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: Procedure

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connector is properly connected to the front seat outer belt assembly LH.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

4. Disconnect the connector from the front seat outer belt assembly LH.
5. Check that the floor wire connector (on the front seat outer belt assembly LH side) is not damaged.

   OK

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

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

Fig 1: Checking Front Seat Outer Belt LH (Front Pretensioner Squib LH)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

• SST: 09843-18061 

1. Disconnect the connectors from the front seat outer belt assembly LH.
2. Connect SST (resistance 2.1 Ω) to connector C.
   WARNING:

   Never connect a tester to the front seat outer belt assembly 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.
   • Insert SST straight into the terminals of the connector.
3. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
4. Turn the ignition switch to ON, and wait for at least 60 seconds.
5. Clear the DTCs stored in the memory. Refer to DTC CHECK / CLEAR .
6. Turn the ignition switch off.
7. Turn the ignition switch to ON, and wait for at least 60 seconds.
8. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

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

   TEXT IN ILLUSTRATION
   
   

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

   HINT: 

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

NG → See step   3 

OK → See step   8 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect the SST from connector C.
4. Check that the connector is properly connected to the center airbag sensor assembly.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not connected securely, reconnect the connector and proceed to the next inspection.

5. Disconnect the connector from the center airbag sensor assembly.
6. Check that the terminal of the connector is not damaged.

   OK

   The terminal is not deformed or damaged.

7. Check that the short spring for the floor wire connector with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

Fig 2: Checking Floor Wire (Front Pretensioner Squib LH - Center Airbag Sensor Assembly)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Connect the cable to the negative battery terminal, and wait for at least 2 seconds.
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
   G22-1 (L-) - Body ground	Ignition switch ON	Below 1 V
   G22-2 (L+) - Body ground	Ignition switch ON	Below 1 V

   TEXT IN ILLUSTRATION
   
   

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

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
   G22-1 (L-) - G22-2 (L+)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM .
8. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   G22-1 (L-) - G22-2 (L+)	Always	1 MΩ or higher
   G22-1 (L-) - Body ground	Always	1 MΩ or higher
   G22-2 (L+) - Body ground	Always	1 MΩ or higher

9. Restore the released activation prevention mechanism of connector B to the original condition.

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the front seat outer belt assembly LH and the center 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 stored in the memory. Refer to DTC CHECK / CLEAR .
5. Turn the ignition switch off.
6. Turn the ignition switch to ON, and wait for at least 60 seconds.
7. Check the DTCs. Refer to DTC CHECK / CLEAR .

   OK

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

   HINT: 

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

NG → See step   7 

OK → See step   6