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.

  • *1: for LHD

  • *2: for RHD

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

U122891E01

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).

  • 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.

      C299998E02

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

      Tip:

      Refer to the normal condition of the passenger airbag ON/OFF indicator (Click here).

      Table 1. Result

      Result

      Proceed to

      Always on

      A

      Off

      B

    CHECK CONNECTION OF CONNECTORSClick here

  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.

    CONNECT CONNECTORS PROPERLY

  3. CHECK CONNECTORS

    1. C206432E02

      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.

      Table 2. Text in Illustration

      *1

      Telltale Light

      *2

      Instrument Panel Wire

      *3

      Center Airbag Sensor

    REPLACE INSTRUMENT PANEL WIRE

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR

    1. C279412

      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.

    CHECK INSTRUMENT PANEL WIRE (PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT)Click here

  5. CHECK CENTER AIRBAG SENSOR

    1. C201187E04

      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.

      Tip:

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

      Table 3. Text in Illustration

      *1

      Telltale Light

      *2

      Center Airbag Sensor

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    (Click here)

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

    1. U123452E02

      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

      H122-7 (PAON) - Body ground

      Ignition switch ON

      Below 1 V

      H122-5 (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

      H122-7 (PAON) - H122-5 (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

      H122-7 (PAON) - H122-5 (P-AB)

      Always

      1 MΩ or higher

      H122-7 (PAON) - Body ground

      Always

      1 MΩ or higher

      H122-5 (P-AB) - Body ground

      Always

      1 MΩ or higher
    Table 4. Text in Illustration

    *1

    Telltale Light

    *2

    Instrument Panel Wire

    *3

    Center Airbag Sensor

    *4

    Front view of wire harness connector

    (to Telltale Light)

    *5

    Connector C

    *6

    Rear view of wire harness connector

    (to Center Airbag Sensor)

    *7

    Connector B

    *8

    Service Wire

    REPLACE TELLTALE LIGHT ASSEMBLY

    (Click here)

    REPLACE INSTRUMENT PANEL WIRE

  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.

    CONNECT CONNECTORS PROPERLY

  8. CHECK CONNECTORS

    1. C206432E02

      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.

      Table 5. Text in Illustration

      *1

      Telltale Light

      *2

      Instrument Panel Wire

      *3

      Center Airbag Sensor

    REPLACE INSTRUMENT PANEL WIRE

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

    1. U123451E02

      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

      H122-7 (PAON) - Body ground

      Ignition switch ON

      Below 1 V

      H122-5 (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

      H122-7 (PAON) - H122-5 (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

      H122-7 (PAON) - H122-5 (P-AB)

      Always

      1 MΩ or higher

      H122-7 (PAON) - Body ground

      Always

      1 MΩ or higher

      H122-5 (P-AB) - Body ground

      Always

      1 MΩ or higher
    Table 6. Text in Illustration

    *1

    Telltale Light

    *2

    Instrument Panel Wire

    *3

    Center Airbag Sensor

    *4

    Front view of wire harness connector

    (to Telltale Light)

    *5

    Connector C

    *6

    Rear view of wire harness connector

    (to Center Airbag Sensor)

    *7

    Connector B

    *8

    Service Wire

    REPLACE INSTRUMENT PANEL WIRE

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

    1. U123453E02

      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

      Tester Connection

      Switch Condition

      Specified Condition

      H122-4 (B) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 7. Text in Illustration

      *1

      Front view of wire harness connector

      (to Telltale Light)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR

    1. U122815E02

      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. 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

      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
      Table 8. Text in Illustration

      *1

      Rear view of wire harness connector

      (to Center Airbag Sensor)

    REPLACE TELLTALE LIGHT ASSEMBLY

    (Click here)

  12. CHECK CENTER AIRBAG SENSOR

    1. C201187E04

      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.

      Tip:

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

      Table 9. Text in Illustration

      *1

      Telltale Light

      *2

      Center Airbag Sensor

    USE SIMULATION METHOD TO CHECK

    (Click here)

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY

    (Click here)