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AIRBAG SYSTEM, Diagnostic DTC:B1656/38

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

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INSPECTION PROCEDURE

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PROCEDURE


  1. Click here

    CHECK CONNECTORS


    1. Turn the engine switch off.

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

      Note:

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

    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.
      Tip:

      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 connectors are not damaged.

      OK
      The terminals are not deformed or damaged.

  2. Click here

    CHECK NO. 2 FLOOR WIRE (OPEN)


    1. A019MUDE02

      Using SST, connect terminals 10 (LBE+) and 18 (LBE-) of connector B.

      Note:

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

      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P7-1 (LBE+) - P7-3 (LBE-) Always Below 1 Ω
      Table 1. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH) *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire *4

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)
      *5

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)

      		 *6 Connector B
      *7 Connector C - -

  3. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT)


    1. A019KWOE02

      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
      P7-1 (LBE+) - P7-3 (LBE-) Always 1 MΩ or higher
      Table 2. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH)
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *5 Connector C

  4. Click here

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


    1. A019KWOE02

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

    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
      P7-1 (LBE+) - Body ground Engine switch on (IG) Below 1 V
      P7-3 (LBE-) - Body ground Engine switch on (IG) Below 1 V
      Table 3. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH)
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *5 Connector C

  5. Click here

    CHECK NO. 2 FLOOR WIRE (SHORT TO GROUND)


    1. A019KWOE02

      Turn the engine switch off.

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

      Note:

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      P7-1 (LBE+) - Body ground Always 1 MΩ or higher
      P7-3 (LBE-) - Body ground Always 1 MΩ or higher
      Table 4. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH)
      *2 Center Airbag Sensor Assembly
      *3 No. 2 Floor Wire
      *4

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *5 Connector C

  6. Click here

    CHECK FRONT SEAT INNER BELT ASSEMBLY LH


    1. A019L4PE01

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

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

    5. Turn the engine switch off.

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

    7. Check for DTCs (Click here).

      OK
      DTC B1656/38 is not output.
      Table 5. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH)
      *2 Center Airbag Sensor Assembly
      Tip:

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


  7. Click here

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH


    1. Turn the engine switch off.

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

      Note:

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

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

      Tip:

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


  8. Click here

    CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A019L4PE01

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

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

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

    4. Turn the engine switch off.

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

    6. Check for DTCs (Click here).

      OK
      DTC B1656/38 is not output.
      Table 6. Text in Illustration
      *1 Front Seat Inner Belt Assembly LH (Seat Belt Buckle Switch LH)
      *2 Center Airbag Sensor Assembly
      Tip:

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


  9. Click here

    REPLACE NO. 2 FLOOR WIRE

  10. Click here

    USE SIMULATION METHOD TO CHECKClick here

  11. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

  12. Click here

    END