AIRBAG SYSTEM, Diagnostic DTC:B1637/82

DTC Code DTC Name
B1637/82 Lost Communication with Rear Airbag Sensor LH

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 airbag sensor assembly, door side airbag sensor LH and No. 2 side airbag sensor assembly LH.

The door side airbag sensor LH and No. 2 side airbag sensor assembly LH detect impacts to the vehicle and send signals to the airbag sensor assembly to determine if the airbag should be deployed.

This DTC is 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

Any of the following conditions is met:


  • The 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).

  • Door side airbag sensor LH malfunction

  • No. 2 side airbag sensor assembly LH malfunction

  • Airbag sensor assembly malfunction

  • Floor wire

  • Door side airbag sensor LH

  • No. 2 side airbag sensor assembly LH

  • Airbag sensor assembly

WIRING DIAGRAM

A004ENXE29
*a No. 2 Side Airbag Sensor Assembly LH
*b Door Side Airbag Sensor LH
*c Airbag Sensor Assembly

PROCEDURE


  1. CHECK NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH


    1. A004GA8E01
      Text in Illustration
      *1 No. 2 Side Airbag Sensor Assembly RH
      *2 Airbag Sensor Assembly

      Turn the ignition switch off.

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

      CAUTION:

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

    3. Interchange the No. 2 side airbag sensor assembly LH with No. 2 side airbag sensor assembly RH and connect the connectors to them.

    4. Connect the cable to the negative auxiliary battery terminal, and wait for at least 2 seconds.

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

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

    7. Turn the ignition switch off.

    8. Turn the ignition switch to ON (IG), and wait for at least 60 seconds.

    9. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B1632/81 and B1637/82 is not output. A
      DTC B1637/82 is output. B
      DTC B1632/81 is output. C

      Tech Tips

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

    10. Turn the ignition switch off.

    11. Disconnect the cable from the negative (-) auxiliary battery terminal.

      CAUTION:

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

    12. Return the No. 2 side airbag sensor assembly RH and the No. 2 side airbag sensor assembly LH to their original positions and connect the connectors to them.


    A

    USE SIMULATION METHOD TO CHECK Click here

    B

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    C

    REPLACE NO. 2 SIDE AIRBAG SENSOR ASSEMBLY LH Click here