B161A

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: 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 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).





WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. CHECK DTC

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

(b) Turn the power 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 power switch off and then on (IG) again.

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

B -- GO TO DTC B1613/83 B1612

C -- GO TO DTC B1618/84 B1617
A -- Continue to next step.

2. CHECK AIRBAG SENSOR ASSEMBLY

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

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

(c) Turn the power switch off.

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

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

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 Removal

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