B19A8

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B19A5/A6-B19A8/A6: Short in Front Active Headrest Squib LH Circuit

B19A5/A6 - Short in Front Active Headrest Squib LH Circuit
B19A6/A6 - Open in Front Active Headrest Squib LH Circuit
B19A7/A6 - Short to GRD in Front Active Headrest Squib LH Circuit
B19A8/A6 - Short to B+ in Front Active Headrest Squib LH Circuit

DESCRIPTION

The front active headrest squib LH circuit consists of the center airbag sensor and the active headrest inflator LH.

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

These DTCs are recorded when a malfunction is detected in the front active headrest squib LH circuit.

HINT
For vehicles not equipped with active headrest inflators:

Vehicles that are not equipped with active headrest inflators still contain active headrest inflator circuits and use substitution parts in replace of the active headrest inflators. If a malfunction occurs in this active headrest inflator circuit, DTC B19A5, B19A6, B19A7 or B19A8 is stored.





WIRING DIAGRAM





INSPECTION PROCEDURE

HINT
* Change the intelligent tester to the "check mode" (signal check) with the intelligent tester Check Mode Procedure.
* After selecting the "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 ACTIVE HEADREST INFLATOR LH (FRONT ACTIVE HEADREST SQUIB LH)





(a) Turn the engine switch off.

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

(c) Disconnect the connector from the active headrest inflator LH.

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

CAUTION:
Never connect a tester to the active headrest inflator LH (front active headrest squib LH) 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 engine switch on (IG), and wait for at least 60 seconds.

(g) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(h) Turn the engine switch off.

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

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

OK:

DTC B19A5, B19A6, B19A7, B19A8 or A6 is not output.

HINT
Codes other than DTC B19A5, B19A6, B19A7, B19A8 and A6 may be output at this time, but they are not related to this check.

NG -- CHECK FRONT ACTIVE HEADREST SQUIB LH CIRCUIT

OK -- REPLACE ACTIVE HEADREST INFLATOR LH Removal

2. CHECK FRONT ACTIVE HEADREST SQUIB LH CIRCUIT





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

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

(f) Turn the engine switch on (IG).

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

Standard voltage:





(h) Turn the engine switch off.

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

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

Standard resistance:





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

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

Standard resistance:





Result





A -- CHECK CENTER AIRBAG SENSOR
B -- Continue to next step.

3. CHECK FRONT SEAT WIRE LH





(a) Disconnect the No. 2 floor wire connector from the front seat wire LH.

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

(c) Turn the engine switch on (IG).

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

Standard voltage:





(e) Turn the engine 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 D Diagnosis System.

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

Standard resistance:





NG -- REPLACE FRONT SEAT WIRE LH

OK -- REPLACE NO. 2 FLOOR WIRE

4. CHECK CENTER AIRBAG SENSOR





(a) Connect the connectors to the active headrest inflator LH and the center airbag sensor.

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

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

(d) Clear the DTCs Reading and Clearing Diagnostic Trouble Codes.

(e) Turn the engine switch off.

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

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

OK:

DTC B19A5, B19A6, B19A7, B19A8 or A6 is not output.

HINT
Codes other than DTC B19A5, B19A6, B19A7, B19A8 and A6 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 Diagnosis System