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 detects impacts to the vehicle and sends 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 Code DTC Detection Condition Trouble Area
B161A/8A

One of the following conditions is met:


  • The center airbag sensor assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).

  • A front airbag sensor RH malfunction.

  • A front airbag sensor LH malfunction.

  • A 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

A000RFFE04
*a Front Airbag Sensor RH
*b Front Airbag Sensor LH
*c Center Airbag Sensor Assembly

CAUTION / NOTICE / HINT

Note


  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work Click here.

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

PROCEDURE


  1. CHECK FOR DTC


    1. Turn the power switch on (IG), and wait for at least 60 seconds.

    2. Turn the power switch off.

      Tech Tips

      If a communication error occurs, DTCs for both the LH and RH sides will be stored simultaneously. To identify the malfunctioning area, turn the power switch off and then on (IG) again.

    3. Turn the power switch on (IG), and wait for at least 60 seconds.

    4. Check for DTCs Click here.

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

      Tech Tips


      • DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the power switch off and then to on (IG) again.

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


    A

    GO TO DTC B1613/83 Click here

    B

    GO TO DTC B1618/84 Click here

    C

  2. CHECK CENTER AIRBAG SENSOR ASSEMBLY


    1. Turn the power switch on (IG), and wait for at least 60 seconds.

    2. Clear the DTCs stored in memory Click here.

    3. Turn the power switch off.

    4. Turn the power switch on (IG), 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.


    OK

    USE SIMULATION METHOD TO CHECK Click here

    NG

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here