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Home >> Toyota >> 2021 >> 4Runner Trail, 4WD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (B100-B1690) >> Airbag System >> DTC B1660-43: Passenger Airbag ON/OFF Indicator Circuit Malfunction [08/2015 - 08/2018] >> Procedure

DTC B1660-43: Passenger Airbag ON/OFF Indicator Circuit Malfunction [08/2015 - 08/2018]: Procedure

  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION 
    1. Turn the ignition switch to ON.
      GTY711799Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check the passenger airbag ON/OFF indicator operation.

      HINT: 

      Refer to the normal condition of the passenger airbag ON/OFF indicator (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] ).

      RESULT

      Result Proceed to
      Always on A
      Off B

    Result: 

    B 

    See step  7

    Result: 

    A 

    See step  2

  2. CHECK CONNECTION OF 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 airbag sensor assembly and telltale light assembly.

      OK

      The connectors are properly connected.

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag sensor assembly and telltale light assembly.
    2. Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      GTY292575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly
      *2 Airbag Sensor Assembly

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Connect the connector to the telltale light assembly.
      GTY231974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    3. Turn the ignition switch to ON.
    4. Check the passenger airbag ON/OFF indicator operation.

      OK

      The passenger airbag ON/OFF indicator does not come on.

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  5

  5. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Turn the ignition switch off.
      GTY290611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Connect the connector to the airbag sensor assembly.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Turn the ignition switch to ON, and wait for at least 60 seconds.
    6. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    7. Turn the ignition switch off.
    8. Turn the ignition switch to ON, and wait for at least 60 seconds.
    9. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC B1660 is not output.

      HINT: 

      Codes other than DTC B1660 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly
      *2 Airbag Sensor Assembly

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

  6. CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR - TELLTALE LIGHT) 
    1. Turn the ignition switch off.
      GTY719085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly *2 Airbag Sensor Assembly
      *3 Connector C *4 Connector B
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Telltale Light Assembly)      		 *b Rear view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Disconnect the connectors from the airbag sensor assembly and telltale light assembly.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F32-3 (PAON) - Body ground Ignition switch ON Below 1 V
      F32-4 (P-AB) - Body ground Ignition switch ON Below 1 V
    6. Turn the ignition switch off.
    7. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    8. Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      F32-3 (PAON) - F32-4 (P-AB) Always Below 1 Ω
    10. Disconnect the service wire from connector B.
    11. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F32-3 (PAON) - F32-4 (P-AB) Always 1 MΩ or higher
      F32-3 (PAON) - Body ground Always 1 MΩ or higher
      F32-4 (P-AB) - Body ground Always 1 MΩ or higher

    Result: 

    OK 

    REPLACE TELLTALE LIGHT ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  7. CHECK CONNECTION OF 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 airbag sensor assembly and telltale light assembly.

      OK

      The connectors are properly connected.

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  8

  8. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag sensor assembly and telltale light assembly.
    2. Check that the connectors (on the airbag sensor assembly side and telltale light assembly side) are not damaged.

      OK

      The connectors are not deformed or damaged.

      GTY292575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly
      *2 Airbag Sensor Assembly

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  9

  9. CHECK INSTRUMENT PANEL WIRE (AIRBAG SENSOR - TELLTALE LIGHT) 
    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
      GTY719085Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly *2 Airbag Sensor Assembly
      *3 Connector C *4 Connector B
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Telltale Light Assembly)      		 *b Rear view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F32-3 (PAON) - Body ground Ignition switch ON Below 1 V
      F32-4 (P-AB) - Body ground Ignition switch ON Below 1 V
    3. Turn the ignition switch off.
    4. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    5. Using a service wire, connect terminals 23 (PAON) and 17 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      F32-3 (PAON) - F32-4 (P-AB) Always Below 1 Ω
    7. Disconnect the service wire from connector B.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F32-3 (PAON) - F32-4 (P-AB) Always 1 MΩ or higher
      F32-3 (PAON) - Body ground Always 1 MΩ or higher
      F32-4 (P-AB) - Body ground Always 1 MΩ or higher

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  10

  10. CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE) 
    1. Turn the ignition switch off.
      GTY739232Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the connectors to the airbag sensor assembly.
    3. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      F32-7 (IG+) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Telltale Light Assembly)

    Result: 

    NG 

    REPLACE HARNESS AND CONNECTOR (TELLTALE LIGHT - BATTERY) OR BATTERY 

    Result: 

    OK 

    See step  11

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Turn the ignition switch off.
      GTY729962Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Connect the connector to the telltale light assembly.
    4. Disconnect the connectors from the airbag sensor assembly.
    5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    6. Check the indicator according to the value(s) in the table below.

      OK

      Tester Connection Switch Condition Passenger airbag ON/OFF indicator
      F33-23 (PAON) - Body ground Ignition switch ON "ON" comes on
      F33-17 (P-AB) - Body ground Ignition switch ON "OFF" comes on
      TEXT IN ILLUSTRATION

      *a Rear view of wire harness connector
      (to Airbag Sensor Assembly)

    Result: 

    NG 

    REPLACE TELLTALE LIGHT ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

    Result: 

    OK 

    See step  12

  12. CHECK AIRBAG SENSOR ASSEMBLY 
    1. Turn the ignition switch off.
      GTY290611Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
    3. Connect the connectors to the airbag sensor assembly.
    4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
    5. Turn the ignition switch to ON, and wait for at least 60 seconds.
    6. Clear the DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).
    7. Turn the ignition switch off.
    8. Turn the ignition switch to ON, and wait for at least 60 seconds.
    9. Check for DTCs (Refer to DTC CHECK / CLEAR [08/2015 - 08/2019] ).

      OK

      DTC B1660 is not output.

      HINT: 

      Codes other than DTC B1660 may be output at this time, but they are not related to this check.

      TEXT IN ILLUSTRATION

      *1 Telltale Light Assembly
      *2 Airbag Sensor Assembly

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK 

    (Refer to DIAGNOSIS SYSTEM [08/2015 - 08/2019] )

    Result: 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    (Refer to REMOVAL [08/2015 - ] )

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