B181D

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B181A/7A-B181D/7A: Short in Passenger Side Airbag Variable Vent Hole Squib Circuit


DESCRIPTION

The variable vent hole squib circuit consists of the center airbag sensor and front passenger airbag.

The circuit instructs the SRS to deploy when the deployment conditions are met.

These DTCs are recorded when a malfunction is detected in the variable vent hole squib circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
- Perform the simulation method by selecting "check mode" (signal check) with the Techstream Check Mode Procedure.
- After selecting "check mode" (signal check), perform the simulation method by wiggling each connector of the airbag system or driving the vehicle on various types of roads Diagnosis System.

PROCEDURE

1. CHECK FRONT PASSENGER AIRBAG (VARIABLE VENT HOLE SQUIB)





(a) Turn the ignition switch OFF.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect the connectors from the front passenger airbag.

(d) Connect the white wire side of SST (resistance: 2.1 Ohms) to connector E (orange connector).

CAUTION:
Never connect the tester to the front passenger airbag (variable vent hole squib) for measurement, as this may lead to a serious injury due to airbag deployment.

NOTICE:
- Do not forcibly insert SST into the terminals of the connector when connecting SST.
- Insert SST straight into the terminals of the connector.

SST : 09843-18061

(e) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(g) Clear the DTCs DTC Check / Clear.

(h) Turn the ignition switch OFF.

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

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B181A, B181B, B181C or B181D is not output.

HINT
Codes other than DTC B181A, B181B, B181C and B181D may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTOR

OK -- REPLACE FRONT PASSENGER AIRBAG ASSEMBLY Removal

2. CHECK CONNECTOR

(a) Turn the ignition switch OFF.

(b) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(c) Disconnect SST from connector E.

(d) Check that the instrument panel wire connectors (on the front passenger airbag side) are not damaged.

OK:

The lock button is not disengaged, and the claw of the lock is not deformed or damaged.

NG -- REPLACE NO. 2 INSTRUMENT PANEL WIRE ASSEMBLY
OK -- Continue to next step.

3. CHECK VARIABLE VENT HOLE SQUIB CIRCUIT

(a) Disconnect the connectors from the center airbag sensor.





(b) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(c) Turn the ignition switch ON.

(d) Measure the voltage according to the value(s) in the table below.

Standard voltage:





(e) Turn the ignition switch OFF.

(f) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(g) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(h) Release the activation prevention mechanism built into connector B Diagnosis System.

(i) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE ASSEMBLY)
OK -- Continue to next step.

4. CHECK CENTER AIRBAG SENSOR

(a) Restore the released activation prevention mechanism of connector B to the original condition.





(b) Connect the connectors to the front passenger airbag and the center airbag sensor.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

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

(e) Clear the DTCs DTC Check / Clear.

(f) Turn the ignition switch OFF.

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

(h) Check for DTCs DTC Check / Clear.

Result





HINT
Codes other than DTC B181A, B181B, B181C and B181D may be output at this time, but they are not related to this check.

B -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

A -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

C -- USE SIMULATION METHOD TO CHECK Diagnosis System

5. CHECK INSTRUMENT PANEL WIRE (CENTER AIRBAG SENSOR - NO. 2 INSTRUMENT PANEL WIRE ASSEMBLY)

(a) Restore the released activation prevention mechanism of connector B to the original condition.





(b) Disconnect the instrument panel wire connector from the No. 2 instrument panel wire assembly.

(c) Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.

(d) Turn the ignition switch ON.

(e) Measure the voltage according to the value(s) in the table below.

Standard voltage:





(f) Turn the ignition switch OFF.

(g) Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.

(h) Measure the resistance according to the value(s) in the table below.

Standard resistance:





(i) Release the activation prevention mechanism built into connector B Diagnosis System.

(j) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE INSTRUMENT PANEL WIRE

OK -- REPLACE NO. 2 INSTRUMENT PANEL WIRE ASSEMBLY