AIRBAG SYSTEM, Diagnostic DTC:B1637/82, B1638/82

DTC Code DTC Name
B1637/82 Lost Communication with Rear Airbag Sensor LH
B1638/82 Rear Airbag Sensor Assembly LH Initialization Incomplete

DESCRIPTION

The side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH) is composed of the center airbag sensor assembly, side airbag sensor LH and rear airbag sensor LH.

The side airbag sensor LH and rear airbag sensor LH detect impacts to the vehicle and send signals to the center airbag sensor assembly to determine if the airbag should be deployed.

These DTCs are stored when a malfunction is detected in the side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

DTC No. DTC Detection Condition Trouble Area

B1637/82

B1638/82

  • 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 side collision sensor LH circuit (to determine deployment of the front seat side airbag assembly LH and curtain shield airbag assembly LH).

  • Side airbag sensor LH malfunction

  • Rear airbag sensor LH malfunction

  • Center airbag sensor assembly malfunction

  • Floor wire

  • Side airbag sensor LH

  • Rear airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A005KU0E04
*a Side Airbag Sensor LH
*b Rear Airbag Sensor LH
*c Center Airbag Sensor Assembly

PROCEDURE


  1. CHECK CONNECTORS


    1. Turn the ignition switch off.

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

      CAUTION:

      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, side airbag sensor LH and rear airbag sensor 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, side airbag sensor LH and rear airbag sensor LH.

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

      OK
      The terminals are not deformed or damaged.

    NG

    REPLACE FLOOR WIRE

    OK

  2. CHECK FLOOR WIRE (OPEN)


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

      A005IADE02

      Note

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-1 (BCL+) - K21-2 (BCL-) Always Below 1 Ω
      Text in Illustration
      *1 Rear Airbag Sensor LH *2 Side Airbag Sensor LH
      *3 Floor Wire *4 Connector B
      *5 Connector C *6 Service Wire
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor LH)

      		 *b

      Front view of wire harness connector

      (to Rear Airbag Sensor LH)

    NG

    REPLACE FLOOR WIRE

    OK

  3. CHECK FLOOR WIRE (SHORT)


    1. A005IN6E02
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor LH
      *3 Floor Wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor LH)

      Disconnect the service wire from connector C.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K21-1 (BCL+) - K21-2 (BCL-) Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  4. CHECK FLOOR WIRE (SHORT TO B+)


    1. A005IN6E02
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor LH
      *3 Floor Wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor LH)

      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
      K21-1 (BCL+) - Body ground Ignition switch ON Below 1 V
      K21-2 (BCL-) - Body ground Ignition switch ON Below 1 V

    NG

    REPLACE FLOOR WIRE

    OK

  5. CHECK FLOOR WIRE (SHORT TO GROUND)


    1. A005IN6E02
      Text in Illustration
      *1 Rear Airbag Sensor LH
      *2 Side Airbag Sensor LH
      *3 Floor Wire
      *4 Connector B
      *a

      Front view of wire harness connector

      (to Side Airbag Sensor LH)

      Turn the ignition switch off.

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

      CAUTION:

      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
      K21-1 (BCL+) - Body ground Always 1 MΩ or higher
      K21-2 (BCL-) - Body ground Always 1 MΩ or higher

    NG

    REPLACE FLOOR WIRE

    OK

  6. CHECK SIDE AIRBAG SENSOR LH


    1. Connect the connectors to the rear airbag sensor LH and center airbag sensor assembly.

    2. A005J5UE02
      Text in Illustration
      *1 Side Airbag Sensor RH
      *2 Center Airbag Sensor Assembly

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

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

    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 B1637/82 or B1638/82 is output. A
      DTC B1632/81 or B1633/81 is output. B
      DTCs B1632/81, B1633/81, B1637/82 or B1638/82 is not output. C

      Tech Tips

      Codes other than DTCs B1632/81, B1633/81, B1637/82 and B1638/82 may be output at this time, but they are not related to this check.


    B

    REPLACE SIDE AIRBAG SENSOR LH Click here

    C

    USE SIMULATION METHOD TO CHECK Click here

    A

  7. CHECK REAR AIRBAG SENSOR LH


    1. Turn the ignition switch off.

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

      CAUTION:

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

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

    4. A005L1SE19
      Text in Illustration
      *1 Rear Airbag Sensor RH
      *2 Side Airbag Sensor LH

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

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

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

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

    8. Turn the ignition switch off.

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

    10. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs B1632/81, B1633/81, B1637/82 or B1638/82 is not output. A
      DTC B1632/81 or B1633/81 is output. B
      DTC B1637/82 or B1638/82 is output. C

      Tech Tips

      Codes other than DTCs B1632/81, B1633/81, B1637/82 and B1638/82 may be output at this time, but they are not related to this check.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE REAR AIRBAG SENSOR LH Click here

    C

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here