AIRBAG SYSTEM, Diagnostic DTC:B1673/81, B1674/81, B1684/82, B1689/82

DTC Code DTC Name
B1673/81 Lost Communication with Driver Side Door Side Airbag Sensor
B1674/81 Driver Side Door Side Airbag Sensor Initialization Incomplete
B1684/82 Lost Communication with Front Passenger Side Door Side Airbag Sensor
B1689/82 Front Passenger Side Door Side Airbag Sensor Initialization Incomplete

DESCRIPTION

The circuit for the side collision sensor LH or RH is composed of the airbag ECU assembly, No. 2 side airbag sensor assembly LH or RH and door side airbag sensor LH or RH.

The door side airbag sensor LH or RH and No. 2 side airbag sensor assembly LH or RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

Note


  • DTC B1673/81 is stored when a malfunction is detected in the circuit for the side satellite sensor bus RH.

  • DTC B1674/81 is stored when a malfunction is detected in the circuit for the side satellite sensor bus RH.

  • DTC B1684/82 is stored when a malfunction is detected in the circuit for the side satellite sensor bus LH.

  • DTC B1689/82 is stored when a malfunction is detected in the circuit for the side satellite sensor bus LH.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1673/81 Lost Communication with Driver Side Door Side Airbag Sensor

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side satellite sensor bus RH for 2 seconds.

  • A No. 2 side airbag sensor assembly RH malfunction.

  • An airbag ECU assembly malfunction.

  • No. 2 floor wire

  • Rear door wire RH

  • Rear airbag sensor RH

  • No. 2 side airbag sensor assembly RH

  • Airbag ECU assembly
B1674/81 Driver Side Door Side Airbag Sensor Initialization Incomplete

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side satellite sensor bus RH for 2 seconds.

  • A No. 2 side airbag sensor assembly RH malfunction.

  • An airbag ECU assembly malfunction.

  • No. 2 floor wire

  • Rear door wire RH

  • Rear airbag sensor RH

  • No. 2 side airbag sensor assembly RH

  • Airbag ECU assembly
B1684/82 Lost Communication with Front Passenger Side Door Side Airbag Sensor

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side satellite sensor bus LH for 2 seconds.

  • A No. 2 side airbag sensor assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear door wire LH

  • Rear airbag sensor LH

  • No. 2 side airbag sensor assembly LH

  • Airbag ECU assembly
B1689/82 Front Passenger Side Door Side Airbag Sensor Initialization Incomplete

One of the following conditions is met:


  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side satellite sensor bus LH for 2 seconds.

  • A No. 2 side airbag sensor assembly LH malfunction.

  • An airbag ECU assembly malfunction.

  • Floor wire

  • Rear door wire LH

  • Rear airbag sensor LH

  • No. 2 side airbag sensor assembly LH

  • Airbag ECU assembly

WIRING DIAGRAM

Figure 1. for RH

B006QG2E09
*a Door Side Airbag Sensor RH
*b No. 2 Side Airbag Sensor Assembly RH
*c Rear Airbag Sensor RH
*d Airbag ECU Assembly

Figure 2. for LH

B006QG2E11
*a Door Side Airbag Sensor LH
*b No. 2 Side Airbag Sensor Assembly LH
*c Rear Airbag Sensor LH
*d Airbag ECU Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the engine 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

  • 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

  • After replacing the airbag ECU assembly, refer to initialization.

    Click here

PROCEDURE


  1. CHECK DTC


    1. Turn the engine switch off.

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

    3. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1673/81 or B1674/81 is output
      DTC B1684/82 or B1689/82 is output
      DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

      Tech Tips

      Codes other than DTC B1673/81, B1674/81, B1684/82 and B1689/82 may be output at this time, but they are not related to this check.


    DTC B1684/82 or B1689/82 is output

    CHECK CONNECTION OF CONNECTORS Click here

    DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1673/81 or B1674/81 is output

  2. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine 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 rear airbag sensor RH and No. 2 side airbag sensor assembly RH.

      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. Disconnect the connectors from the rear airbag sensor RH and No. 2 side airbag sensor assembly RH.

    2. B006KMRC06
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor RH
      *3 Rear Door Wire RH
      *4 No. 2 Floor Wire

      Check that the connectors (on the rear airbag sensor RH side and No. 2 side airbag sensor assembly RH 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 NO. 2 FLOOR WIRE OR REAR DOOR WIRE RH

    The connectors are not deformed or damaged

  4. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH CIRCUIT


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

      B006LUMC02
      *1 No. 2 Side Airbag Sensor Assembly RH *2 Rear Airbag Sensor RH
      *3 Rear Door Wire RH *4 No. 2 Floor Wire
      *5 Connector E *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly RH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J9-2 (BDR+) - Body ground Engine switch on (IG) Below 1 V
      J9-1 (BDR-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

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

    6. Using a service wire, connect terminals 1 (BDR+) and 2 (BDR-) 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
      J9-2 (BDR+) - J9-1 (BDR-) 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
      J9-2 (BDR+) - J9-1 (BDR-) Always 1 MΩ or higher
      J9-2 (BDR+) - Body ground Always 1 MΩ or higher
      J9-1 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK NO. 2 FLOOR WIRE Click here

    OK

  5. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH


    1. B006P0FC22
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor RH

      Connect the connectors to the rear airbag sensor RH.

    2. Interchange the No. 2 side airbag sensor assembly RH and LH, and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine switch on (IG), and wait for at least 90 seconds.

    8. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B1673/81 or B1674/81 is output
      DTC B1684/82 or B1689/82 is output
      DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

      Tech Tips

      Codes other than DTC B1673/81, B1674/81, B1684/82 and B1689/82 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the No. 2 side airbag sensor assembly LH and RH to their original positions and connect the connectors to them.


    DTC B1684/82 or B1689/82 is output

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY RH Click here

    DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B1673/81 or B1674/81 is output

  6. CHECK REAR AIRBAG SENSOR RH


    1. B006P0FC37
      *1 Rear Airbag Sensor LH
      *2 Door Side Airbag Sensor RH

      Connect the connectors to the door side airbag sensor RH.

    2. Interchange the rear airbag sensor RH and LH, and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine 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 B1673/81 or B1674/81 is output
      DTC B1684/82 or B1689/82 is output
      DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

      Tech Tips

      Codes other than DTC B1673/81, B1674/81, B1684/82 and B1689/82 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor LH and RH to their original positions and connect the connectors to them.


    DTC B1673/81 or B1674/81 is output

    REPLACE AIRBAG ECU ASSEMBLY w/ Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here
    REPLACE AIRBAG ECU ASSEMBLY w/o Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here

    DTC B1684/82 or B1689/82 is output

    REPLACE REAR AIRBAG SENSOR RH Click here

    DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

  7. CHECK NO. 2 FLOOR WIRE


    1. Disconnect the floor wire connector from the rear door wire RH.

      B006LW1C01
      *1 No. 2 Side Airbag Sensor Assembly RH *2 Rear Airbag Sensor RH
      *3 Rear Door Wire RH *4 NO. 2 Floor Wire
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Rear Door Wire RH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor RH)

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

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      JL3-2 (BDR+) - Body ground Engine switch on (IG) Below 1 V
      JL3-1 (BDR-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

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

    7. Using a service wire, connect terminals 1 (BDR+) and 2 (BDR-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      JL3-2 (BDR+) - JL3-1 (BDR-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      JL3-2 (BDR+) - JL3-1 (BDR-) Always 1 MΩ or higher
      JL3-2 (BDR+) - Body ground Always 1 MΩ or higher
      JL3-1 (BDR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR DOOR WIRE RH

    NG

    REPLACE NO. 2 FLOOR WIRE

  8. CHECK CONNECTION OF CONNECTORS


    1. Turn the engine 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 rear airbag sensor LH and No. 2 side airbag sensor assembly LH.

      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

  9. CHECK CONNECTORS


    1. Disconnect the connectors from the rear airbag sensor LH and No. 2 side airbag sensor assembly LH.

    2. B006KMRC17
      *1 No. 2 Side Airbag Sensor Assembly LH
      *2 Rear Airbag Sensor LH
      *3 Rear Door Wire LH
      *4 Floor Wire

      Check that the connectors (on the rear airbag sensor LH side and No. 2 side airbag sensor assembly LH 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 FLOOR WIRE OR REAR DOOR WIRE LH

    The connectors are not deformed or damaged

  10. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH CIRCUIT


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

      B006LUMC03
      *1 No. 2 Side Airbag Sensor Assembly LH *2 Rear Airbag Sensor LH
      *3 Rear Door Wire LH *4 Floor Wire
      *5 Connector E *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to No. 2 Side Airbag Sensor Assembly LH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

    2. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      J22-2 (BDL+) - Body ground Engine switch on (IG) Below 1 V
      J22-1 (BDL-) - Body ground Engine switch on (IG) Below 1 V

    4. Turn the engine switch off.

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

    6. Using a service wire, connect terminals 1 (BDL+) and 2 (BDL-) 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
      J22-2 (BDL+) - J22-1 (BDL-) 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
      J22-2 (BDL+) - J22-1 (BDL-) Always 1 MΩ or higher
      J22-2 (BDL+) - Body ground Always 1 MΩ or higher
      J22-1 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FLOOR WIRE Click here

    OK

  11. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH


    1. B006P0FC09
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Rear Airbag Sensor LH

      Connect the connectors to the rear airbag sensor LH.

    2. Interchange the No. 2 side airbag sensor assembly LH and RH, and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine 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 B1673/81 or B1674/81 is output
      DTC B1684/82 or B1689/82 is output
      DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

      Tech Tips

      Codes other than DTC B1673/81, B1674/81, B1684/82 and B1689/82 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the No. 2 side airbag sensor assembly RH and LH to their original positions and connect the connectors to them.


    DTC B1673/81 or B1674/81 is output

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    DTC B1684/82 or B1689/82 is output

    CHECK REAR AIRBAG SENSOR LH Click here

    DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

    USE SIMULATION METHOD TO CHECK Click here

  12. CHECK FLOOR WIRE


    1. Disconnect the floor wire connector from the rear door wire LH.

      B006LW1C02
      *1 No. 2 Side Airbag Sensor Assembly LH *2 Rear Airbag Sensor LH
      *3 Rear Door Wire LH *4 Floor Wire
      *5 Connector C *6 Connector B
      *7 Service Wire - -
      *a

      Front view of wire harness connector

      (to Rear Door Wire LH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

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

    3. Turn the engine switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      JK3-2 (BDL+) - Body ground Engine switch on (IG) Below 1 V
      JK3-1 (BDL-) - Body ground Engine switch on (IG) Below 1 V

    5. Turn the engine switch off.

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

    7. Using a service wire, connect terminals 1 (BDL+) and 2 (BDL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      JK3-2 (BDL+) - JK3-1 (BDL-) Always Below 1 Ω

    9. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      JK3-2 (BDL+) - JK3-1 (BDL-) Always 1 MΩ or higher
      JK3-2 (BDL+) - Body ground Always 1 MΩ or higher
      JK3-1 (BDL-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REAR DOOR WIRE LH

    NG

    REPLACE FLOOR WIRE

  13. CHECK REAR AIRBAG SENSOR LH


    1. B006P0FC38
      *1 Rear Airbag Sensor RH
      *2 Door Side Airbag Sensor LH

      Connect the connectors to the door side airbag sensor LH.

    2. Interchange the rear airbag sensor LH and RH, and connect the connectors to them.

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

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

    5. Clear the DTCs stored in memory.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    6. Turn the engine switch off.

    7. Turn the engine 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 B1673/81 or B1674/81 is output
      DTC B1684/82 or B1689/82 is output
      DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

      Tech Tips

      Codes other than DTC B1673/81, B1674/81, B1684/82 and B1689/82 may be output at this time, but they are not related to this check.

    9. Turn the engine switch off.

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

    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.


    DTC B1673/81 or B1674/81 is output

    REPLACE REAR AIRBAG SENSOR LH Click here

    DTC B1684/82 or B1689/82 is output

    REPLACE AIRBAG ECU ASSEMBLY w/ Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here
    REPLACE AIRBAG ECU ASSEMBLY w/o Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here

    DTC B1673/81, B1674/81, B1684/82 and B1689/82 are not output

    USE SIMULATION METHOD TO CHECK Click here