AIRBAG SYSTEM, Diagnostic DTC:B1653/35

DTC Code DTC Name
B1653/35 Seat Position Airbag Sensor Circuit Malfunction

DESCRIPTION

The seat position airbag sensor circuit consists of the center airbag sensor assembly and seat position airbag sensor.

DTC B1653/35 is stored when a malfunction is detected in the seat position airbag sensor circuit.

DTC No. DTC Detection Condition Trouble Area
B1653/35

  • 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 position airbag sensor circuit.

  • Front seat inner belt assembly LH malfunction

  • Seat position airbag sensor malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Front seat inner belt assembly LH

  • Seat position airbag sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A01EL6NE17

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, front seat inner belt assembly LH and seat position airbag sensor.

      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, front seat inner belt assembly LH and seat position airbag sensor.

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

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE WIRE HARNESS

    OK

  2. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (OPEN)


    1. Connect the connectors to the front seat inner belt assembly LH and floor wire.

      A01EJB9E05

    2. Using SST, connect terminals 9 (LSP+) and 17 (LSP-) of connector B.

      Note

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

      SST
      09843-18040

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (LSP+) - 1 (LSP-) Always Below 1 Ω
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *4

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *5 Connector B *6 Connector E

    NG

    CHECK FLOOR WIRE (OPEN) Click here

    OK

  3. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT)


    1. A01EMBBE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

      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
      2 (LSP+) - 1 (LSP-) Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (SHORT) Click here

    OK

  4. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO B+)


    1. A01EMBBE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

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

    2. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      2 (LSP+) - Body ground Ignition switch ON Below 1 V
      1 (LSP-) - Body ground Ignition switch ON Below 1 V

    NG

    CHECK FLOOR WIRE (SHORT TO B+) Click here

    OK

  5. CHECK SEAT POSITION AIRBAG SENSOR CIRCUIT (SHORT TO GROUND)


    1. A01EMBBE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3

      Front view of wire harness connector

      (to Seat Position Airbag Sensor)
      *4 Connector E

      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
      2 (LSP+) - Body ground Always 1 MΩ or higher
      1 (LSP-) - Body ground Always 1 MΩ or higher

    NG

    CHECK FLOOR WIRE (SHORT TO GROUND) Click here

    OK

  6. CHECK SEAT POSITION AIRBAG SENSOR


    1. A01EJZKE01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

      Connect the connectors to the center airbag sensor assembly and seat position airbag sensor.

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

    3. Turn the ignition switch to ON, and wait for at least 60 seconds.

    4. Clear the DTCs stored in memory Click here.

    5. Turn the ignition switch off.

    6. Turn the ignition switch to ON, and wait for at least 60 seconds.

    7. Check for DTCs Click here.

      OK
      DTC B1653/35 is not output.

      Tech Tips

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


    NG

    REPLACE SEAT POSITION AIRBAG SENSOR Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here

  7. REPLACE SEAT POSITION AIRBAG SENSOR


    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 seat position airbag sensor 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. A01EJZKE01
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly

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

    2. Turn the ignition switch to ON, and wait for at least 60 seconds.

    3. Clear the DTCs stored in memory Click here.

    4. Turn the ignition switch off.

    5. Turn the ignition switch to ON, and wait for at least 60 seconds.

    6. Check for DTCs Click here.

      OK
      DTC B1653/35 is not output.

      Tech Tips

      Codes other than DTC B1653/35 may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    END

  9. CHECK FLOOR WIRE (OPEN)


    1. Disconnect the floor wire from the front seat inner belt assembly LH.

      Tech Tips

      SST has already been inserted into connector B.

      A01EKYPE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L19-2 (LSP+) - L19-4 (LSP-) Always Below 1 Ω
      Text in Illustration
      *1 Seat Position Airbag Sensor *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH *4 Floor Wire
      *5

      Front view of wire harness connector

      (to Center Airbag Sensor Assembly)

      		 *6

      Front view of wire harness connector

      (to Front Seat Inner Belt Assembly LH)
      *7 Connector B *8 Connector C

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

  10. CHECK FLOOR WIRE (SHORT)


    1. A01EKNNE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *5

      Front view of wire harness connector

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

      Disconnect the floor wire from the front seat inner belt assembly LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L19-2 (LSP+) - L19-4 (LSP-) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

  11. CHECK FLOOR WIRE (SHORT TO B+)


    1. A01EKNNE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *5

      Front view of wire harness connector

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

      Turn the ignition switch off.

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

    3. Disconnect the floor wire from the front seat inner belt assembly LH.

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

    5. Turn the ignition switch to ON.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      L19-2 (LSP+) - Body ground Ignition switch ON Below 1 V
      L19-4 (LSP-) - Body ground Ignition switch ON Below 1 V

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here

  12. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A01EKNNE03
      Text in Illustration
      *1 Seat Position Airbag Sensor
      *2 Center Airbag Sensor Assembly
      *3 Front Seat Inner Belt Assembly LH
      *4 Floor Wire
      *5

      Front view of wire harness connector

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

      Disconnect the floor wire from the front seat inner belt assembly LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L19-2 (LSP+) - Body ground Always 1 MΩ or higher
      L19-4 (LSP-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

    REPLACE FRONT SEAT INNER BELT ASSEMBLY LH Click here