B161A

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM (except TMC Made): B161A/8A: Lost Communication with Front Satellite Sensor Bus
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).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

(a) Turn the ignition switch on (IG), 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 on (IG) again.

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

(d) Check for DTCs Airbag System (except TMC Made).

Result:





HINT
* DTCs indicating communication errors will be changed to DTCs indicating errors in initialization by turning the ignition switch off and then 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.

C -- GO TO DTC B1618/84 B1617

B -- GO TO DTC B1613/83 B1612
A -- Continue to next step.

2. CHECK CENTER AIRBAG SENSOR ASSEMBLY

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

(b) Clear the DTCs stored in the memory Airbag System (except TMC Made).

(c) Turn the ignition switch off.

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

(e) Check for DTCs Airbag System (except TMC Made).

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 CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting