AIRBAG SYSTEM, Diagnostic DTC:B165C

DTC Code DTC Name
B165C 2nd Seat Seat Belt Buckle Switch (LH)

DESCRIPTION

The seat belt buckle switch LH circuit consists of the airbag ECU assembly, pedestrian detection ECU assembly and rear seat inner belt assembly LH.

DTC B165C is stored when a malfunction is detected in the seat belt buckle switch LH circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B165C 2nd Seat Seat Belt Buckle Switch (LH)

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 seat belt buckle switch LH circuit.

  • A rear seat inner belt assembly LH malfunction

  • An airbag ECU assembly malfunction

  • Floor wire

  • Rear seat wire RH

  • Instrument panel wire

  • Rear seat inner belt assembly LH

  • Airbag ECU assembly

 Comes on Not applicable

WIRING DIAGRAM

B004XUUE10
*a Rear Seat Inner Belt Assembly LH
*b Pedestrian Detection ECU Assembly
*c Airbag ECU Assembly
*d CAN Communication Line

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 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 pedestrian detection ECU assembly and rear seat inner belt assembly LH.

      Result
      Proceed to
      Connectors are properly connected
      Connectors are not properly connected

    Connectors are not properly connected

    CONNECT CONNECTORS PROPERLY

    Connectors are properly connected

  2. CHECK CONNECTORS


    1. B004UGVC05
      *1 Rear Seat Inner Belt Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire
      *5 Instrument Panel Wire

      Disconnect the connectors from the pedestrian detection ECU assembly and rear seat inner belt assembly LH.

    2. Check that the connectors (on the pedestrian detection ECU assembly side and rear seat inner belt assembly LH side) are not damaged.

      Result
      Proceed to
      Connectors are not deformed or damaged
      Connectors are deformed or damaged

    Connectors are deformed or damaged

    REPLACE REAR SEAT WIRE LH OR INSTRUMENT PANEL WIRE

    Connectors are not deformed or damaged

  3. CHECK REAR SEAT INNER BELT ASSEMBLY LH CIRCUIT


    1. B004VHZC01
      *1 Rear Seat Inner Belt Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Seat Inner Belt Assembly LH)
      *b

      Front view of wire harness connector

      (to Pedestrian Detection 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
      R50-1 - Body ground Power switch on (IG) Below 1 V
      R50-2 - 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 14 (LBR-) and 15 (LBR+) 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
      R50-1 - R50-2 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
      R50-1 - R50-2 Always 1 MΩ or higher
      R50-1 - Body ground Always 1 MΩ or higher
      R50-2 - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    CHECK REAR SEAT INNER BELT ASSEMBLY LH CIRCUIT Click here

    OK

  4. CHECK DTC


    1. B004T59C04
      *1 Rear Seat Inner Belt Assembly LH
      *2 Pedestrian Detection ECU Assembly

      Connect the connectors to the pedestrian detection ECU assembly and rear seat inner belt assembly LH.

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

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

    4. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    5. Turn the power switch off.

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

    7. Check for DTCs.

      Click here


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B165C is not output
      DTC B165C is output

      Tech Tips

      Codes other than DTC B165C may be output at this time, but they are not related to this check.


    DTC B165C is not output

    USE SIMULATION METHOD TO CHECK Click here

    DTC B165C is output

  5. CHECK REAR SEAT INNER BELT ASSEMBLY LH


    1. Turn the power switch off.

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

    3. Replace the rear seat inner belt assembly LH.

      for Fixed Seat Type:

      Click here

      for Power Seat:

      Click here

      Tech Tips

      Perform the inspection using parts from a normal vehicle if possible.

      Result
      Proceed to
      NEXT

    NEXT

  6. CHECK DTC


    1. B004T59C06
      *1 Rear Seat Airbag Assembly LH
      *2 Pedestrian Detection 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), and wait for at least 60 seconds.

    3. Clear the DTCs.

      Click here


      Body Electrical > SRS Airbag > Clear DTCs

    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


      Body Electrical > SRS Airbag > Trouble Codes
      Result
      Proceed to
      DTC B165C is not output
      DTC B165C is output

      Tech Tips

      Codes other than DTC B165C may be output at this time, but they are not related to this check.


    DTC B165C is not output

    END (REAR SEAT INNER BELT ASSEMBLY LH WAS DEFECTIVE)

    DTC B165C is output

    REPLACE AIRBAG ECU ASSEMBLY Click here

  7. CHECK REAR SEAT INNER BELT ASSEMBLY LH CIRCUIT


    1. B004WTXC02
      *1 Rear Seat Inner Belt Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Seat Wire LH)
      *b

      Front view of wire harness connector

      (to Pedestrian Detection 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
      LR 6-1 (LBR+) - Body ground Power switch on (IG) Below 1 V
      LR 6-2 (LBR-) - 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 14 (LBR-) and 15 (LBR+) 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
      LR 6-1 (LBR+) - LR 6-2 (LBR-) 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
      LR 6-1 (LBR+) - LR 6-2 (LBR-) Always 1 MΩ or higher
      LR 6-1 (LBR+) - Body ground Always 1 MΩ or higher
      LR 6-2 (LBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPLACE REAR SEAT WIRE LH

    OK

  8. CHECK INSTRUMENT PANEL WIRE


    1. B004TUZC02
      *1 Rear Seat Inner Belt Assembly LH
      *2 Pedestrian Detection ECU Assembly
      *3 Rear Seat Wire LH
      *4 Floor Wire
      *5 Instrument Panel Wire
      *6 Service Wire
      *a

      Front view of wire harness connector

      (to Rear Seat Wire LH)
      *b

      Front view of wire harness connector

      (to Pedestrian Detection 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
      GL 1-8 (LBR+) - Body ground Power switch on (IG) Below 1 V
      GL 1-9 (LBR-) - 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 14 (LBR-) and 15 (LBR+) 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
      GL 1-8 (LBR+) - GL 1-9 (LBR-) 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
      GL 1-8 (LBR+) - GL 1-9 (LBR-) Always 1 MΩ or higher
      GL 1-8 (LBR+) - Body ground Always 1 MΩ or higher
      GL 1-9 (LBR-) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FLOOR WIRE

    NG

    REPLACE REAR SEAT WIRE LH