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AIRBAG SYSTEM, Diagnostic DTC:B1676/85, B1677/85

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DTC Code DTC Name
B1676/85 Lost Communication with Rear Floor Airbag Sensor RH
B1677/85 Rear Floor Airbag Sensor RH Initialization Incomplete
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DESCRIPTION

Tip:

"Rear floor airbag sensor RH" refer to the rear floor airbag sensor.


DTC Code DTC Detection Condition Trouble Area
B1676/85

When one of the following conditions is met:


  • The center airbag sensor 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 rear floor airbag sensor circuit for 2 seconds.

  • A rear floor airbag sensor malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Rear floor airbag sensor

  • Center airbag sensor assembly
B1677/85

When one of the following conditions is met:


  • The center airbag sensor 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 rear floor airbag sensor circuit for 2 seconds.

  • A rear floor airbag sensor malfunction.

  • A center airbag sensor malfunction.

  • No. 2 floor wire

  • Rear floor airbag sensor

  • Center airbag sensor assembly
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WIRING DIAGRAM

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INSPECTION PROCEDURE

Note:

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (Click here).

  • When disconnecting the cable, some systems need to be initialized after the cable is reconnected (Click here).

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PROCEDURE


  1. Click here

    CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

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

    3. Check that the connectors are properly connected to the center airbag sensor and the rear floor airbag sensor.

      OK
      The connectors are properly connected.

  2. Click here

    CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor and rear floor airbag sensor.

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

      OK
      The connectors are not deformed or damaged.

  3. Click here

    CHECK REAR FLOOR AIRBAG SENSOR CIRCUIT


    1. A0155G6E01

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L19-2 (BER+) - Body ground Ignition switch ON Below 1 V
      L19-1 (BER-) - Body ground Ignition switch ON Below 1 V

    3. Turn the ignition switch off.

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

    5. Using a service wire, connect terminals 21 (BDR+) and 22 (BDR-) of connector B.

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L19-2 (BER+) - L19-1 (BER-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L19-2 (BER+) - L19-1 (BER-) Always 1 MΩ or higher
      L19-2 (BER+) - Body ground Always 1 MΩ or higher
      L19-1 (BER-) - Body ground Always 1 MΩ or higher

  4. Click here

    CHECK REAR FLOOR AIRBAG SENSOR


    1. A0155XLE02

      Connect the connectors to the center airbag sensor.

    2. Temporarily replace the rear floor airbag sensor with a new one.

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

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


      1. Check for DTCs (Click here).

        OK
        DTC B1676 and B1677are not output.
        Tip:

        Codes other than DTC B1676 and B1677 may be output at this time, but they are not related to this check.


  5. Click here

    CONNECT CONNECTORS PROPERLY

  6. Click here

    REPLACE HARNESS AND CONNECTOR

  7. Click here

    REPLACE NO. 2 FLOOR WIRE

  8. Click here

    USE SIMULATION METHOD TO CHECKClick here

  9. Click here

    REPLACE REAR FLOOR AIRBAG SENSORClick here

  10. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here