Dtc B161A/8A Lost Communication With Front Satellite Sensor Bus

Vehicle Interior. Yaris. Ncp93, 131
Supplemental Restraint Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DTC

CHECK DTC

DTC 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 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 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
  1. 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 front collision sensor circuit (front airbag sensor RH circuit and front airbag sensor LH circuit).
  2. Front airbag sensor RH malfunction
  3. Front airbag sensor LH malfunction
  4. Airbag sensor assembly malfunction
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor RH
  4. Front airbag sensor LH
  5. Airbag sensor assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B161A/8A Lost Communication With Front Satellite Sensor Bus


Yaris. Ncp93, 131.Supplemental Restraint Systems.Airbag System (For Sedan). Dtc B161A/8A Lost Communication With Front Satellite Sensor Bus


INSPECTION PROCEDURE

1.CHECK DTC

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

  1. Turn the ignition switch off.

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

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

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0F4X.html).

    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
    HINT:
    1. DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the ignition switch off and then to ON again.
    2. 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 (YARIS_NCP93 RM000000YTM07UX.html)

C
GO TO DTC B1618/84 (YARIS_NCP93 RM000000YTN07VX.html)
A


2.CHECK DTC

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

  1. Clear the DTCs stored in memory (YARIS_NCP93 RM000000XFE0F4X.html).

  1. Turn the ignition switch off.

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

  1. Check for DTCs (YARIS_NCP93 RM000000XFE0F4X.html).

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


NG
REPLACE AIRBAG SENSOR ASSEMBLY (YARIS_NCP93 RM000000V6U02AX.html)
OK

USE SIMULATION METHOD TO CHECK (YARIS_NCP93 RM00000135202EX.html)