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 telltale light assembly (passenger airbag ON/OFF indicator).

The passenger airbag ON/OFF indicator indicates the operation condition of the front passenger airbag.

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

DTC No. DTC Detection Condition Trouble Area
B1660/43
  • 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.

  • Telltale light assembly malfunction

  • Airbag ECU assembly malfunction


  • Instrument panel wire

  • No. 2 Instrument panel wire

  • No. 5 Instrument panel wire

  • Telltale light assembly (Passenger airbag ON/OFF indicator)

  • Airbag ECU assembly

WIRING DIAGRAM

A00421FE03

INSPECTION PROCEDURE

Note


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

    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
    A
  2. CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly. Also check that the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire are properly connected.

      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 telltale light assembly. Also disconnect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.

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

      OK
      The terminals are not deformed or damaged.

    NG
    OK
  3. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. Connect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.

    2. Connect the connector to the telltale light assembly.

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

    4. Turn the power switch on (IG).

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

      OK
      The passenger airbag ON/OFF indicator does not come on.

    NG
    OK
  4. CHECK DTC


    1. A0041WCE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly

      Turn the power switch off.

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

      CAUTION:

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

    3. Connect the connector to the airbag ECU assembly.

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

    5. Clear the DTCs stored in memory Click here.

    6. Turn the power switch off.

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

    8. 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.


    NG
    OK
  5. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (OPEN)


    1. A0041Z3E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      *b

      Front view of wire harness connector

      (to Telltale Light Assembly)

      Turn the power switch off.

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

      CAUTION:

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

    3. Disconnect the connector from the telltale light assembly.

    4. Using a service wire, connect terminals 23 (PAON) and 17 (P-A/B) 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
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - M1-5 (P-AB) Always Below 1 Ω
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - M2-5 (P-AB) Always Below 1 Ω

    NG
    OK
  6. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - M1-5 (P-AB) Always 1 MΩ or higher
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - M2-5 (P-AB) Always 1 MΩ or higher

    NG
    OK
  7. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO B+)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - Body ground Power switch on (IG) Below 1 V
      M1-5 (P-AB) - Body ground Power switch on (IG) Below 1 V
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - Body ground Power switch on (IG) Below 1 V
      M2-5 (P-AB) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.

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

      CAUTION:

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


    NG
    OK
  8. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO GROUND)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - Body ground Always 1 MΩ or higher
      M1-5 (P-AB) - Body ground Always 1 MΩ or higher
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - Body ground Always 1 MΩ or higher
      M2-5 (P-AB) - Body ground Always 1 MΩ or higher

    NG
    OK
  9. CHECK CONNECTORS


    1. Turn the power switch off.

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

      CAUTION:

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

    3. Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly. Also check that the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire are properly connected.

      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 telltale light assembly. Also disconnect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.

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

      OK
      The terminals are not deformed or damaged.

    NG
    OK
  10. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (OPEN)


    1. A0041Z3E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      *b

      Front view of wire harness connector

      (to Telltale Light Assembly)

      Connect the connectors that link the instrument panel wire, No. 2 instrument panel wire and No. 5 instrument panel wire.

    2. Using a service wire, connect terminals 23 (PAON) and 17 (P-A/B) of connector B.

      Note

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

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

      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - M1-5 (P-AB) Always Below 1 Ω
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - M2-5 (P-AB) Always Below 1 Ω

    NG
    OK
  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

      Disconnect the service wire from connector B.

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

      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - M1-5 (P-AB) Always 1 MΩ or higher
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - M2-5 (P-AB) Always 1 MΩ or higher

    NG
    OK
  12. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO B+)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - Body ground Power switch on (IG) Below 1 V
      M1-5 (P-AB) - Body ground Power switch on (IG) Below 1 V
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - Body ground Power switch on (IG) Below 1 V
      M2-5 (P-AB) - Body ground Power switch on (IG) Below 1 V
    4. Turn the power switch off.

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

      CAUTION:

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


    NG
    OK
  13. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT (SHORT TO GROUND)


    1. A0043A8E03
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

      Standard Resistance
      for RHD:
      Tester Connection Condition Specified Condition
      M1-1 (PAON) - Body ground Always 1 MΩ or higher
      M1-5 (P-AB) - Body ground Always 1 MΩ or higher
      for LHD:
      Tester Connection Condition Specified Condition
      M2-1 (PAON) - Body ground Always 1 MΩ or higher
      M2-5 (P-AB) - Body ground Always 1 MΩ or higher

    NG
    OK
  14. CHECK TELLTALE LIGHT ASSEMBLY (SOURCE VOLTAGE)


    1. A0043A8E04
      Text in Illustration
      *A for RHD
      *B for LHD
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      for RHD:
      Tester Connection Condition Specified Condition
      M1-6 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      for LHD:
      Tester Connection Condition Specified Condition
      M2-6 (IG+) - Body ground Power switch on (IG) 11 to 14 V
    4. Turn the power switch off.

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

      CAUTION:

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


    NG
    OK
  15. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. A0040R9E02
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Connect the connector to the telltale light assembly.

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

    3. Turn the power switch on (IG).

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

      Result
      Terminal Connection Condition Specified Condition
      L13-23 (PAON) - Body ground Power switch on (IG) "ON" comes on
      L13-17 (P-A/B) - Body ground Power switch on (IG) "OFF" comes on
    5. Turn the power switch off.

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

      CAUTION:

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


    NG
    OK
  16. CHECK DTC


    1. A0041WCE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly

      Connect the connector to the airbag ECU assembly.

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

    3. Clear the DTCs stored in memory Click here.

    4. Turn the power switch off.

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

    6. 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.


    NG
    OK
  17. CHECK INSTRUMENT PANEL WIRE (OPEN)


    1. A0043V7E02
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *5 Service Wire
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      *b

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

      Disconnect the instrument panel wire from the No. 2 instrument panel wire.

      Tech Tips

      The service wire has already been inserted into connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LI2-2 (PAON) - LI2-14 (P-AB) Always Below 1 Ω
    3. Disconnect the service wire from connector B.


    NG
    OK
  18. CHECK NO. 2 INSTRUMENT PANEL WIRE (OPEN)


    1. A00425SE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 5 Instrument Panel Wire
      *4 No. 2 Instrument Panel Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Instrument Panel Wire)

      *b

      Front view of wire harness connector

      (to No. 5 Instrument Panel Wire)

      Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.

    2. Using a service wire, connect terminals 2 (PAON) and 14 (P-AB) of connector D.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IM1-8 (PAON) - IM1-7 (P-AB) Always Below 1 Ω
    4. Disconnect the service wire from connector D.


    NG
    OK
  19. CHECK INSTRUMENT PANEL WIRE (SHORT)


    1. A0041T1E01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

      Disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LI2-2 (PAON) - LI2-14 (P-AB) Always 1 MΩ or higher

    NG
    OK
  20. CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT)


    1. A0042ZRE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 5 Instrument Panel Wire
      *4 No. 2 Instrument Panel Wire
      *5 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 5 Instrument Panel Wire)

      Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IM1-8 (PAON) - IM1-7 (P-AB) Always 1 MΩ or higher

    NG
    OK
  21. CHECK INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A0041T1E01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

      Disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      LI2-2 (PAON) - Body ground Power switch on (IG) Below 1 V
      LI2-14 (P-AB) - Body ground Power switch on (IG) Below 1 V
    5. Turn the power switch off.

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

      CAUTION:

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


    NG
    OK
  22. CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT TO B+)


    1. A0042ZRE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 5 Instrument Panel Wire
      *4 No. 2 Instrument Panel Wire
      *5 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 5 Instrument Panel Wire)

      Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.

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

    3. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      IM1-8 (PAON) - Body ground Power switch on (IG) Below 1 V
      IM1-7 (P-AB) - Body ground Power switch on (IG) Below 1 V

    NG
    OK
  23. CHECK INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A0041T1E01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 2 Instrument Panel Wire
      *4 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 2 Instrument Panel Wire)

      Disconnect the instrument panel wire from the No. 2 instrument panel wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      LI2-2 (PAON) - Body ground Always 1 MΩ or higher
      LI2-14 (P-AB) - Body ground Always 1 MΩ or higher

    NG
    OK
  24. CHECK NO. 2 INSTRUMENT PANEL WIRE (SHORT TO GROUND)


    1. A0042ZRE01
      Text in Illustration
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 No. 5 Instrument Panel Wire
      *4 No. 2 Instrument Panel Wire
      *5 Instrument Panel Wire
      *a

      Front view of wire harness connector

      (to No. 5 Instrument Panel Wire)

      Disconnect the No. 2 instrument panel wire from the No. 5 instrument panel wire.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      IM1-8 (PAON) - Body ground Always 1 MΩ or higher
      IM1-7 (P-AB) - Body ground Always 1 MΩ or higher

    NG
    OK