B1906

SUPPLEMENTAL RESTRAINT SYSTEMS: AIRBAG SYSTEM: B1905/74-B1908/74: Short in Front Pretensioner Squib LH Circuit
B1908/74 - Short to B+ in Front Pretensioner Squib LH Circuit

DESCRIPTION

The front pretensioner squib LH circuit consists of the center airbag sensor and front seat outer belt LH.

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

These DTCs are stored when a malfunction is detected in the front pretensioner squib LH circuit.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* W/ Navigation System:
* After the engine switch is turned off, the display and navigation module display (navigation system) records various types of memory and settings. As a result, after turning the engine 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 from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected Repair Instruction - Initialization.
HINT
To perform the simulation method, enter check mode (signal check) with the Techstream Check Mode Procedure, and then wiggle each connector of the airbag system or drive the vehicle on various types of road Diagnosis System.

PROCEDURE

1. CHECK FRONT SEAT OUTER BELT LH (FRONT PRETENSIONER SQUIB LH)

(a) Turn the engine switch off.





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

(c) Disconnect the connectors from the front seat outer belt LH.

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

CAUTION:
Never connect the tester to the front seat outer belt LH (front pretensioner 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 cable to the negative (-) battery terminal, 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 DTC Check / Clear.

(h) Turn the engine switch off.

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

(j) Check for DTCs DTC Check / Clear.

OK:

DTC B1905, B1906, B1907 or B1908 is not output.

HINT
Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

Text in Illustration





NG -- CHECK CONNECTOR

OK -- REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH Removal

2. CHECK CONNECTOR

(a) Turn the engine switch off.

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

(c) Disconnect SST from connector C.

(d) Check that the floor wire connector (on the front seat outer belt LH side) is not damaged.

OK:

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





Text in Illustration





NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

3. CHECK NO. 2 FLOOR WIRE (FRONT PRETENSIONER SQUIB LH CIRCUIT)

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





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

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

Standard Voltage:





(d) Turn the engine switch off.

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

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

Standard Resistance:





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

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

Standard Resistance:





Text in Illustration





NG -- REPLACE NO. 2 FLOOR WIRE
OK -- Continue to next step.

4. CHECK CENTER AIRBAG SENSOR

(a) Connect the connectors to the front seat outer belt LH and center airbag sensor.





(b) Connect the cable to the negative (-) battery terminal, 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 DTC Check / Clear.

(e) Turn the engine switch off.

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

(g) Check for DTCs DTC Check / Clear.

OK:

DTC B1905, B1906, B1907 or B1908 is not output.

HINT
Codes other than DTC B1905, B1906, B1907 and B1908 may be output at this time, but they are not related to this check.

Text in Illustration





NG -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

OK -- USE SIMULATION METHOD TO CHECK Diagnosis System