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


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK FOR DTC

CHECK CENTER AIRBAG SENSOR ASSEMBLY

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 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:
  1. 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).
  2. A front airbag sensor RH malfunction.
  3. A front airbag sensor LH malfunction.
  4. A center airbag sensor assembly malfunction.
  1. Instrument panel wire
  2. Engine room main wire
  3. Front airbag sensor RH
  4. Front airbag sensor LH
  5. Center airbag sensor assembly

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Supplemental Restraint Systems.Airbag System. Dtc B161A/8A Lost Communication With Front Satellite Sensor Bus


INSPECTION PROCEDURE

NOTICE:
  1. After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
  2. When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).
1.CHECK FOR 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 (LandCruiser RM000000XFE0NGX.html).

    Result
    Result
    		Proceed to
    DTC B1613 is output.
    		A
    DTC B1618 is output.
    		B
    DTCs B1613 and B1618 are not 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.


A
GO TO DTC B1613/83 (LandCruiser RM00000387603SX.html)

B
GO TO DTC B1618/84 (LandCruiser RM0000038AX03ZX.html)
C


2.CHECK CENTER AIRBAG SENSOR ASSEMBLY

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

  1. Clear the DTCs stored in memory (LandCruiser RM000000XFE0NGX.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 (LandCruiser RM000000XFE0NGX.html).

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


NG
REPLACE CENTER AIRBAG SENSOR ASSEMBLY (LandCruiser RM000003YQB01BX.html)
OK

USE SIMULATION METHOD TO CHECK (LandCruiser RM000000XFD0N3X.html)