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 the seat position airbag sensor.

DTC B1653/35 is recorded 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 for 2 seconds.

  • Seat position airbag sensor malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire No. 2 (for LHD)

  • Floor wire (for RHD)

  • Seat position airbag sensor

  • Center airbag sensor assembly

WIRING DIAGRAM

A017C65E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition switch off.

    2. Disconnect the negative (-) terminal cable from the battery, 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 (Driver side) and the 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 and the seat position airbag sensor.

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

      OK
      The terminals are not deformed or damaged.
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE NO. 2

    C

    REPLACE FLOOR WIRE

    A

  2. CHECK WIRE HARNESS (OPEN)

    A017DDYE01

    1. for LHD:

      Connect the connectors to the front seat inner belt assembly (Driver side) and floor wire No. 2.

    2. for RHD:

      Connect the connectors to the front seat inner belt assembly (Driver side) and floor wire.

    3. Using SST, connect terminals 13 (DSP+) and 14 (DSP-) of connector B.

      Note

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

      SST
      09843-18040

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Always Below 1 Ω

    NG

    CHECK WIRE HARNESS (OPEN) Click here

    OK

  3. CHECK WIRE HARNESS (SHORT)


    1. A017DT9E01

      Disconnect SST from connector B.

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      1 - 2 Always 1 MΩ or higher

    NG

    CHECK WIRE HARNESS (SHORT) Click here

    OK

  4. CHECK WIRE HARNESS (SHORT TO B+)


    1. A017DT9E01

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

    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
      1 - Body ground Ignition switch on (IG) Below 1 V
      2 - Body ground Ignition switch on (IG) Below 1 V

    NG

    CHECK WIRE HARNESS (SHORT TO B+) Click here

    OK

  5. CHECK WIRE HARNESS (SHORT TO GROUND)


    1. A017DT9E01

      Turn the ignition switch off.

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

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      1 - Body ground Always 1 MΩ or higher
      2 - Body ground Always 1 MΩ or higher

    NG

    CHECK WIRE HARNESS (SHORT TO GROUND) Click here

    OK

  6. CHECK SEAT POSITION AIRBAG SENSOR


    1. A017B54E02

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

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

    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 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

  7. REPLACE SEAT POSITION AIRBAG SENSOR


    1. Turn the ignition switch off.

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

    3. Replace the seat position airbag sensor Click here.

      Tech Tips

      Perform inspection using parts from a normal vehicle if possible.


    NEXT

  8. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. A017B54E02

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

    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 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 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 WIRE HARNESS (OPEN)

    A017EJOE02

    1. for LHD:

      Disconnect the floor wire No. 2 connector from the front seat inner belt assembly (Driver side).

      Tech Tips

      SST has already been inserted into connector B.

    2. for RHD:

      Disconnect the floor wire connector from the front seat inner belt assembly (Driver side).

      Tech Tips

      SST has already been inserted into connector B.

    3. Using SST, connect terminals 14 (DSP+) and 13 (DSP-) of connector B.

      Note

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

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

      Standard resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      O10-2 (LSP+) - O10-4 (LSP-) Always Below 1 Ω
      for RHD
      Tester Connection Switch Condition Specified Condition
      N19-2 (RSP+) - N19-4 (RSP-) Always Below 1 Ω
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE NO. 2

    C

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)

  10. CHECK WIRE HARNESS (SHORT)


    1. A017CKCE02

      for LHD:

      Disconnect the floor wire No. 2 connector from the front seat inner belt assembly (Driver side).

    2. for RHD:

      Disconnect the floor wire connector from the front seat inner belt assembly (Driver side).

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

      Standard resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      O10-2 (LSP+) - O10-4 (LSP-) Always 1 MΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      N19-2 (RSP+) - N19-4 (RSP-) Always 1 MΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE NO. 2

    C

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)

  11. CHECK WIRE HARNESS (SHORT TO B+)


    1. A017CKCE02

      Turn the ignition switch off.

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

    3. for LHD:

      Disconnect the floor wire No. 2 connector from the front seat inner belt assembly (Driver side).

    4. for RHD:

      Disconnect the floor wire connector from the front seat inner belt assembly (Driver side).

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

    6. Turn the ignition switch on (IG).

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

      Standard voltage
      for LHD
      Tester Connection Switch Condition Specified Condition
      O10-2 (LSP+) - Body ground Ignition switch on (IG) Below 1 V
      O10-4 (LSP-) - Body ground Ignition switch on (IG) Below 1 V
      for RHD
      Tester Connection Switch Condition Specified Condition
      N19-2 (RSP+) - Body ground Ignition switch on (IG) Below 1 V
      N19-4 (RSP-) - Body ground Ignition switch on (IG) Below 1 V
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE NO. 2

    C

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)

  12. CHECK WIRE HARNESS (SHORT TO GROUND)


    1. A017CKCE02

      for LHD:

      Disconnect the floor wire No. 2 connector from the front seat inner belt assembly (Driver side).

    2. for RHD:

      Disconnect the floor wire connector from the front seat inner belt assembly (Driver side).

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

      Standard resistance
      for LHD
      Tester Connection Switch Condition Specified Condition
      O10-2 (LSP+) - Body ground Always 1 MΩ or higher
      O10-4 (LSP-) - Body ground Always 1 MΩ or higher
      for RHD
      Tester Connection Switch Condition Specified Condition
      N19-2 (RSP+) - Body ground Always 1 MΩ or higher
      N19-4 (RSP-) - Body ground Always 1 MΩ or higher
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    REPLACE FLOOR WIRE NO. 2

    C

    REPLACE FLOOR WIRE

    A

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)