B19A0

SUPPLEMENTAL RESTRAINT SYSTEM: AIRBAG SYSTEM: B19A0/A5-B19A3/A5: Short in Front Active Headrest Squib RH Circuit

B19A0/A5 - Short in Front Active Headrest Squib RH Circuit
B19A1/A5 - Open in Front Active Headrest Squib RH Circuit
B19A2/A5 - Short to GRD in Front Active Headrest Squib RH Circuit
B19A3/A5 - Short to B+ in Front Active Headrest Squib RH Circuit

DESCRIPTION

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

This 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 RH 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 B19A0, B19A1, B19A2 or B19A3 is stored.

WIRING DIAGRAM

INSPECTION PROCEDURE

NOTICE:
* w/ Navigation System (for HDD):
After the power switch is turned OFF, the display and navigation module display (HDD navigation system) records various types of memory and settings. As a result, after turning the power switch OFF, be sure to wait for the time specified in the following table before disconnecting the cable from the negative (-) battery terminal.

Waiting Time before Disconnecting Cable from Negative (-) Battery Terminal:

* When disconnecting the cable, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.

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 ACTIVE HEADREST INFLATOR RH (FRONT ACTIVE HEADREST SQUIB RH)

(a) Turn the power 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 RH.

(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 RH (front active headrest squib RH) 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 power switch ON (IG), and wait for at least 60 seconds.

(g) Clear the DTCs DTC Check / Clear.

(h) Turn the power switch OFF.

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

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B19A0, B19A1, B19A2, B19A3 or A5 is not output.

HINT
Codes other than DTC B19A0, B19A1, B19A2, B19A3 and A5 may be output at this time, but they are not related to this check.

NG -- CHECK CONNECTOR

OK -- REPLACE ACTIVE HEADREST INFLATOR RH Removal

2. CHECK CONNECTOR

(a) Turn the power 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 floor wire connector (on the active headrest inflator RH side) is not damaged.

OK:

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

NG -- REPLACE FLOOR WIRE
OK -- Continue to next step.

3. CHECK FRONT ACTIVE HEADREST SQUIB RH 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 power switch ON (IG).

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

Standard voltage:

(e) Turn the power 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:

Result

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

4. CHECK FRONT SEAT WIRE RH

(a) Disconnect the floor wire connector from the rear seat wire.

(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 RH

OK -- REPLACE FLOOR WIRE

5. CHECK CENTER AIRBAG SENSOR

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

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

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

(d) Clear the DTCs DTC Check / Clear.

(e) Turn the power switch OFF.

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

(g) Check for DTCs DTC Check / Clear.

OK:

DTC B19A0, B19A1, B19A2, B19A3 or A5 is not output.

HINT
Codes other than DTC B19A0, B19A1, B19A2, B19A3 and A5 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