B161A

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B161A; Lost Communication with Front Satellite Sensor Bus; 2013 MY FR-S [03/2012 -]
B161A - 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 ECU assembly, front airbag sensor RH and front airbag sensor LH.

The front airbag sensor RH and front airbag sensor LH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

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





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

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

(b) 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.

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

(d) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
* 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 and B1618 may be output at this time, but they are not related to this check.

B -- GO TO DTC B1613 B1612

C -- GO TO DTC B1618 B1615
A -- Continue to next step.

2. CHECK DTC

(a) Clear the DTCs stored in memory Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

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

(d) Check for DTCs Reading and Clearing Diagnostic Trouble Codes.

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 AIRBAG ECU ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK