AIRBAG SYSTEM, Diagnostic DTC:B161A/8A

DTC Code DTC Name
B161A/8A Lost Communication with Front Satellite Sensor Bus

DESCRIPTION

The front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit) is composed of the center airbag sensor assembly, front airbag sensor RH and front airbag sensor LH.

The front airbag sensor RH or front 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.

DTC B161A/8A is stored when a malfunction is detected in the front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).

DTC No. DTC Detection Condition Trouble Area
B161A/8A

  • 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 front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).

  • Front airbag sensor RH malfunction

  • Front airbag sensor LH malfunction

  • Center airbag sensor assembly malfunction

  • Instrument panel wire

  • Engine room main wire

  • Front airbag sensor RH

  • Front airbag sensor LH

  • Center airbag sensor assembly

WIRING DIAGRAM

A01EM1UE09

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK DTC


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

    2. Turn the ignition switch off.

      Tech Tips

      If a communication error occurs, DTCs for both LH and RH sides will be stored simultaneously. To identify the malfunctioning area, turn the ignition switch off and then to ON again.

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

    4. Check for DTCs Click here.

      Result
      Result Proceed to
      DTCs B1613/83 and B1618/84 are not output. A
      DTC B1613/83 is output. B
      DTC B1618/84 is output. C

      Tech Tips


      • DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the ignition switch off and then to ON again.

      • Codes other than DTCs B1613/83 and B1618/84 may be output at this time, but they are not related to this check.


    B

    GO TO DTC B1613/83 Click here

    C

    GO TO DTC B1618/84 Click here

    A

  2. CHECK CENTER AIRBAG SENSOR ASSEMBLY


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

    2. Clear the DTCs stored in memory Click here.

    3. Turn the ignition switch off.

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

    5. Check for DTCs Click here.

      OK
      DTC B161A/8A is not output.

      Tech Tips

      Codes other than DTC B161A/8A may be output at this time, but they are not related to this check.


    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    OK

    USE SIMULATION METHOD TO CHECK Click here