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 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 RH*1 or LH*2 and front seat outer belt 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 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 malfunction.

  • Instrument panel wire

  • Telltale light assembly

  • Center airbag sensor assembly

WIRING DIAGRAM

A01IQ0PE03

INSPECTION PROCEDURE

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.

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

PROCEDURE


  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION


    1. Turn the ignition switch to ON.

      A01IQOGE58

    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
      Result Proceed to
      Always on A
      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 and the telltale light.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  3. CHECK CONNECTORS


    1. A01ITDWE01
      Text in Illustration
      *1 Telltale Light
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor

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

    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

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. A01IPBGE02
      Text in Illustration
      *1 w/o TOYOTA Parking Assist-sensor System
      *2 w/ TOYOTA Parking Assist-sensor System

      Connect the connector to the telltale light.

    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 (PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT) Click here

    OK

  5. CHECK CENTER AIRBAG SENSOR


    1. A01ISSLE02
      Text in Illustration
      *1 Telltale Light
      *2 Center Airbag Sensor

      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 is not output.

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  6. CHECK INSTRUMENT PANEL WIRE (PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT)


    1. A01INBCE01
      Text in Illustration
      *1 Telltale Light
      *2 Center Airbag Sensor
      *3

      Front view of wire harness connector

      (to Telltale Light [w/o TOYOTA Parking Assist-sensor System])
      *4 Connector C
      *5

      Front view of wire harness connector

      (to Telltale Light [w/ TOYOTA Parking Assist-sensor System])
      *6

      Rear view of wire harness connector

      (to Center Airbag Sensor)
      *7 Connector B
      *8 Service Wire

      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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H67-7 (PAON) - Body ground Ignition switch ON Below 1 V
      H67-6 (P-AB) - Body ground Ignition switch ON Below 1 V
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H98-7 (PAON) - Body ground Ignition switch ON Below 1 V
      H98-5 (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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H67-7 (PAON) - H67-6 (P-AB) Always Below 1 Ω
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H98-7 (PAON) - H98-5 (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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H67-7 (PAON) - H67-6 (P-AB) Always 1 MΩ or higher
      H67-7 (PAON) - Body ground Always 1 MΩ or higher
      H67-6 (P-AB) - Body ground Always 1 MΩ or higher
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H98-7 (PAON) - H98-5 (P-AB) Always 1 MΩ or higher
      H98-7 (PAON) - Body ground Always 1 MΩ or higher
      H98-5 (P-AB) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

  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 center airbag sensor and telltale light.

      OK
      The connectors are properly connected.

    NG

    CONNECT CONNECTORS PROPERLY

    OK

  8. CHECK CONNECTORS


    1. A01ITDWE01
      Text in Illustration
      *1 Telltale Light
      *2 Instrument Panel Wire
      *3 Center Airbag Sensor

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

    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 (PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT)


    1. A01INBCE01
      Text in Illustration
      *1 Telltale Light
      *2 Center Airbag Sensor
      *3

      Front view of wire harness connector

      (to Telltale Light [w/o TOYOTA Parking Assist-sensor System])
      *4 Connector C
      *5

      Front view of wire harness connector

      (to Telltale Light [w/ TOYOTA Parking Assist-sensor System])
      *6

      Rear view of wire harness connector

      (to Center Airbag Sensor)
      *7 Connector B
      *8 Service Wire

      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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H67-7 (PAON) - Body ground Ignition switch ON Below 1 V
      H67-6 (P-AB) - Body ground Ignition switch ON Below 1 V
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H98-7 (PAON) - Body ground Ignition switch ON Below 1 V
      H98-5 (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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H67-7 (PAON) - H67-6 (P-AB) Always Below 1 Ω
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H98-7 (PAON) - H98-5 (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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H67-7 (PAON) - H67-6 (P-AB) Always 1 MΩ or higher
      H67-7 (PAON) - Body ground Always 1 MΩ or higher
      H67-6 (P-AB) - Body ground Always 1 MΩ or higher
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Condition Specified Condition
      H98-7 (PAON) - H67-5 (P-AB) Always 1 MΩ or higher
      H98-7 (PAON) - Body ground Always 1 MΩ or higher
      H98-5 (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. A01IRSTE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Telltale Light [w/o TOYOTA Parking Assist-sensor System])
      *2

      Front view of wire harness connector

      (to Telltale Light [w/ TOYOTA Parking Assist-sensor System])

      Turn the ignition switch off.

    2. Connect the connectors to the center airbag sensor.

    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
      w/o TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H67-4 (B) - Body ground Ignition switch ON 11 to 14 V
      w/ TOYOTA Parking Assist-sensor System
      Tester Connection Switch Condition Specified Condition
      H98-4 (B) - Body ground Ignition switch ON 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. A01IQ77E03
      Text in Illustration
      *1

      Rear view of wire harness connector

      (to Center Airbag Sensor)

      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.

    4. Disconnect the connector from the center airbag sensor.

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

    6. Check the indicator according to the table below.

      OK
      Tester Connection Switch Condition Passenger airbag ON/OFF indicator
      H19-23 (PAON) - Body ground Ignition switch ON "ON" indicator comes on
      H19-17 (P-AB) - Body ground Ignition switch ON "OFF" indicator comes on

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  12. CHECK CENTER AIRBAG SENSOR


    1. A01ISSLE02
      Text in Illustration
      *1 Telltale Light
      *2 Center Airbag Sensor

      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 is not output.

      Tech Tips

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


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here