DTC:B163B, B163C

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

The side collision sensor LH circuit consists of the airbag ECU assembly, door side airbag sensor LH, side airbag sensor assembly LH, rear airbag sensor LH and No. 2 side airbag sensor assembly.

The door side airbag sensor LH, side airbag sensor assembly LH, rear airbag sensor LH and No. 2 side airbag sensor assembly 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 No. 2 side collision sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B163B 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 No. 2 side airbag sensor assembly LH malfunction

  • An airbag ECU assembly malfunction

  • Floor wire

  • No. 2 side airbag sensor assembly LH

  • Airbag ECU assembly

 Comes on Not applicable
B163C 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 No. 2 side airbag sensor assembly LH malfunction

  • An airbag ECU assembly malfunction

  • Floor wire

  • No. 2 side airbag sensor assembly LH

  • Airbag ECU assembly

 Comes on Not applicable
Table 1. *a BFL+ *b BFL- *c No. 2 Side Airbag Sensor Assembly LH *d Airbag ECU Assembly
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WIRING DIAGRAM

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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.

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  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

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PROCEDURE


  1. Click here

    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 No. 2 side airbag sensor assembly LH.

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

    • The connectors are properly connectedClick here
    • The connectors are not properly connected

      CONNECT CONNECTORS PROPERLY

  2. Click here

    CHECK CONNECTORS


    1. Disconnect the connectors from the airbag ECU assembly and No. 2 side airbag sensor assembly LH.

    2. B004TEOC33
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire

      Check that the connectors (on the airbag ECU assembly side and No. 2 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 not deformed or damagedClick here
    • The connectors are deformed or damaged

      REPLACE FLOOR WIRE

  3. Click here

    CHECK FLOOR WIRE


    1. B004UL4C04
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Airbag ECU Assembly
      *3 Floor Wire
      *4 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 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
      L98-2 (BFL+) - Body ground Power switch on (IG) Below 1 V
      L98-1 (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
      L98-2 (BFL+) - L98-1 (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
      L98-2 (BFL+) - L98-1 (BFL-) Always 1 MΩ or higher
      L98-2 (BFL+) - Body ground Always 1 MΩ or higher
      L98-1 (BFL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

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    CHECK NO.2 SIDE AIRBAG SENSOR ASSEMBLY LH


    1. Connect the connectors to the airbag ECU assembly.

    2. B004YGYC20
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag ECU Assembly

      Interchange the No. 2 side airbag sensor assembly 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.

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      1. 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.

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      1. Body Electrical > SRS Airbag > Trouble Codes


      Result
      Proceed to
      DTC B163B or B163C is output
      DTC B162B or B162C is output
      DTC B162B, B162C, B163B and B163C are not output
      Tip:

      Codes other than DTC B162B, B162C, B163B and B163C 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 assembly RH and LH to their original positions and connect the connectors to them.


    • DTC B163B or B163C is output

      REPLACE AIRBAG ECU ASSEMBLYClick here

    • DTC B162B or B162C is output

      REPLACE SIDE AIRBAG SENSOR ASSEMBLY LHClick here

    • DTC B162B, B162C, B163B and B163C are not output

      USE SIMULATION METHOD TO CHECKClick here