AIRBAG SYSTEM, Diagnostic DTC:B1656/38

DTC Code DTC Name
B1656/38 Seat Belt Buckle Switch LH Circuit Malfunction

DESCRIPTION

The seat belt buckle switch LH circuit consists of the center airbag sensor assembly and front seat inner belt assembly LH.

DTC B1656/38 is stored when a malfunction is detected in the seat belt buckle switch LH circuit.

DTC No. DTC Detection Condition Trouble Area
B1656/38

  • The center airbag sensor 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 seat belt buckle switch LH circuit.

  • Front seat inner belt assembly LH malfunction

  • Center airbag sensor assembly malfunction

  • No. 2 floor wire

  • Front seat inner belt assembly LH (Seat belt buckle switch LH)

  • Center airbag sensor assembly

WIRING DIAGRAM

A017ELRE24

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition 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 center airbag sensor assembly and front seat inner belt assembly LH.

      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 center airbag sensor assembly and front seat inner belt assembly LH.

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

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  2. CHECK NO. 2 FLOOR WIRE (OPEN)


    1. Using SST, connect terminals 11 (LBE+) and 12 (LBE-) of connector B.

      A017FJ3E16

      Note

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

      SST
      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - O10-3 (LBE-) Always Below 1 Ω

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  3. CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A017FQDE13

      Disconnect SST from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - O10-3 (LBE-) Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  4. CHECK NO. 2 FLOOR WIRE (SHORT TO B+)


    1. A017FQDE13

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

    2. Turn the ignition switch on (IG).

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      O10-1 (LBE+) - Body ground Ignition switch on (IG) Below 1 V
      O10-3 (LBE-) - Body ground Ignition switch on (IG) Below 1 V

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  5. CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A017FQDE13

      Turn the ignition switch off.

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O10-1 (LBE+) - Body ground Always 1 MΩ or higher
      O10-3 (LBE-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE NO. 2 FLOOR WIRE

    OK

  6. CHECK FRONT SEAT INNER BELT ASSEMBLY LH


    1. A017BCKE07

      Connect the connectors to the center airbag sensor assembly and front seat inner belt assembly LH.

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

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

    4. Clear the DTCs stored in the memory Click here.

    5. Turn the ignition switch off.

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

    7. Check for DTCs Click here.

      OK
      DTC B1656/38 is not output.

      Tech Tips

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.


    NG

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  7. REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


    1. Turn the ignition switch off.

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

    3. Replace the front seat inner belt assembly LH with a known good part Click here.

      Tech Tips

      Perform the following inspection using known good parts from another vehicle if possible.


    NEXT

  8. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A017BCKE07

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

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

    3. Clear the DTCs stored in the memory Click here.

    4. Turn the ignition switch off.

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

    6. Check for DTCs Click here.

      OK
      DTC B1656/38 is not output.

      Tech Tips

      Codes other than DTC B1656/38 may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    END