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Home >> Toyota >> 2011 >> Highlander Hybrid Limited >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 109 (Supplemental Restraint System (Diagnostic Codes & Symptom Tests)) >> Airbag System >> DTC B1656/38: Seat Belt Buckle Switch LH Circuit Malfunction >> Procedure

DTC B1656/38: Seat Belt Buckle Switch LH Circuit Malfunction: Procedure

WARNING: This page is about a different variant/trim than selected.
  1. CHECK CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Check that the connectors are properly connected to the center airbag sensor assembly and front seat inner belt assembly LH.

      OK

      The connectors are properly connected.

      HINT: 

      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 seat inner belt assembly LH.
    5. Check that the terminals of the connectors are not damaged.

      OK

      The terminals are not deformed or damaged.

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  2. CHECK NO. 2 FLOOR WIRE (OPEN) 
    1. Using SST, connect terminals 10 (LBE+) and 18 (LBE-) of connector B.
      Fig 1: Identifying No. 2 Floor Wire (Open)
      GTY298559Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      NOTE:

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

      • SST: 09843-18040 
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - O10-3 (LBE-) Always Below 1 Ω

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  3. CHECK NO. 2 FLOOR WIRE (SHORT) 
    1. Disconnect SST from connector B.
      Fig 2: Identifying No. 2 Floor Wire (Short)
      GTY301263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - O10-3 (LBE-) Always 1 MΩ or higher

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  4. CHECK NO. 2 FLOOR WIRE (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
      Fig 3: Identifying No. 2 Floor Wire (Short)
      GTY301263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      O10-1 (LBE+) - Body ground Ignition switch on (IG) Below 1 V
      O10-3 (LBE-) - Body ground Ignition switch on (IG) Below 1 V

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  5. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND) 
    1. Turn the ignition switch off.
      Fig 4: Identifying No. 2 Floor Wire (Short)
      GTY301263Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - Body ground Always 1 MΩ or higher
      O10-3 (LBE-) - Body ground Always 1 MΩ or higher

    NG → REPLACE NO. 2 FLOOR WIRE 

    OK: Go to next step 

  6. CHECK FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Connect the connectors to the center airbag sensor assembly and front seat inner belt assembly LH.
      Fig 5: Identifying Front Seat Inner Belt Assembly LH
      GTY300620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the ignition switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in the memory, refer to DTC CHECK / CLEAR .
    5. Turn the ignition switch off.
    6. Turn the ignition switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs, refer to DTC CHECK / CLEAR .

      OK

      DTC B1656/38 is not output.

      HINT: 

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.

    NG → See step   7 

    OK → See step   9 

  7. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Replace the front seat inner belt assembly LH with a known good one, refer to REMOVAL .

      HINT: 

      Perform inspection using parts from a normal vehicle if possible.

    NEXT: Go to next step 

  8. CHECK CENTER AIRBAG SENSOR ASSEMBLY 
    1. Connect the cable to the negative (-) battery terminal.
      Fig 6: Identifying Front Seat Inner Belt Assembly LH
      GTY300620Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch on (IG), and wait for at least 60 seconds.
    3. Clear the DTCs stored in the memory, refer to DTC CHECK / CLEAR .
    4. Turn the ignition switch off.
    5. Turn the ignition switch on (IG), and wait for at least 60 seconds.
    6. Check for DTCs, refer to DTC CHECK / CLEAR .

      OK

      DTC B1656/38 is not output.

      HINT: 

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.

    NG → See step   10 

    OK → END 

  9. USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING 
  10. REPLACE CENTER AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL 
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