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Home >> Toyota >> 2008 >> FJ Cruiser RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 194 (Supplemental Restraint System) >> Airbag System >> DTC B1653/35 Seat Position Airbag Sensor Circuit Malfunction >> Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2008 Toyota Yaris. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: In order to prevent unexpected airbag deployment, disconnect the following connectors before inspecting parts such as wire harnesses, if the application of tester probes to the center airbag sensor assembly connector is necessary.
  1. Turn the ignition switch to the lock position.
  2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
  3. Disconnect the connector from the center airbag sensor assembly.
  4. Disconnect the connectors from the steering pad.
  5. Disconnect the connectors from the front passenger airbag assembly.
  6. Disconnect the connector from the front seat outer belt assembly LH
  7. Disconnect the connector from the front seat outer belt assembly RH.

    HINT:

    Skip the following steps if side and curtain shield airbags are not fitted.

  8. Disconnect the connector from the front seat side airbag assembly LH.
  9. Disconnect the connector from the front seat side airbag assembly RH.
  10. Disconnect the connector from the curtain shield airbag assembly LH.
  11. Disconnect the connector from the curtain shield airbag assembly RH.
  1. CHECK DTC 
    1. Turn the ignition switch on and wait for at least 60 seconds.
    2. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    3. Turn the ignition switch off.
    4. Turn the ignition switch on and wait for at least 60 seconds.
    5. Check the DTCs (See DTC CHECK / CLEAR  ).

      OK: DTC B1653/35 is not output. 

      HINT:

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

      6. Fig 1: Checking DTC
      G04830053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: USE SIMULATION METHOD TO CHECK 

    NG: GO TO NEXT STEP 

  2. CHECK CONNECTION OF CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor assembly and the seat position sensor.

      OK: The connectors are properly connected. 

    NG: CONNECT CONNECTORS 

    OK: GO TO NEXT STEP 

  3. CHECK SEAT POSITION SENSOR CIRCUIT (FOR OPEN) 
    1. Disconnect the connectors from the center airbag sensor assembly and the seat position sensor.
    2. Using a service wire, connect J8-14 (DSP+) and J8-13 (DSP-) of connector B.
      NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      2 (LSP+) - 1 (LSP-) Always Below 1 Ω
      4. Fig 2: Checking Seat Position Sensor Circuit (For Open)
      G04830054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  10

    OK: GO TO NEXT STEP 

  4. CHECK SEAT POSITION SENSOR CIRCUIT (FOR SHORT) 
    1. Disconnect the service wire from connector B.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      2 (LSP+) -1 (LSP-) Always 1 MΩ or higher
      3. Fig 3: Checking Seat Position Sensor Circuit (For Short)
      G04830055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  11

    OK: GO TO NEXT STEP 

  5. CHECK SEAT POSITION SENSOR CIRCUIT (TO B+) 
    1. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    2. Turn the ignition switch on.
    3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      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. Fig 4: Checking Seat Position Sensor Circuit (For Short)
      G04830055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  12

    OK: GO TO NEXT STEP 

  6. CHECK SEAT POSITION SENSOR CIRCUIT (TO GROUND) 
    1. Turn the ignition switch off.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Measure the voltage.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      2 (LSP+) - Body ground Always 1 MΩ or Higher
      1 (LSP-) - Body ground Always 1 MΩ or Higher
      4. Fig 5: Checking Seat Position Sensor Circuit (For Short)
      G04830055Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: Go to step  13

    OK: GO TO NEXT STEP 

  7. CHECK SEAT POSITION SENSOR 
    1. Connect the connectors to the center airbag sensor assembly and the seat position sensor.
    2. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    3. Turn the ignition switch on and wait for at least 60 seconds.
    4. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    5. Turn the ignition switch off.
    6. Turn the ignition switch on and wait for at least 60 seconds.
    7. Check the DTCs (See DTC CHECK / CLEAR  ).

      OK: DTC B1653/35 is not output. 

      HINT:

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

      8. Fig 6: Checking DTC
      G04830053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: USE SIMULATION METHOD TO CHECK 

    NG: GO TO NEXT STEP 

  8. REPLACE SEAT POSITION SENSOR 
    1. Turn the ignition switch off.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Replace the seat position sensor (See ON-VEHICLE INSPECTION  ).

      HINT:

      Perform the inspection using parts from a normal vehicle if possible.

  9. CHECK CENTER AIRBAG SENSOR ASSEMBLY 
    1. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    2. Turn the ignition switch on and wait for at least 60 seconds.
    3. Clear the DTCs stored in the memory (See DTC CHECK / CLEAR  ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch on and wait for at least 60 seconds.
    6. Check the DTCs (See DTC CHECK / CLEAR  ).

      OK: DTC B1653/35 is not output. 

      HINT:

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

      7. Fig 7: Checking DTC
      G04830053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE CENTER AIRBAG SENSOR ASSEMBLY 

    OK: END 

  10. CHECK FLOOR WIRE (FOR OPEN) 
    1. Disconnect the connectors from the center airbag sensor assembly and the seat position sensor.
    2. Using a service wire, connect J8-14 (DSP+) and J8-13 (DSP-) of connector B.
      NOTE: Do not forcibly insert the service wire into the terminals of the connector when connecting.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J10-2 (LSP+) - J10-1 (LSP-) Always Below 1 Ω
      4. Fig 8: Checking Floor Wire (For Open)
      G04830060Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

  11. CHECK FLOOR WIRE (FOR SHORT) 
    1. Disconnect the service wire from connector B.
    2. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J10-2 (LSP+) -J10-1 (LSP-) Always 1 MΩ or higher
      3. Fig 9: Checking Floor Wire (For Short)
      G04830061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

  12. CHECK FLOOR WIRE (TO B+) 
    1. Connect the negative (-) terminal cable to the battery and wait for at least 2 seconds.
    2. Turn the ignition switch on.
    3. Measure the voltage.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J10-2 (LSP+) - Body ground Ignition switch on Below 1V
      J10-1 (LSP-) - Body ground Ignition switch on Below 1 V
      4. Fig 10: Checking Floor Wire (For Short)
      G04830061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

  13. CHECK FLOOR WIRE (TO GROUND) 
    1. Turn the ignition switch off.
    2. Disconnect the negative (-) terminal cable from the battery and wait for at least 90 seconds.
    3. Measure the resistance.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION

      Tester Connection Condition Specified Condition
      J10-2 (LSP+)-Body ground Always 1 MΩ or higher
      J10-1 (LSP-)-Body ground Always 1 MΩ or higher
      4. Fig 11: Checking Floor Wire (For Short)
      G04830061Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE FLOOR WIRE 

    OK: REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 

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