AIRBAG SYSTEM, Diagnostic DTC:B1617/84, B1618/84

DTC Code DTC Name
B1617/84 Lost Communication with Front Airbag Sensor LH
B1618/84 Front Airbag Sensor LH Initialization Incomplete

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 airbag should be deployed.

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

DTC No. DTC Detection Condition Trouble Area

B1617/84

B1618/84

  • 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 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

WIRING DIAGRAM

B001LO7E36
*a Front Airbag Sensor LH
*b Airbag Sensor 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.

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the power 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 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.

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

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

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN)

    SST
    09843-18040

    1. w/o Rear Pretensioner

      B001LJKE01

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

      2. Using SST, connect terminals 30 (+SL) and 28 (-SL) of connector B.

        Note

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A7-2 (+SL) - A7-1 (-SL) Always Below 1 Ω
        Text in Illustration
        *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
        *3 Connector B *4 Connector E
        *a

        Front view of wire harness connector

        (to Airbag Sensor Assembly)

        		 *b

        Front view of wire harness connector

        (to Front Airbag Sensor LH)
      SST
      09843-18040

    2. w/ Rear Pretensioner

      B001N68E01

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

      2. Using SST, connect terminals 30 (+SL) and 28 (-SL) of connector B.

        Note

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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A7-2 (+SL) - A7-1 (-SL) Always Below 1 Ω
        Text in Illustration
        *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
        *3 Connector B *4 Connector E
        *a

        Front view of wire harness connector

        (to Airbag Sensor Assembly)

        		 *b

        Front view of wire harness connector

        (to Front Airbag Sensor LH)

    NG

    CHECK INSTRUMENT PANEL WIRE (OPEN) Click here

    OK

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    1. B001LQNE01
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/o Rear Pretensioner


      1. Disconnect SST from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A7-2 (+SL) - A7-1 (-SL) Always 1 MΩ or higher
    2. B001KR7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/ Rear Pretensioner


      1. Disconnect SST from connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        A7-2 (+SL) - A7-1 (-SL) Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE (SHORT) Click here

    OK

  4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+)


    1. B001LQNE01
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/o Rear Pretensioner


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

      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
        A7-2 (+SL) - Body ground Power switch on (IG) Below 1 V
        A7-1 (-SL) - Body ground Power switch on (IG) Below 1 V
    2. B001KR7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/ Rear Pretensioner


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

      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
        A7-2 (+SL) - Body ground Power switch on (IG) Below 1 V
        A7-1 (-SL) - Body ground Power switch on (IG) Below 1 V

    NG

    CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) Click here

    OK

  5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND)


    1. B001LQNE01
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/o Rear Pretensioner


      1. Turn the power 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
        A7-2 (+SL) - Body ground Always 1 MΩ or higher
        A7-1 (-SL) - Body ground Always 1 MΩ or higher
    2. B001KR7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Connector E
      *a

      Front view of wire harness connector

      (to Front Airbag Sensor LH)

      w/ Rear Pretensioner


      1. Turn the power 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
        A7-2 (+SL) - Body ground Always 1 MΩ or higher
        A7-1 (-SL) - Body ground Always 1 MΩ or higher

    NG

    CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) Click here

    OK

  6. CHECK FRONT AIRBAG SENSOR LH


    1. B001KLNE01
      Text in Illustration
      *A w/o Rear Pretensioner
      *B w/ Rear Pretensioner
      *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 (-) auxiliary battery terminal.

    4. Turn the power switch on (IG), and wait for at least 60 seconds.

    5. Clear the DTCs stored in memory Click here.

    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.

      Result
      Result Proceed to
      DTCs B1612/83, B1613/83, B1617/84 and B1618/84 are not output. A
      DTC B1617/84 or B1618/84 is output. B
      DTC B1612/83 or B1613/83 is output. C

      Tech Tips

      Codes other than DTCs B1612/83, B1613/83, B1617/84 and B1618/84, 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.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary 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

  7. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. w/o Rear Pretensioner

      B001L38E01

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

        Tech Tips

        SST has already been inserted into connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - AH4-2 (-SL) Always Below 1 Ω

      3. Disconnect SST from connector B.

        Text in Illustration
        *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
        *3 Engine Room Main Wire *4 Instrument Panel Wire
        *5 Connector B *6 Connector C
        *a

        Front view of wire harness connector

        (to Airbag Sensor Assembly)

        		 *b

        Front view of wire harness connector

        (to Engine Room Main Wire)

    2. w/ Rear Pretensioner

      B001KIRE01

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

        Tech Tips

        SST has already been inserted into connector B.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - AH4-2 (-SL) Always Below 1 Ω

      3. Disconnect SST from connector B.

        Text in Illustration
        *1 Front Airbag Sensor LH *2 Airbag Sensor Assembly
        *3 Engine Room Main Wire *4 Instrument Panel Wire
        *5 Connector B *6 Connector C
        *a

        Front view of wire harness connector

        (to Airbag Sensor Assembly)

        		 *b

        Front view of wire harness connector

        (to Engine Room Main Wire)

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE

  8. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. B001LJVE02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/o Rear Pretensioner


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - AH4-2 (-SL) Always 1 MΩ or higher
    2. B001LA7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/ Rear Pretensioner


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - AH4-2 (-SL) Always 1 MΩ or higher

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE

  9. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. B001LJVE02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/o Rear Pretensioner


      1. Turn the power 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. Disconnect the instrument panel wire connector from the engine room main wire.

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

      5. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        AH4-1 (+SL) - Body ground Power switch on (IG) Below 1 V
        AH4-2 (-SL) - Body ground Power switch on (IG) Below 1 V
    2. B001LA7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/ Rear Pretensioner


      1. Turn the power 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. Disconnect the instrument panel wire connector from the engine room main wire.

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

      5. Turn the power switch on (IG).

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        AH4-1 (+SL) - Body ground Power switch on (IG) Below 1 V
        AH4-2 (-SL) - Body ground Power switch on (IG) Below 1 V

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE

  10. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. B001LJVE02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/o Rear Pretensioner


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - Body ground Always 1 MΩ or higher
        AH4-2 (-SL) - Body ground Always 1 MΩ or higher
    2. B001LA7E02
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Connector C
      *a

      Front view of wire harness connector

      (to Engine Room Main Wire)

      w/ Rear Pretensioner


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

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        AH4-1 (+SL) - Body ground Always 1 MΩ or higher
        AH4-2 (-SL) - Body ground Always 1 MΩ or higher

    OK

    REPLACE ENGINE ROOM MAIN WIRE

    NG

    REPLACE INSTRUMENT PANEL WIRE