DTC B1900/73: Short in Front Pretensioner Squib RH Circuit; DTC B1901/73: Open in Front Pretensioner Squib RH Circuit; DTC B1902/73: Short to GND in Front Pretensioner Squib RH Circuit; DTC B1903/73: Short to B+ in Front Pretensioner Squib RH Circuit: Procedure

1. Turn the ignition switch off.
   Fig 1: Checking Front Seat Outer Belt RH (Front Pretensioner Squib RH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 RH.
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 RH (front pretensioner squib RH) 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 .
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 .

    OK

    DTC B1900, B1901, B1902 or B1903 is not output.

    HINT: 

    Codes other than DTC B1900, B1901, B1902 and B1903 may be output at this time, but they are not related to this check.

    TEXT IN ILLUSTRATION
    
    

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

NG → See step   2 

OK → See step   5 

1. Turn the ignition switch off.
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Disconnect the connectors from the center airbag sensor.
5. Check that the connectors (on the center airbag sensor side and front seat outer belt RH side) are not damaged.

   OK

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

   Fig 2: Checking Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Front Pretensioner Squib RH
   *2	No. 2 Floor Wire
   *3	Center Airbag Sensor

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
   Fig 3: Checking No. 2 Floor Wire (Front Pretensioner Squib RH Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   J2-1 (R+) - Body ground	Ignition switch ON	Below 1 V
   J2-2 (R-) - Body ground	Ignition switch ON	Below 1 V

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J2-1 (R+) - J2-2 (R-)	Always	Below 1 Ω

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

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J2-1 (R+) - J2-2 (R-)	Always	1 MΩ or higher
   J2-1 (R+) - Body ground	Always	1 MΩ or higher
   J2-2 (R-) - Body ground	Always	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the front seat outer belt RH and center airbag sensor.
   Fig 4: Identifying Center Airbag Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 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 for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1900, B1901, B1902 or B1903 is not output.

   HINT: 

   Codes other than DTC B1900, B1901, B1902 and B1903 may be output at this time, but they are not related to this check.

   TEXT IN ILLUSTRATION
   
   

   *1	Front Pretensioner Squib RH
   *2	Center Airbag Sensor

NG → See step   6 

OK → See step   7