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Home >> Toyota >> 2018 >> Prius C Three >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Supplemental Restraint System - Diagnostic Codes (3 Of 3) & Symptom Tests >> Airbag System >> DTC B1660/43: Passenger Airbag ON/OFF Indicator Circuit Malfunction [06/2017 - ] >> Procedure

DTC B1660/43: Passenger Airbag ON/OFF Indicator Circuit Malfunction [06/2017 - ]: Procedure

  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION 
    1. Turn the ignition switch to ON (IG).
    2. Check the passenger airbag ON/OFF indicator operation.

      Result

      ON/OFF Indicator Illumination Proceed to
      Always ON A
      OFF B

      HINT: 

      Refer to the normal condition of the passenger airbag ON/OFF indicator DIAGNOSIS SYSTEM [06/2017 - ] ).

    4 

    B 

    See step  6

    4 

    A 

    See step  2

  2. CHECK CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and combination meter 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 combination meter assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    4 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    4 

    OK 

    See step  3

  3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Connect the connector to the combination meter assembly.
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the ignition switch to ON (IG).
    4. Check the passenger airbag ON/OFF indicator operation.

      OK

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

    4 

    NG 

    See step  5

    4 

    OK 

    See step  4

  4. CHECK DTC 
    1. Turn the ignition switch off.
      GTY495054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Connect the connector to the airbag sensor assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    6. Turn the ignition switch off.
    7. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.
    8. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      OK

      DTC B1660/43 is not output.

      HINT: 

      Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

    4 

    OK 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    4 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

  5. CHECK INSTRUMENT PANEL WIRE 
    1. Turn the ignition switch off.
      GTY771298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Disconnect the connector from the combination meter assembly.
    4. Connect the cable to the negative (-) auxiliary battery terminal.
    5. Turn the ignition switch to ON (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - Body ground Ignition switch ON (IG) Below 1 V
      G1-4 (P-AB) - Body ground Ignition switch ON (IG) Below 1 V
    7. Turn the ignition switch off.
    8. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    9. 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 the wire.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - G1-4 (P-AB) Always Below 1 Ω
    11. Disconnect the service wire from connector B.
    12. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - G1-4 (P-AB) Always 1 MΩ or higher
      G1-3 (PAON) - Body ground Always 1 MΩ or higher
      G1-4 (P-AB) - Body ground Always 1 MΩ or higher

    4 

    OK 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    4 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  6. CHECK CONNECTORS 
    1. Turn the ignition switch off.
    2. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    3. Check that the connectors are properly connected to the airbag sensor assembly and combination meter 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 combination meter assembly.
    5. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

    4 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    4 

    OK 

    See step  7

  7. CHECK INSTRUMENT PANEL WIRE 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY771298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
      *b Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Turn the ignition switch to ON (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - Body ground Ignition switch ON (IG) Below 1 V
      G1-4 (P-AB) - Body ground Ignition switch ON (IG) Below 1 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    6. 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 the wire.

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - G1-4 (P-AB) Always Below 1 Ω
    8. Disconnect the service wire from connector B.
    9. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G1-3 (PAON) - G1-4 (P-AB) Always 1 MΩ or higher
      G1-3 (PAON) - Body ground Always 1 MΩ or higher
      G1-4 (P-AB) - Body ground Always 1 MΩ or higher

    4 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    4 

    OK 

    See step  8

  8. CHECK COMBINATION METER ASSEMBLY (SOURCE VOLTAGE) 
    1. Connect the cable to the negative (-) auxiliary battery terminal.
      GTY759499Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Combination Meter Assembly)
    2. Turn the ignition switch to ON (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G1-21 (IG+) - Body ground Ignition switch ON (IG) 11 to 14 V
    4. Turn the ignition switch off.
    5. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    4 

    NG 

    REPLACE WIRE HARNESS OR AUXILIARY BATTERY 

    4 

    OK 

    See step  9

  9. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Connect the connector to the combination meter assembly.
      GTY746105Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
      *3 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag Sensor Assembly)
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Turn the ignition switch to ON (IG).
    4. Check the indicator according to the conditions in the table below.

      OK

      Terminal Connection Condition Specified Condition
      G18-23 (PAON) - Body ground Ignition switch ON (IG) "ON" comes on
      G18-17 (P-AB) - Body ground Ignition switch ON (IG) "OFF" comes on
    5. Turn the ignition switch off.
    6. Disconnect the cable from the negative (-) auxiliary battery terminal.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

    4 

    NG 

    REPLACE COMBINATION METER ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

    4 

    OK 

    See step  10

  10. CHECK DTC 
    1. Connect the connector to the airbag sensor assembly.
      GTY495054Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Combination Meter Assembly
      *2 Airbag Sensor Assembly
    2. Connect the cable to the negative (-) auxiliary battery terminal.
    3. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [11/2015 - ] ).
    4. Turn the ignition switch off.
    5. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.
    6. Check for DTCs (Refer to DTC CHECK / CLEAR [11/2015 - ] ).

      OK

      DTC B1660/43 is not output.

      HINT: 

      Codes other than DTC B1660/43 may be output at this time, but they are not related to this check.

    4 

    OK 

    USE SIMULATION METHOD TO CHECK 

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [11/2015 - ] )

    4 

    NG 

    REPLACE AIRBAG SENSOR ASSEMBLY 

    Refer to REMOVAL [11/2015 - ] )

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