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Home >> Lexus >> 2023 >> ES 350 Base >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (Except Hybrid) - Diagnostic Codes (2 Of 3) >> AIRBAG SYSTEM (for Gasoline Model) >> DTC B1660: P Seat Airbag Active Mode Indicator [06/2018 - 08/2021] >> Procedure

DTC B1660: P Seat Airbag Active Mode Indicator [06/2018 - 08/2021]: Procedure

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

      HINT: 

      Refer to the normal condition of the passenger airbag ON/OFF indicator.

      Refer to OPERATION CHECK [06/2018 - 08/2021]

      Result

      Result Proceed to
      Passenger airbag ON/OFF indicator illumination is always on. A
      Passenger airbag ON/OFF indicator illumination is always off. B

    Result: 

    B 

    See step  8

    Result: 

    A 

    See step  2

  2. CHECK CONNECTION OF CONNECTORS 
    1. Turn the engine 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 ECU assembly, multi-display assembly and instrument panel junction block assembly.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  3

  3. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly, multi-display assembly and instrument panel junction block assembly.
    2. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  4

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION 
    1. Connect the connector to the multi-display assembly and instrument panel junction block assembly.
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the engine switch on (IG).
    4. Check the passenger airbag ON/OFF indicator operation.

      OK

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

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  6

    Result: 

    OK 

    See step  5

  5. CHECK DTC 
    1. Turn the engine switch off.
      GTY470182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
    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. Connect the connector to the airbag ECU assembly.
    4. Connect the cable to the negative (-) battery terminal.
    5. Turn the engine switch on (IG), and wait for at least 60 seconds.
    6. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

    7. Turn the engine switch off.
    8. Turn the engine switch on (IG), and wait for at least 60 seconds.
    9. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      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.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    NG 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

  6. CHECK WIRE HARNESS 
    1. Turn the engine switch off.
      GTY777080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
      *4 Instrument Panel Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Multi-display Assembly)
    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. Disconnect the connector from the multi-display assembly.
    4. Connect the cable to the negative (-) battery terminal.
    5. Turn the engine switch on (IG).
    6. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G28-5 (PAON) - Body ground Engine switch on (IG) Below 1 V
      G28-6 (P-AB) - Body ground Engine switch on (IG) Below 1 V
    7. Turn the engine switch off.
    8. 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.

    9. Using a service wire, connect terminals 35 (PAON) and 34 (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
      G28-5 (PAON) - G28-6 (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
      G28-5 (PAON) - G28-6 (P-AB) Always 1 MΩ or higher
      G28-5 (PAON) - Body ground Always 1 MΩ or higher
      G28-6 (P-AB) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    NG 

    See step  7

  7. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the connector from the instrument panel junction block assembly.
      GTY823896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly *2 Airbag ECU Assembly
      *3 Multi-display Assembly *4 Instrument Panel Wire
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)      		 *b Front view of wire harness connector
      (to Airbag ECU Assembly)
      *c Front view of wire harness connector
      (to Multi-display Assembly)      		 - -
    2. Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-8 (PAON) - 3A-46 (P-AB) Always Below 1 Ω
    4. Disconnect the service wire from connector B.
    5. Using a service wire, connect terminals 5 (PAON) and 6 (P-AB) of connector E.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-29 (PAON) - 3A-51 (P-AB) Always Below 1 Ω
    7. Disconnect the service wire from connector E.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-8 (PAON) - Body ground or other terminals Always 1 MΩ or higher
      3A-29 (PAON) - Body ground or other terminals Always 1 MΩ or higher
      3A-46 (P-AB) - Body ground or other terminals Always 1 MΩ or higher
      3A-51 (P-AB) - Body ground or other terminals Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

  8. CHECK CONNECTION OF CONNECTORS 
    1. Turn the engine 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 ECU assembly, multi-display assembly and instrument panel junction block assembly.

      OK

      The connectors are properly connected.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    CONNECT CONNECTORS PROPERLY 

    Result: 

    OK 

    See step  9

  9. CHECK CONNECTORS 
    1. Disconnect the connectors from the airbag ECU assembly, multi-display assembly and instrument panel junction block assembly.
    2. Check that the terminals of the connectors are not deformed or damaged.

      OK

      The terminals are not deformed or damaged.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

    Result: 

    OK 

    See step  10

  10. CHECK WIRE HARNESS 
    1. Connect the connector to the instrument panel junction block assembly.
      GTY777080Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
      *4 Instrument Panel Wire
      *5 Service Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
      *b Front view of wire harness connector
      (to Multi-display Assembly)
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the engine switch on (IG).
    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G28-5 (PAON) - Body ground Engine switch on (IG) Below 1 V
      G28-6 (P-AB) - Body ground Engine switch on (IG) Below 1 V
    5. Turn the engine switch off.
    6. 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.

    7. Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      G28-5 (PAON) - G28-6 (P-AB) Always Below 1 Ω
    9. Disconnect the service wire from connector B.
    10. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G28-5 (PAON) - G28-6 (P-AB) Always 1 MΩ or higher
      G28-5 (PAON) - Body ground Always 1 MΩ or higher
      G28-6 (P-AB) - Body ground Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    See step  14

    Result: 

    OK 

    See step  11

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE) 
    1. Connect the cable to the negative (-) battery terminal.
      GTY824053Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Multi-display Assembly)
    2. Turn the engine switch on (IG).
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      G28-1 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
    4. Turn the engine 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 WIRE HARNESS OR BATTERY 

    Result: 

    OK 

    See step  12

  12. CHECK PASSENGER AIRBAG ON/OFF INDICATOR 
    1. Connect the connector to the multi-display assembly.
      GTY819886Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
      *4 Instrument Panel Wire
      *a Front view of wire harness connector
      (to Airbag ECU Assembly)
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the engine switch on (IG).
    4. Check the passenger airbag ON/OFF indicator according to the conditions in the table below.

      OK

      Terminal Connection Condition Specified Condition
      G64-35 (PAON) - Body ground Engine switch on (IG) "ON" comes on
      G64-34 (P-AB) - Body ground Engine switch on (IG) "OFF" comes on
    5. Turn the engine switch off.
    6. 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 MULTI-DISPLAY ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2021] 

    Result: 

    OK 

    See step  13

  13. CHECK DTC 
    1. Connect the connector to the airbag ECU assembly.
      GTY470182Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly
      *2 Airbag ECU Assembly
      *3 Multi-display Assembly
    2. Connect the cable to the negative (-) battery terminal.
    3. Turn the engine switch on (IG), and wait for at least 60 seconds.
    4. Clear the DTCs stored in memory.

      Body Electrical > SRS Airbag > Clear DTCs 

    5. Turn the engine switch off.
    6. Turn the engine switch on (IG), and wait for at least 60 seconds.
    7. Check for DTCs.

      Body Electrical > SRS Airbag > Trouble Codes 

      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.

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2018 - ] 

    Result: 

    NG 

    REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [06/2018 - 08/2020]  , or refer to  REMOVAL [08/2020 - 08/2021] 

  14. CHECK INSTRUMENT PANEL WIRE 
    1. Disconnect the connector from the instrument panel junction block assembly.
      GTY823896Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Instrument Panel Junction Block Assembly *2 Airbag ECU Assembly
      *3 Multi-display Assembly *4 Instrument Panel Wire
      *5 Service Wire - -
      *a Front view of wire harness connector
      (to Instrument Panel Junction Block Assembly)      		 *b Front view of wire harness connector
      (to Airbag ECU Assembly)
      *c Front view of wire harness connector
      (to Multi-display Assembly)      		 - -
    2. Using a service wire, connect terminals 35 (PAON) and 34 (P-AB) of connector B.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-8 (PAON) - 3A-46 (P-AB) Always Below 1 Ω
    4. Disconnect the service wire from connector B.
    5. Using a service wire, connect terminals 5 (PAON) and 6 (P-AB) of connector E.
      NOTE:

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

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

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-29 (PAON) - 3A-51 (P-AB) Always Below 1 Ω
    7. Disconnect the service wire from connector E.
    8. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      3A-8 (PAON) - Body ground or other terminals Always 1 MΩ or higher
      3A-29 (PAON) - Body ground or other terminals Always 1 MΩ or higher
      3A-46 (P-AB) - Body ground or other terminals Always 1 MΩ or higher
      3A-51 (P-AB) - Body ground or other terminals Always 1 MΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    Result: 

    NG 

    REPLACE INSTRUMENT PANEL WIRE 

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