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Home >> Toyota >> 2017 >> Highlander XLE, FWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes & Circuit Tests - (Except Hybrid) >> Airbag System >> DTC B1653-35: Seat Position Airbag Sensor Circuit Malfunction [12/2013 - ] >> Procedure

DTC B1653-35: Seat Position Airbag Sensor Circuit Malfunction [12/2013 - ]: Procedure

  1. CHECK CONNECTORS 
    1. Turn the ignition 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 sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.

      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 sensor assembly, front seat inner belt assembly LH and seat position airbag sensor.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    REPLACE WIRE HARNESS 

    Result:  1

    OK 

    See step  2

  2. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN) 
    1. Connect the connectors to the front seat inner belt assembly LH and No. 2 floor wire.
      GTY437019Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Seat Position Airbag Sensor)
    2. Using a service wire, connect terminals 9 (LSP+) and 17 (LSP-) 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
      2 (LSP+) - 1 (LSP-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  11

    Result:  1

    OK 

    See step  3

  3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT) 
    1. Disconnect the service wire from connector B.
      GTY433533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Seat Position Airbag Sensor)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

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

      Result

      Result
      OK
      NG

    Result:  2

    NG 

    See step  10

    Result:  1

    OK 

    See step  4

  4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY433533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Seat Position Airbag Sensor)
    2. Turn the ignition switch to ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      2 (LSP+) - Body ground Ignition switch ON Below 1 V
      1 (LSP-) - Body ground Ignition switch ON Below 1 V
    4. Turn the ignition 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

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  9

    Result:  1

    OK 

    See step  5

  5. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2 (LSP+) - Body ground Always 1 MΩ or higher
      1 (LSP-) - Body ground Always 1 MΩ or higher
      GTY433533Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *a Front view of wire harness connector
      (to Seat Position Airbag Sensor)

      Result

      Proceed to
      OK
      NG

    Result:  2

    NG 

    See step  8

    Result:  1

    OK 

    See step  6

  6. CHECK DTC 
    1. Connect the connectors to the airbag sensor assembly and seat position airbag sensor.
      GTY428055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) battery terminal.
    3. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [12/2013 - ]

      Body Electrical > SRS Airbag > Clear DTCs 

    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON, and wait for at least 60 seconds.
    6. Check for DTCs.

      Refer to DTC CHECK / CLEAR [12/2013 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1653-35 is not output.

      HINT: 

      Codes other than DTC B1653-35 may be output at this time, but they are not related to this check.

      Result

      Result
      OK
      NG

    Result:  1

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2013 - 11/2016]  Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2016 - ] 

    Result:  2

    NG 

    See step  7

  7. CHECK SEAT POSITION AIRBAG SENSOR 
    1. Turn the ignition switch off.
      GTY428055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
    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. Replace the seat position airbag sensor with a known good one.

      Refer to REMOVAL [12/2013 - ]

      HINT: 

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

    4. Connect the cable to the negative (-) battery terminal.
    5. Clear the DTCs stored in memory.

      Refer to DTC CHECK / CLEAR [12/2013 - ]

      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.

      Refer to DTC CHECK / CLEAR [12/2013 - ]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1653-35 is not output.

      HINT: 

      Codes other than DTC B1653-35 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.
    10. 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.

    11. Restore the seat position airbag sensor that was installed for testing to its original location.

      Refer to REMOVAL [12/2013 - ]

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE SEAT POSITION AIRBAG SENSOR. Refer to  REMOVAL [12/2013 - ] 

    Result:  2

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [12/2013 - ] 

  8. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) 
    1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.
      GTY440269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M4-4 (LSP+) - Body ground Always 1 MΩ or higher
      M4-3 (LSP-) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    for Manual Seat: Refer to REMOVAL [12/2013 - ]

    for Power Seat: Refer to REMOVAL [12/2013 - ]

    Result:  2

    NG 

    REPLACE NO. 2 FLOOR WIRE 

  9. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) 
    1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.
      GTY440269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly LH)
    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
      M4-4 (LSP+) - Body ground Ignition switch ON Below 1 V
      M4-3 (LSP-) - Body ground Ignition switch ON Below 1 V

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    for Manual Seat: Refer to REMOVAL [12/2013 - ]

    for Power Seat: Refer to REMOVAL [12/2013 - ]

    Result:  2

    NG 

    REPLACE NO. 2 FLOOR WIRE 

  10. CHECK NO. 2 FLOOR WIRE (SHORT) 
    1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.
      GTY440269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *a Front view of wire harness connector
      (to Front Seat Inner Belt Assembly LH)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      M4-4 (LSP+) - M4-3 (LSP-) Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    for Manual Seat: Refer to REMOVAL [12/2013 - ]

    for Power Seat: Refer to REMOVAL [12/2013 - ]

    Result:  2

    NG 

    REPLACE NO. 2 FLOOR WIRE 

  11. CHECK NO. 2 FLOOR WIRE (OPEN) 
    1. Disconnect the No. 2 floor wire from the front seat inner belt assembly LH.
      GTY442561Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Seat Position Airbag Sensor
      *2 Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 No. 2 Floor Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Front Seat Inner Belt Assembly LH)

      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
      M4-4 (LSP+) - M4-3 (LSP-) Always Below 1 Ω
    3. Disconnect the service wire from the connector B.

      Result

      Proceed to
      OK
      NG

    Result:  1

    OK 

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

    for Manual Seat: Refer to REMOVAL [12/2013 - ]

    for Power Seat: Refer to REMOVAL [12/2013 - ]

    Result:  2

    NG 

    REPLACE NO. 2 FLOOR WIRE 

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