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Home >> Toyota >> 2021 >> C-HR LE >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (B1627-B1656) >> Airbag System >> DTC B1651/33: Manual Cut off Switch Trouble [10/2017 - 09/2019] >> Procedure

DTC B1651/33: Manual Cut off Switch Trouble [10/2017 - 09/2019]: 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 and airbag cut off switch cylinder sub-assembly.

      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 and airbag cut off switch cylinder sub-assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    6. Check that the short springs of the activation prevention mechanism of the instrument panel wire connector are not deformed or damaged.

      OK

      The short springs are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  2

  2. CHECK INSTRUMENT PANEL WIRE (OPEN) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY755274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F64-2 (PMC+) - F64-1 (PMC-) Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  3

  3. CHECK INSTRUMENT PANEL WIRE (SHORT) 
    1. Release the activation prevention mechanism built into connector B.

      Refer to DIAGNOSIS SYSTEM [02/2017 - 09/2019]

      GTY755274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag Cut Off Switch Cylinder Sub-assembly)
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F64-2 (PMC+) - F64-1 (PMC-) Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY755274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag Cut Off Switch Cylinder Sub-assembly)
    2. Turn the ignition switch ON.
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F64-2 (PMC+) - Body ground Ignition switch ON Below 1 V
      F64-1 (PMC-) - 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: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  5

  5. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND) 
    1. Measure the resistance according to the value(s) in the table below.
      GTY755274Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag Cut Off Switch Cylinder Sub-assembly)

      Standard Resistance

      Tester Connection Condition Specified Condition
      F64-2 (PMC+) - Body ground Always 1 MΩ or higher
      F64-1 (PMC-) - Body ground Always 1 MΩ or higher
    2. Restore the released activation prevention mechanism of connector B to the original condition.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  6

  6. CHECK AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY 
    1. Measure the resistance according to the value(s) in the table below.
      GTY752002Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Component without harness connected
      (Airbag Cut Off Switch Cylinder Sub-assembly)

      Standard Resistance

      Tester Connection Switch Condition Specified Condition
      2 (PMC+) - 1 (PMC-) Cut off switch in ON position 360 to 440 Ω
      2 (PMC+) - 1 (PMC-) Cut off switch in OFF position 90 to 110 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE AIRBAG CUT OFF SWITCH CYLINDER SUB-ASSEMBLY. Refer to  REMOVAL [10/2017 - ] 

    Result: 

    OK 

    See step  7

  7. CHECK DTC 
    1. Connect the connectors to the airbag sensor assembly and airbag cut off switch cylinder sub-assembly.
      GTY447346Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Airbag Cut Off Switch Cylinder Sub-assembly
      *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 [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Clear DTCs 

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

      Refer to DTC CHECK / CLEAR [02/2017 - 09/2019]

      Body Electrical > SRS Airbag > Trouble Codes 

      OK

      DTC B1651/33 is not output.

      HINT: 

      Codes other than DTC B1651/33 may be output at this time, but they are not related to this check.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [10/2017 - 05/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [05/2018 - 09/2019] 

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [10/2017 - 09/2019] 

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