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 power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
3. Disconnect the connectors from the front seat outer belt assembly 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 assembly RH (front seat belt pretensioner 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 (-) auxiliary battery terminal, and wait for at least 2 seconds.
6. Turn the power switch on (IG), and wait for at least 60 seconds.
7. Clear the DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .
8. Turn the power switch off.
9. Turn the power switch on (IG), and wait for at least 60 seconds.
10. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

    OK

    DTC B1900/73, B1901/73, B1902/73 or B1903/73 is not output.

    HINT: 

    Codes other than DTC B1900/73, B1901/73, B1902/73 and B1903/73 may be output at this time, but they are not related to this check.

    TEXT IN ILLUSTRATION
    
    

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

NG → See step   2 

OK → See step   5 

1. Turn the power switch off.
2. Disconnect the cable from the negative (-) auxiliary battery terminal, and wait for at least 90 seconds.
3. Disconnect SST from connector C.
4. Disconnect the connectors from the center airbag sensor assembly.
5. Check that the connectors (on the center airbag sensor assembly side and front seat outer belt assembly RH 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, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	Front Seat Belt Pretensioner RH
   *2	Floor Wire
   *3	Center Airbag Sensor Assembly

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Turn the power switch on (IG).
3. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   T8-1 (R+) - Body ground	Power switch on (IG)	Below 1 V
   T8-2 (R-) - Body ground	Power switch on (IG)	Below 1 V

4. Turn the power switch off.
5. Disconnect the cable from the negative (-) auxiliary 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
   T8-1 (R+) - T8-2 (R-)	Always	Below 1 Ω

7. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM [03/2012 - ] .
8. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   T8-1 (R+) - T8-2 (R-)	Always	1 MΩ or higher
   T8-1 (R+) - Body ground	Always	1 MΩ or higher
   T8-2 (R-) - Body ground	Always	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

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

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

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

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect the cable to the negative (-) auxiliary battery terminal, and wait for at least 2 seconds.
3. Turn the power switch on (IG), and wait for at least 60 seconds.
4. Clear the DTCs stored in memory. Refer to DTC CHECK / CLEAR [03/2012 - ] .
5. Turn the power switch off.
6. Turn the power switch on (IG), and wait for at least 60 seconds.
7. Check for DTCs. Refer to DTC CHECK / CLEAR [03/2012 - ] .

   OK

   DTC B1900/73, B1901/73, B1902/73 or B1903/73 is not output.

   HINT: 

   Codes other than DTC B1900/73, B1901/73, B1902/73 and B1903/73 may be output at this time, but they are not related to this check.

   TEXT IN ILLUSTRATION
   
   

   *1	Front Seat Belt Pretensioner RH
   *2	Center Airbag Sensor Assembly

NG → See step   6 

OK → See step   7