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 center airbag sensor assembly and front airbag sensor LH.

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

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

DTC No. DTC Detection Condition Trouble Area

B1617/84

B1618/84

  • The center 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

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01NK78E05

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the power switch off.

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

      Note

      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 center 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 center 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 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)


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

      A01NKQIE03
      Text in Illustration
      *1 Front Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *4

      Front view of wire harness connector

      (to Front Airbag Sensor LH)
      *5 Connector B *6 Connector E

    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.

      SST
      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-2 (+SL) - A5-1 (-SL) Always Below 1 Ω

    NG

    CHECK INSTRUMENT PANEL WIRE (OPEN) Click here

    OK

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT)


    1. A01NMKZE06
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Airbag Sensor LH)
      *4 Connector E

      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
      A5-2 (+SL) - A5-1 (-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. A01NMKZE06
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Airbag Sensor LH)
      *4 Connector E

      Connect the cable to the negative (-) 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
      A5-2 (+SL) - Body ground Power switch on (IG) Below 1 V
      A5-1 (-SL) - Body ground Power switch on (IG) Below 1 V

    4. Turn the power switch off.

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

      Note

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


    NG

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

    OK

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


    1. A01NMKZE06
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Front Airbag Sensor LH)
      *4 Connector E

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A5-2 (+SL) - Body ground Always 1 MΩ or higher
      A5-1 (-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. A01NIHGE01
      Text in Illustration
      *1 Front Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

      Connect the connector to the center 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 power switch on (IG), and wait for at least 60 seconds.

    5. Clear the DTCs stored in the 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
      DTC 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 DTC 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 (-) battery terminal.

      Note

      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.


    B

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    C

    REPLACE FRONT AIRBAG SENSOR LH Click here

    A

    USE SIMULATION METHOD TO CHECK Click here

  7. CHECK INSTRUMENT PANEL WIRE (OPEN)


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

      A01NJD3E04
      Text in Illustration
      *1 Front Airbag Sensor LH *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *6

      Front view of wire harness connector

      (to Engine Room Main Wire)
      *7 Connector B *8 Connector C

      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
      AF6-1 (+SL) - AF6-2 (-SL) Always Below 1 Ω

    3. Disconnect SST from connector B.


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE ENGINE ROOM MAIN WIRE

  8. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A01NIZHE04
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Engine Room Main Wire)
      *6 Connector C

      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
      AF6-1 (+SL) - AF6-2 (-SL) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE ENGINE ROOM MAIN WIRE

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


    1. A01NIZHE04
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Engine Room Main Wire)
      *6 Connector C

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

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      AF6-1 (+SL) - Body ground Power switch on (IG) Below 1 V
      AF6-2 (-SL) - Body ground Power switch on (IG) Below 1 V

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE ENGINE ROOM MAIN WIRE

  10. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A01NIZHE04
      Text in Illustration
      *1 Front Airbag Sensor LH
      *2 Center Airbag Sensor Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5

      Front view of wire harness connector

      (to Engine Room Main Wire)
      *6 Connector C

      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
      AF6-1 (+SL) - Body ground Always 1 MΩ or higher
      AF6-2 (-SL) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE ENGINE ROOM MAIN WIRE