DTC B1905-74: Short in Front Pretensioner Squib LH Circuit; DTC B1906-74: Open in Front Pretensioner Squib LH Circuit; DTC B1907-74: Short to GND in Front Pretensioner Squib LH Circuit; DTC B1908-74: Short to B+ in Front Pretensioner Squib LH Circuit [12/2012 - ]: Procedure

1. Turn the ignition switch off.

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   *1	Front Pretensioner Squib LH
   *2	Airbag Sensor Assembly
   *3	Connector C
   *4	SST
   *a	Front view of wire harness connector (to Front Pretensioner Squib LH)

2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the connectors from the front seat outer belt assembly LH.
4. Connect the white wire side of SST (resistance: 2.1 Ω) to connector C.
   WARNING:

   Never connect the tester to the front seat outer belt assembly LH (front pretensioner squib LH) for measurement, as this may lead to a serious injury due to airbag deployment.

   NOTE:

   • 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 
5. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ] .

   Body Electrical > SRS Airbag > Clear DTCs 

8. Turn the ignition switch off.
9. Turn the ignition switch to ON, and wait for at least 60 seconds.
10. Check for DTCs.

    Refer to DTC CHECK / CLEAR [12/2012 - ] .

    Body Electrical > SRS Airbag > Trouble Codes 

    Result	Proceed to
    	DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output
    	DTC B1905/74, B1906/74, B1907/74 or B1908/74 is output

    HINT: 

    Codes other than DTC B1905/74, B1906/74, B1907/74 and B1908/74 may be output at this time, but they are not related to this check.

11. Turn the ignition switch off.
12. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
13. Disconnect SST from connector C.

Result: 

DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output 

REPLACE FRONT SEAT OUTER BELT ASSEMBLY LH. Refer to  REMOVAL [12/2012 - ]  . 

Result: 

DTC B1905/74, B1906/74, B1907/74 or B1908/74 is output 

See step  2

1. Disconnect the connectors from the airbag sensor assembly.
2. Check that the connectors (on the airbag sensor assembly side and front seat outer belt assembly LH side) are not damaged.

   OK

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

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   *1	Front Pretensioner Squib LH
   *2	No. 2 Floor Wire
   *3	Airbag Sensor Assembly

   Result	Proceed to
   	OK
   	NG

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  3

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

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   *1	Front Pretensioner Squib LH
   *2	No. 2 Floor Wire
   *3	Airbag Sensor Assembly
   *5	Connector C
   *a	Front view of wire harness connector (to Front Pretensioner Squib LH)

2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   N7-1 (L-) - Body ground	Ignition switch ON	Below 1 V
   N7-2 (L+) - Body ground	Ignition switch ON	Below 1 V

4. Turn the ignition switch off.
5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
6. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N7-1 (L-) - N7-2 (L+)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B.

   Refer to DIAGNOSIS SYSTEM [12/2012 - ] .

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   N7-1 (L-) - N7-2 (L+)	Always	1 MΩ or higher

9. Restore the released activation prevention mechanism of connector B to its original condition.
10. Measure the resistance according to the value(s) in the table below.

    Standard Resistance

    Tester Connection	Condition	Specified Condition
    N7-1 (L-) - Body ground	Always	1 MΩ or higher
    N7-2 (L+) - Body ground	Always	1 MΩ or higher

    Result	Proceed to
    	OK
    	NG

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  4

1. Connect the connectors to the front seat outer belt assembly LH and airbag sensor assembly.

   Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

   *1	Front Pretensioner Squib LH
   *2	Airbag Sensor Assembly

2. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
3. Turn the ignition switch to ON, and wait for at least 60 seconds.
4. Clear the DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ] .

   Body Electrical > SRS Airbag > Clear DTCs 

5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check for DTCs.

   Refer to DTC CHECK / CLEAR [12/2012 - ] .

   Body Electrical > SRS Airbag > Trouble Codes 

   Result	Proceed to
   	DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output
   	DTC B1905/74, B1906/74, B1907/74 or B1908/74 is output

   HINT: 

   Codes other than DTC B1905/74, B1906/74, B1907/74 and B1908/74 may be output at this time, but they are not related to this check.

Result: 

DTC B1905/74, B1906/74, B1907/74 or B1908/74 is not output 

USE SIMULATION METHOD TO CHECK. Refer to  DIAGNOSIS SYSTEM [12/2012 - ]  . 

Result: 

DTC B1905/74, B1906/74, B1907/74 or B1908/74 is output 

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [12/2012 - ]  .