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Home >> Toyota >> 2019 >> Prius XLE AWD-e >> Repair and Diagnosis >> External Pages >> Different car >> Section 419 (Supplemental Restraint System - Diagnostic Codes (B1656-U0154) & Symptom Tests (Hybrid)) >> AIRBAG SYSTEM (for HV Model) >> DTC B1656: Seat Belt Buckle Switch (LH) [04/2018 -] >> Procedure

DTC B1656: Seat Belt Buckle Switch (LH) [04/2018 -]: Procedure

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

      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 ECU assembly and front seat inner belt assembly LH.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  2

  2. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly and front seat inner belt assembly LH.
    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

    Result: 

    NG 

    REPLACE FLOOR WIRE OR FRONT SEAT INNER BELT ASSEMBLY LH 

    Result: 

    OK 

    See step  3

  3. CHECK FLOOR WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY843445Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *A w/o Seat Position Memory System *B w/ Seat Position Memory System
      *1 Front Seat Inner Belt Assembly LH *2 Airbag ECU Assembly
      *3 Floor Wire *4 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)      		 *b Front view of wire harness connector
      (to Front Seat Inner Belt Assembly LH)
    2. Turn the power switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      W/O SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K53-2 (LBE+) - Body ground Power switch on (IG) Below 1 V
      K53-1 (LBE-) - Body ground Power switch on (IG) Below 1 V
      W/ SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K54-1 (LBE+) - Body ground Power switch on (IG) Below 1 V
      K54-2 (LBE-) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

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

    6. Using a service wire, connect terminals 28 (LBE+) and 27 (LBE-) of connector B.
      NOTE:

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

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

      Standard Resistance

      W/O SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K53-2 (LBE+) - K53-1 (LBE-) Always Below 1 Ω
      W/ SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K54-1 (LBE+) - K54-2 (LBE-) Always Below 1 Ω
    8. Disconnect the service wire from connector B.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      W/O SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K53-2 (LBE+) - K53-1 (LBE-) Always 1 MΩ or higher
      K53-2 (LBE+) - Body ground Always 1 MΩ or higher
      K53-1 (LBE-) - Body ground Always 1 MΩ or higher
      W/ SEAT POSITION MEMORY SYSTEM:

      Tester Connection Condition Specified Condition
      K54-1 (LBE+) - K54-2 (LBE-) Always 1 MΩ or higher
      K54-1 (LBE+) - Body ground Always 1 MΩ or higher
      K54-2 (LBE-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE FLOOR WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK DTC 
    1. Connect the connectors to the airbag ECU assembly and front seat inner belt assembly LH.
      GTY447346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly LH
      *2 Airbag ECU Assembly
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the power switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

    5. Turn the power switch off.
    6. Turn the power switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1656 is not output.

      HINT: 

      Codes other than DTC B1656 may be output at this time, but they are not related to this check.

      Result

      Result
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2018 -] 

    Result: 

    NG 

    See step  5

  5. CHECK FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Turn the power switch off.
      GTY447346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Front Seat Inner Belt Assembly LH
      *2 Airbag ECU Assembly
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

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

    3. Replace the front seat inner belt assembly LH with a known good one.

      Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 -]

      HINT: 

      Perform the following inspection using known good parts from another vehicle if possible.

    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the power switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

    7. Turn the power switch off.
    8. Turn the power switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1656 is not output.

      HINT: 

      Codes other than DTC B1656 may be output at this time, but they are not related to this check.

    10. Turn the power switch off.
    11. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

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

    12. Restore the front seat inner belt assembly LH that was installed for testing to its original location.

      Refer to REMOVAL [04/2018 - 08/2021] , or refer to REMOVAL [08/2021 -]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH. Refer to  REMOVAL [04/2018 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

    Result: 

    NG 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [04/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021]  , or refer to  REMOVAL [08/2021 -] 

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