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 passenger airbag ON/OFF indicator.

The passenger airbag ON/OFF indicator indicates the operation condition of the instrument panel passenger airbag assembly and lower No. 2 instrument panel airbag assembly.

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

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1660/43 Passenger Airbag ON/OFF Indicator Circuit Malfunction

One of the following conditions is met:


  • The airbag ECU assembly detects a line short, short to ground or B+, or an open in the passenger airbag ON/OFF indicator circuit.

  • A passenger airbag ON/OFF indicator malfunction

  • An airbag ECU assembly malfunction

  • Instrument panel wire

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

  • Airbag ECU assembly

 Comes on Not applicable

WIRING DIAGRAM

B004ANBE17
*a from IG1 D NO.4 Fuse
*b Telltale Light Assembly (Passenger Airbag ON/OFF Indicator)
*c Airbag ECU Assembly

CAUTION / NOTICE / HINT

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

  • When disconnecting the cable from the negative (-) auxiliary battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

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.

      Tech Tips

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

      Click here

      Result
      Result Proceed to
      ON/OFF indicator illumination is always on. A
      ON/OFF indicator illumination is always off. B

    B

    CHECK CONNECTION OF CONNECTORS Click here

    A

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

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

    3. Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  3. CHECK CONNECTORS


    1. B004A2IC09
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire

      Disconnect the connectors from the airbag ECU assembly and telltale light assembly.

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged

    REPLACE INSTRUMENT PANEL WIRE

    The connectors are not deformed or damaged

  4. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. Connect the connector to the telltale light assembly.

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

    3. Turn the power switch on (IG).

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

      Result
      Proceed to
      The passenger airbag ON/OFF indicator does not come on
      The passenger airbag ON/OFF indicator comes on

    The passenger airbag ON/OFF indicator comes on

    CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT Click here

    The passenger airbag ON/OFF indicator does not come on

  5. CHECK DTC


    1. B004AFXC07
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly

      Turn the power switch off.

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

    3. Connect the connectors to the airbag ECU assembly.

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

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

    6. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    7. Turn the power switch off.

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

    9. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1660/43 is not output
      DTC B1660/43 is output

      Tech Tips

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


    DTC B1660/43 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1660/43 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

  6. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT


    1. B004BZRC01
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)
      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Turn the power switch off.

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

    3. Disconnect the connector from the telltale light assembly.

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

    5. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P88-6 (P-AB) - Body ground Power switch on (IG) Below 1 V
      P88-5 (PAON) - Body ground Power switch on (IG) Below 1 V

    7. Turn the power switch off.

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

    9. Using a service wire, connect terminals 34 (P-AB) and 35 (PAON) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P88-6 (P-AB) - P88-5 (PAON) Always Below 1 Ω

    11. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P88-6 (P-AB) - P88-5 (PAON) Always 1 MΩ or higher
      P88-6 (P-AB) - Body ground Always 1 MΩ or higher
      P88-5 (PAON) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    NG

    REPLACE INSTRUMENT PANEL WIRE

  7. CHECK CONNECTION OF CONNECTORS


    1. Turn the power switch off.

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

    3. Check that the connectors are properly connected to the airbag ECU assembly and telltale light assembly.

      Result
      Proceed to
      The connectors are properly connected
      The connectors are not properly connected

    The connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    The connectors are properly connected

  8. CHECK CONNECTORS


    1. B004A2IC09
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire

      Disconnect the connectors from the airbag ECU assembly and telltale light assembly.

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

      Result
      Proceed to
      The connectors are not deformed or damaged
      The connectors are deformed or damaged

    The connectors are deformed or damaged

    REPLACE INSTRUMENT PANEL WIRE

    The connectors are not deformed or damaged

  9. CHECK PASSENGER AIRBAG ON/OFF INDICATOR CIRCUIT


    1. B004BZRC01
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly
      *3 Instrument Panel Wire
      *4 Service Wire
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)
      *b

      Front view of wire harness connector

      (to Airbag ECU Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P88-6 (P-AB) - Body ground Power switch on (IG) Below 1 V
      P88-5 (PAON) - 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, and wait for at least 90 seconds.

    6. Using a service wire, connect terminals 34 (P-AB) and 35 (PAON) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P88-6 (P-AB) - P88-5 (PAON) Always Below 1 Ω

    8. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P88-6 (P-AB) - P88-5 (PAON) Always 1 MΩ or higher
      P88-6 (P-AB) - Body ground Always 1 MΩ or higher
      P88-5 (PAON) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE INSTRUMENT PANEL WIRE

    OK

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


    1. B004BCNC01
      *a

      Front view of wire harness connector

      (to Telltale Light Assembly)

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

    2. Turn the power switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      P88-1 (IG+) - Body ground Power switch on (IG) 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK PASSENGER AIRBAG ON/OFF INDICATOR


    1. B004BJGC03
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Turn the power switch off.

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

    3. Connect the connector to the telltale light assembly.

    4. Using a service wire, connect terminal 35 (PAON) and body ground.

    5. Using a service wire, connect terminal 34 (P-AB) and body ground.

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

    7. Turn the power switch on (IG).

    8. Check the indicator according to the table below.

      OK
      Tester Connection Switch Condition Passenger Airbag ON/OFF Indicator
      P6-35 (PAON) - Body ground Power switch on (IG) "ON" comes on
      P6-34 (P-AB) - Body ground Power switch on (IG) "OFF" comes on
    9. B004BJGC03
      *a

      Front view of wire harness connector

      (to Airbag ECU Assembly)

      Turn the power switch off.

    10. Disconnect the service wire from airbag ECU assembly.

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE TELLTALE LIGHT ASSEMBLY Click here

    OK

  12. CHECK DTC


    1. B004AFXC07
      *1 Telltale Light Assembly
      *2 Airbag ECU Assembly

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

    2. Connect the connectors to the airbag ECU assembly.

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

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

    5. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1660/43 is not output
      DTC B1660/43 is output

      Tech Tips

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


    DTC B1660/43 is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1660/43 is output

    REPLACE AIRBAG ECU ASSEMBLY Click here