AIRBAG SYSTEM, Diagnostic DTC:B1635/24

DTC Code DTC Name
B1635/24 Rear Airbag Sensor LH Circuit Malfunction

DESCRIPTION

The rear airbag sensor LH consists of a safing sensor, diagnostic circuit, lateral deceleration sensor, etc.

If the center airbag sensor receives signals from the lateral deceleration sensor, it determines whether the SRS should be activated.

DTC B1635/24 is stored when a malfunction is detected in the rear airbag sensor LH circuit.

DTC Code Detection Condition Trouble Area
B1635/24

One of the following conditions is met:


  • A rear airbag sensor LH malfunction.

  • A center airbag sensor malfunction.

  • Rear airbag sensor LH

  • Floor wire

  • Center airbag sensor assembly

WIRING DIAGRAM

A004TO4E02
*a Side Airbag Sensor LH
*b Rear Airbag Sensor LH
*c Center Airbag Sensor

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Click here.

PROCEDURE


  1. CHECK CONNECTION OF CONNECTOR


    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 connector is properly connected to the rear airbag sensor LH.

      OK
      The connector is properly connected.

    NG

    CONNECT CONNECTOR PROPERLY

    OK

  2. CHECK CONNECTOR


    1. Disconnect the connectors from the side airbag sensor LH and rear airbag sensor LH.

    2. Check that the connector (on the rear airbag sensor LH side) is not damaged.

      OK
      The connector is not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (REAR AIRBAG SENSOR LH CIRCUIT)

    A004QG7E02
    Text in Illustration
    *1 Rear Airbag Sensor LH
    *2 Floor Wire
    *3 Side Airbag Sensor LH
    *4 Connector C
    *5 Connector B
    *6 Service Wire
    *a

    Rear view of wire harness connector

    (to Rear Airbag Sensor LH)
    *b

    Rear view of wire harness connector

    (to Side Airbag Sensor LH)

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G10-2 (BCL+) - Body ground Ignition switch ON Below 1 V
      G10-1 (BCL-) - Body ground

    3. Turn the ignition switch off.

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

    5. Using a service wire, connect terminals 1 (BCL+) and 2 (BCL-) of connector B.

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G10-2 (BCL+) - G10-1 (BCL-) Always Below 1 Ω

    7. Disconnect the service wire from connector B.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G10-2 (BCL+) - G10-1 (BCL-) Always 1 MΩ or higher
      G10-2 (BCL+) - Body ground
      G10-1 (BCL-) - Body ground

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK REAR AIRBAG SENSOR LH

    A004P2TE01
    Text in Illustration
    *1 Rear Airbag Sensor RH
    *2 Side Airbag Sensor LH

    1. Connect the connector to the center airbag sensor.

    2. Interchange the side airbag sensor RH with LH and connect the connectors to them.

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

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

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

    6. Turn the ignition switch off.

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

    8. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1630 and B1635 are not output A
      DTC B1630 is output (for Sedan) B
      DTC B1630 is output (for Wagon) C
      DTC B1635 is output D

      Tech Tips

      Codes other than DTC B1630 and B1635 may be output at this time, but they are not related to this check.

    9. Turn the ignition switch off.

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

    11. Return the rear airbag sensor RH and LH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    REPLACE REAR AIRBAG SENSOR LH Click here

    D

  5. CHECK SIDE AIRBAG SENSOR LH

    A004NTDE13
    Text in Illustration
    *1 Side Airbag Sensor RH
    *2 Center Airbag Sensor

    1. Interchange the side airbag sensor RH with LH and connect the connectors to them.

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

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

    7. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1630 and B1635 are not output A
      DTC B1630 is output B
      DTC B1635 is output C

      Tech Tips

      Codes other than DTC B1630 and B1635 may be output at this time, but they are not related to this check.

    8. Turn the ignition switch off.

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

    10. Return the side airbag sensor RH and LH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE SIDE AIRBAG SENSOR ASSEMBLY LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here