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Home >> Toyota >> 2017 >> Avalon XLE >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes & Symptom Tests - (Except Hybrid) >> Airbag System >> DTC B1615/14: Front Airbag Sensor LH Circuit Malfunction [10/2014 - ] >> Procedure

DTC B1615/14: Front Airbag Sensor LH Circuit Malfunction [10/2014 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the engine switch off.
    2. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

      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 ECU 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.

      HINT: 

      If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU 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.

    Result: 

    NG 

    REPLACE WIRE HARNESS 

    Result: 

    OK 

    See step  2

  2. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (OPEN) 
    1. Connect the connectors that link the engine room main wire and instrument panel wire.
      GTY547265Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Front Airbag Sensor LH)
    2. Using a service wire, connect terminals 30 (+SL) and 28 (-SL) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - A8-1 (-SL) Always Below 1 Ω

    Result: 

    NG 

    See step  7

    Result: 

    OK 

    See step  3

  3. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT) 
    1. Disconnect the service wire from connector B.
      GTY592334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - A8-1 (-SL) Always 1 MΩ or higher

    Result: 

    NG 

    See step  8

    Result: 

    OK 

    See step  4

  4. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY592334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - Body ground Engine switch on (IG) Below 1 V
      A8-1 (-SL) - Body ground Engine switch on (IG) Below 1 V
    4. Turn the engine switch off.
    5. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

    Result: 

    NG 

    See step  9

    Result: 

    OK 

    See step  5

  5. CHECK FRONT AIRBAG SENSOR LH CIRCUIT (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY592334Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *a Front view of wire harness connector
      (to Front Airbag Sensor LH)

      Standard Resistance

      Tester Connection Condition Specified Condition
      A8-2 (+SL) - Body ground Always 1 MΩ or higher
      A8-1 (-SL) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    See step  10

    Result: 

    OK 

    See step  6

  6. CHECK FRONT AIRBAG SENSOR LH 
    1. Connect the connector to the airbag ECU assembly.
      GTY406684Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor RH
      *2 Airbag ECU Assembly
    2. Interchange the front airbag sensor LH with RH and connect the connectors.
    3. Connect the cable to the negative (-) battery terminal.
    4. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
    5. Turn the engine switch off.
    6. Turn the engine switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

      Result

      Result Proceed to
      DTCs B1610/13 and B1615/14 are not output. A
      DTC B1615/14 is output. B
      DTC B1610/13 is output. C

      HINT: 

      Codes other than DTCs B1610/13 and B1615/14 may be output at this time, but they are not related to this check.

    8. Turn the engine switch off.
    9. Disconnect the cable from the negative (-) battery terminal.
      WARNING:

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

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

    Result: 

    A 

    USE SIMULATION METHOD TO CHECK 

    (Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] or HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

    Result: 

    B 

    REPLACE AIRBAG ECU ASSEMBLY 

    (Refer to REMOVAL [10/2014 - ] )

    Result: 

    C 

    REPLACE FRONT AIRBAG SENSOR LH 

    (Refer to REMOVAL [10/2014 - ] )

  7. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      GTY596822Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Engine Room Main Wire)

      HINT: 

      The service wire 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
      DA4-3 (+SL) - DA4-4 (-SL) Always Below 1 Ω
    3. Disconnect the service wire from connector B.

    Result: 

    OK 

    REPLACE ENGINE ROOM MAIN WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  8. CHECK INSTRUMENT PANEL WIRE (SHORT) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      GTY589045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      DA4-3 (+SL) - DA4-4 (-SL) Always 1 MΩ or higher

    Result: 

    OK 

    REPLACE ENGINE ROOM MAIN WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  9. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      GTY589045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      DA4-3 (+SL) - Body ground Engine switch on (IG) Below 1 V
      DA4-4 (-SL) - Body ground Engine switch on (IG) Below 1 V

    Result: 

    OK 

    REPLACE ENGINE ROOM MAIN WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  10. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) 
    1. Disconnect the instrument panel wire connector from the engine room main wire.
      GTY589045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Front Airbag Sensor LH
      *2 Airbag ECU Assembly
      *3 Engine Room Main Wire
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Engine Room Main Wire)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      DA4-3 (+SL) - Body ground Always 1 MΩ or higher
      DA4-4 (-SL) - Body ground Always 1 MΩ or higher

    Result: 

    OK 

    REPLACE ENGINE ROOM MAIN WIRE 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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