AIRBAG SYSTEM, Diagnostic DTC:B1617, B1618

DTC Code DTC Name
B1617 Front Airbag Sensor Lost Communication (LH)
B1618 Front Airbag Sensor Initialization Error (LH)

DESCRIPTION

The front airbag sensor LH circuit consists of the airbag sensor assembly and front airbag sensor LH.

The front airbag sensor LH detects impacts to the vehicle and sends signals to the airbag sensor assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the front airbag sensor LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1617 Front Airbag Sensor Lost Communication (LH)

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

  • Front airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor LH

  • Airbag sensor assembly

 Comes on Does not apply to test/check mode
B1618 Front Airbag Sensor Initialization Error (LH)

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

  • Front airbag sensor LH malfunction

  • Airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor LH

  • Airbag sensor assembly

 Comes on Does not apply to test/check mode

WIRING DIAGRAM

B006XQ6E08
*a Element
*b Interface
*c Front Airbag Sensor LH
*d Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note

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

Click here

PROCEDURE


  1. CHECK CONNECTION OF CONNECTORS


    1. Turn the ignition switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag sensor assembly and front airbag sensor LH. Also check that the connectors that link the engine room main wire and instrument panel wire are properly connected.

      OK
      The connectors are properly connected.
      Result
      Proceed to
      OK
      NG

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  2. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag sensor assembly and front airbag sensor LH. Also disconnect the connectors that link the engine room main wire and instrument panel wire.

    2. Check that the terminals of the connectors are not deformed or damaged.

      OK
      The terminals are not deformed or damaged.
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE OR ENGINE ROOM MAIN WIRE

    OK

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT


    1. B0070FYC01
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      Connect the connectors that link the engine room main wire and instrument panel wire.

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A43-2 (+SL) - Body ground Ignition switch ON Below 1 V
      A43-1 (-SL) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

      CAUTION:

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

    7. Using a service wire, connect terminals 30 (+SL) and 31 (-SL) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-2 (+SL) - A43-1 (-SL) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A43-2 (+SL) - A43-1 (-SL) Always 1 MΩ or higher
      A43-2 (+SL) - Body ground Always 1 MΩ or higher
      A43-1 (-SL) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  4. CHECK FRONT AIRBAG SENSOR LH


    1. B006ZPQC02
      *1 Front Airbag Sensor RH
      *2 Airbag Sensor Assembly

      Connect the connector to the airbag sensor assembly.

    2. Interchange the front airbag sensor LH with RH and connect the connectors.

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

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

    5. Clear the DTCs stored in memory.


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the ignition switch off.

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

    8. Check for DTCs.


      Body Electrical > SRS Airbag > Trouble Codes

      Tech Tips

      Codes other than DTCs B1612, B1613, B1617 and B1618 may be output at this time, but they are not related to this check.

      Result
      Result Proceed to
      DTCs B1612, B1613, B1617 and B1618 are not output. A
      DTC B1617 or B1618 is output. B
      DTC B1612 or B1613 is output. C

    9. Turn the ignition switch off.

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

      CAUTION:

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

    11. Return the front airbag sensor LH and RH to their original positions and connect the connectors.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    C

    REPLACE FRONT AIRBAG SENSOR LH Click here

  5. CHECK INSTRUMENT PANEL WIRE


    1. B006Z8EC01
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag Sensor Assembly)
      *b

      Front view of wire harness connector

      (to Engine Room Main Wire)

      Disconnect the instrument panel wire connector from the engine room main wire.

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

    3. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      AK6-2 (+SL) - Body ground Ignition switch ON Below 1 V
      AK6-4 (-SL) - Body ground Ignition switch ON Below 1 V

    5. Turn the ignition switch off.

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

      CAUTION:

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

    7. Using a service wire, connect terminals 30 (+SL) and 31 (-SL) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AK6-2 (+SL) - AK6-4 (-SL) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      AK6-2 (+SL) - AK6-4 (-SL) Always 1 MΩ or higher
      AK6-2 (+SL) - Body ground Always 1 MΩ or higher
      AK6-4 (-SL) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE