AIRBAG SYSTEM, Diagnostic DTC:B1660

DTC Code DTC Name
B1660 P Seat Airbag Active Mode Indicator

DESCRIPTION

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

The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag and front seat belt pretensioner RH.

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

DTC No. DTC Detection Condition Trouble Area
B1660

  • The airbag ECU assembly receives a line short circuit signal, 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.

  • Clock assembly malfunction

  • Airbag ECU assembly malfunction

  • Instrument panel wire

  • Clock assembly (Passenger airbag ON/OFF indicator)

  • Airbag ECU assembly

WIRING DIAGRAM

A004KU5E28

CAUTION / NOTICE / HINT

Note


  • After turning the ignition 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.

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

Tech Tips


  • Perform the simulation method by selecting check mode (Signal Check) using the GTS Click here.

  • After selecting check mode (Signal Check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on a city road or rough road Click here.

PROCEDURE


  1. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CONDITION


    1. Turn the ignition switch to ON.

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

      Result
      ON/OFF Indicator Illumination Proceed to
      Always ON A
      OFF B

      Tech Tips

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


    B

    CHECK CONNECTORS Click here

    A

  2. CHECK CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      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 and clock assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU assembly and clock assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. Connect the connector to the clock assembly.

    2. Connect the cable to the negative (-) battery terminal.

    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 (OPEN) Click here

    OK

  4. CHECK DTC


    1. A004KGEE02
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly

      Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      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. Clear the DTCs stored in memory Click here.

    6. Turn the ignition switch off.

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

    8. 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.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here

  5. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A004HP9E04
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Clock Assembly)

      Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      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 clock assembly.

    4. Using a service wire, connect terminals 23 (PAON) and 17 (PAOFF) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - D18-5 (P-AB) Always Below 1 Ω

    6. Disconnect the service wire from connector B.


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  6. CHECK INSTRUMENT PANEL WIRE (SHORT)

    A004JV3E03
    Text in Illustration
    *1 Clock Assembly
    *2 Airbag ECU Assembly
    *3 Instrument Panel Wire
    *a

    Front view of wire harness connector

    (to Clock Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - D18-5 (P-AB) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  7. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A004JV3E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - Body ground Ignition switch ON Below 1 V
      D18-5 (P-AB) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  8. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A004JV3E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - Body ground Always 1 MΩ or higher
      D18-5 (P-AB) - Body ground Always 1 MΩ or higher

    OK

    REPLACE CLOCK ASSEMBLY

    NG

    REPLACE INSTRUMENT PANEL WIRE

  9. CHECK CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      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 and clock assembly.

      OK
      The connectors are properly connected.

      Tech Tips

      If the connectors are not connected securely, reconnect the connectors and proceed to the next inspection.

    4. Disconnect the connectors from the airbag ECU assembly and clock assembly.

    5. Check that the terminals of the connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  10. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A004HP9E04
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)
      *b

      Front view of wire harness connector

      (to Clock Assembly)

      Using a service wire, connect terminals 23 (PAON) and 17 (PAOFF) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - D18-5 (P-AB) Always Below 1 Ω

    3. Disconnect the service wire from connector B.


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  11. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A004JV3E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - D18-5 (P-AB) Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  12. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A004JV3E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - Body ground Ignition switch ON Below 1 V
      D18-5 (P-AB) - Body ground Ignition switch ON Below 1 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.


    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  13. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A004JV3E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D18-3 (PAON) - Body ground Always 1 MΩ or higher
      D18-5 (P-AB) - Body ground Always 1 MΩ or higher

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

  14. CHECK CLOCK ASSEMBLY (SOURCE VOLTAGE)


    1. A004K41E03
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Clock Assembly)

      Connect the cable to the negative (-) battery terminal.

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      D18-10 (LAPB) - Body ground Ignition switch ON 11 to 14 V

    4. Turn the ignition switch off.

    5. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.


    NG

    REPLACE WIRE HARNESS OR BATTERY

    OK

  15. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. A004J2ME02
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Connect the connector to the clock assembly.

    2. Connect the cable to the negative (-) battery terminal.

    3. Turn the ignition switch to ON.

    4. Check the indicator according to the conditions in the table below.

      OK
      Terminal Connection Condition Specified Condition
      D27-23 (PAON) - Body ground Ignition switch ON "ON" comes on
      D27-17 (PAOFF) - Body ground Ignition switch ON "OFF" comes on

    5. Turn the ignition switch off.

    6. Disconnect the cable from the negative (-) battery terminal.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.


    NG

    REPLACE CLOCK ASSEMBLY

    OK

  16. CHECK DTC


    1. A004KGEE02
      Text in Illustration
      *1 Clock Assembly
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

    2. Connect the cable to the negative (-) battery terminal.

    3. Clear the DTCs stored in memory Click here.

    4. Turn the ignition switch off.

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

    6. 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.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE AIRBAG ECU ASSEMBLY Click here