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 center airbag sensor assembly and passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag, front seat side airbag assembly RH*1 or LH*2 and front seat outer belt assembly RH*1 or LH*2.

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


DTC Code DTC Detection Condition Trouble Area
B1660/43

One of the following conditions is met:


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

  • A passenger airbag ON/OFF indicator malfunction.

  • A center airbag sensor assembly malfunction.

  • Instrument panel wire

  • Telltale light assembly

  • Center airbag sensor assembly

WIRING DIAGRAM

A004T4PE05
*a from ECU-IG NO. 2 Fuse
*b Telltale Light Assembly
*c Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice 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.

Tech Tips

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION

    A004PWAE09

    1. Turn the ignition switch to ON.

    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.

      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 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 center airbag sensor assembly and the telltale light assembly.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. A004MSYE04
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Center Airbag Sensor Assembly

      Disconnect the connectors from the center airbag sensor assembly and telltale light assembly.

    2. Check that the connectors (on the center airbag sensor assembly side and telltale light assembly side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR

    A004R44

    1. Connect the connector to the telltale light assembly.

    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.

    NG

    CHECK INSTRUMENT PANEL WIRE Click here

    OK

  5. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A004T7PE01
    Text in Illustration
    *1 Telltale Light Assembly
    *2 Center Airbag Sensor Assembly

    1. Connect the connector to the center airbag sensor.

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

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1660/43 is not output.

      Tech Tips

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


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

  6. CHECK INSTRUMENT PANEL WIRE


    1. A004MRWE02
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly
      *4 Connector C
      *5 Connector B
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)
      *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Turn the ignition switch off.

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

    3. Disconnect the connectors from the center airbag sensor and telltale light.

    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
      D135-7 (PAON) - Body ground Ignition switch ON Below 1 V
      D135-5 (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
      D135-7 (PAON) - D135-5 (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
      D135-7 (PAON) - D135-5 (P-AB) Always 1 MΩ or higher
      D135-7 (PAON) - Body ground Always 1 MΩ or higher
      D135-5 (P-AB) - Body ground Always 1 MΩ or higher

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE

  7. CHECK CONNECTION OF CONNECTORS


    1. A004MSYE03
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor Assembly

      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 center airbag sensor assembly and telltale light assembly.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  8. CHECK CONNECTORS


    1. Disconnect the connectors from the center airbag sensor assembly and telltale light assembly.

    2. Check that the connectors (on the center airbag sensor side and telltale light side) are not damaged.

      OK
      The connectors are not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  9. CHECK INSTRUMENT PANEL WIRE


    1. A004QM2E02
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor assembly
      *4 Connector C
      *5 Connector B
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)
      *b

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D135-7 (PAON) - Body ground Ignition switch ON Below 1 V
      D135-5 (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
      D135-7 (PAON) - D135-5 (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
      D135-7 (PAON) - D135-5 (P-AB) Always 1 MΩ or higher
      D135-7 (PAON) - Body ground Always 1 MΩ or higher
      D135-5 (P-AB) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

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


    1. A004U5GE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

      Turn the ignition switch off.

    2. Connect the connectors to the center 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
      D135-4 (B) - Body ground Ignition switch ON 11 to 14 V

    NG

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

    OK

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. A004MOEE01
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Center Airbag Sensor Assembly)

      Turn the ignition switch off.

    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 connector from the center airbag sensor 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 ignition switch to ON.

    9. Check the indicator according to the table below.

      OK
      Tester Connection Switch Condition Passenger airbag ON/OFF indicator
      D10-23 (PAON) - Body ground Ignition switch ON "ON" indicator comes on
      D10-17 (P-AB) - Body ground Ignition switch ON "OFF" indicator comes on

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  12. CHECK CENTER AIRBAG SENSOR ASSEMBLY

    A004T7PE01
    Text in Illustration
    *1 Telltale Light Assembly
    *2 Center Airbag Sensor Assembly

    1. Turn the ignition switch off.

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

    3. Connect the connectors to the center airbag sensor.

    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 Click here.

    7. Turn the ignition switch off.

    8. Turn the ignition switch to ON, and wait for at least 60 seconds.

    9. Check for DTCs Click here.

      OK
      DTC B1660/43 is not output.

      Tech Tips

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


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here