AIRBAG SYSTEM, Diagnostic DTC:B1660/43

DTC Code DTC Name
B1660/43 Passenger Airbag ON/OFF Indicator Circuit Malfunction

DESCRIPTION

The passenger airbag ON/OFF indicator circuit consists of the airbag ECU assembly and passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag assembly and front seat airbag assembly RH and LH.

DTC B1660/43 is stored when a malfunction is detected in the passenger airbag ON/OFF indicator circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1660/43 Passenger Airbag ON/OFF Indicator Circuit Malfunction

One of the following conditions is met:


  • The airbag ECU assembly detects an open circuit signal, short circuit to ground signal or short circuit to B+ signal in the passenger airbag ON/OFF indicator circuit for 2 seconds.

  • A passenger airbag ON/OFF indicator malfunction.

  • An airbag ECU assembly malfunction.

  • Harness and connector

  • Air conditioning control assembly

  • Airbag ECU assembly

WIRING DIAGRAM

B008HJ6E01

CAUTION / NOTICE / HINT

Note


  • After turning the engine switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here

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.

      Tech Tips

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

      Click here

      B008JGQE09
      Result
      ON/OFF Indicator Illumination Proceed to
      One or both indicators are always on A
      Both indicators are always off B

    B

    CHECK CONNECTION OF CONNECTORS Click here

    A

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine 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 ECU assembly and air conditioning control assembly.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  3. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag ECU assembly and air conditioning control assembly.

    2. B008H6JC07
      *1 Air Conditioning Control Assembly
      *2 Airbag ECU Assembly

      Check that the connectors (on the airbag ECU assembly side and air conditioning control assembly side) are not damaged.

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged

    REPLACE HARNESS AND CONNECTOR

    The connectors are not deformed or damaged

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. B008IYXC01
      *A w/o Occupant Classification System
      *B w/ Occupant Classification System

      Connect the connector to the air conditioning control assembly.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the engine switch on (IG).

    4. Check the passenger airbag ON/OFF indicator operation.

      Result
      Proceed to
      The passenger airbag ON/OFF indicator does not come on
      The passenger airbag ON/OFF indicator comes on

    The passenger airbag ON/OFF indicator comes on

    CHECK HARNESS AND CONNECTOR Click here

    The passenger airbag ON/OFF indicator does not come on

  5. CHECK DTC


    1. B008IYOC01
      *1 Air Conditioning Control Assembly
      *2 Airbag ECU Assembly

      Connect the connectors to the airbag ECU assembly.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the engine switch on (IG), and wait for at least 60 seconds.

    4. Clear the DTCs.

      Click here


      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.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1660/43 is not output
      DTC B1660/43 is output

      Tech Tips

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


    DTC B1660/43 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1660/43 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

  6. CHECK HARNESS AND CONNECTOR


    1. Disconnect the connector from the air conditioning control assembly.

      B008I66C04
      *1 Air Conditioning Control Assembly *2 Airbag ECU Assembly
      *3 Connector C *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the engine switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      I13-12 (P-AB) - Body ground Engine switch on (IG) Below 1 V
      I13-13 (PAON) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

    6. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    7. 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.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I13-12 (P-AB) - I13-13 (PAON) 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
      I13-12 (P-AB) - I13-13 (PAON) Always 1 MΩ or higher
      I13-12 (P-AB) - Body ground Always 1 MΩ or higher
      I13-13 (PAON) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    NG

    REPLACE HARNESS AND CONNECTOR

  7. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine 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 ECU assembly and air conditioning control assembly.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  8. CHECK CONNECTORS


    1. Disconnect the connectors from the airbag ECU assembly and air conditioning control assembly.

    2. B008H6JC08
      *1 Air Conditioning Control Assembly
      *2 Airbag ECU Assembly

      Check that the connectors (on the airbag ECU assembly side and air conditioning control assembly side) are not damaged.

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged

    REPLACE HARNESS AND CONNECTOR

    The connectors are not deformed or damaged

  9. CHECK HARNESS AND CONNECTOR


    1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

      B008I66C01
      *1 Air Conditioning Control Assembly *2 Airbag ECU Assembly
      *3 Connector C *4 Connector B
      *5 Service Wire - -
      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      		 *b

      Rear view of wire harness connector

      (to Airbag ECU 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 Switch Condition Specified Condition
      I13-12 (P-AB) - Body ground Engine switch on (IG) Below 1 V
      I13-13 (PAON) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

    5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    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 a service wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I13-12 (P-AB) - I13-13 (PAON) 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
      I13-12 (P-AB) - I13-13 (PAON) Always 1 MΩ or higher
      I13-12(P-AB) - Body ground Always 1 MΩ or higher
      I13-13 (PAON) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE HARNESS AND CONNECTOR

    OK

  10. CHECK PASSENGER AIRBAG ON/OFF INDICATOR (SOURCE VOLTAGE)


    1. B008J7PC08
      *a

      Front view of wire harness connector

      (to Air Conditioning Control Assembly)

      Connect the connectors to the airbag ECU assembly.

    2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    3. Turn the engine switch on (IG).

    4. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      w/ Stop and Start System
      Tester Connection Switch Condition Specified Condition
      I13-8 (IG+) - Body ground Engine switch on (IG) 11 to 14 V
      w/o Stop and Start System
      Tester Connection Switch Condition Specified Condition
      I13-8 (IG+) - Body ground Engine switch on (IG) 10.5 to 16 V
      Result
      Proceed to
      OK
      NG (w/ Stop and Start System)
      NG (w/o Stop and Start System)

    NG (w/ Stop and Start System)

    GO TO STOP AND START SYSTEM Click here

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. B008IVIC03
      *a

      Rear view of wire harness connector

      (to Airbag ECU Assembly)

      Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Connect the connector to the air conditioning control assembly.

    4. Disconnect the connectors from the airbag ECU assembly.

    5. Using a service wire, connect terminal 23 (PAON) and body ground.

    6. Using a service wire, connect terminal 17 (P-AB) and body ground.

    7. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.

    8. Turn the engine switch on (IG).

    9. Check the indicator according to the table below.

      OK
      Tester Connection Switch Condition Passenger Airbag ON/OFF Indicator
      I58-23 (PAON) - Body ground Engine switch on (IG) "ON" comes on
      I58-17 (P-AB) - Body ground Engine switch on (IG) "OFF" comes on

    10. Disconnect the service wire from airbag ECU assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE AIR CONDITIONING CONTROL ASSEMBLY Click here

    OK

  12. CHECK DTC


    1. B008IYOC02
      *1 Air Conditioning Control Assembly
      *2 Airbag ECU Assembly

      Turn the engine switch off.

    2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

    3. Connect the connectors to the airbag ECU assembly.

    4. Connect the cable to the negative (-) battery terminal and wait for at least 2 seconds.

    5. Turn the engine switch on (IG), and wait for at least 60 seconds.

    6. Clear the DTCs.

      Click here


      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.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1660/43 is not output
      DTC B1660/43 is output

      Tech Tips

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


    DTC B1660/43 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1660/43 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here