DTC B1901-73: Open in Front Pretensioner Squib RH Circuit [06/2015 - ]: Procedure

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Seat Outer Belt Assembly RH
   *2	Airbag Sensor Assembly
   *3	No. 2 Floor Wire

2. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the front seat outer belt assembly RH and airbag sensor assembly.

   OK

   The connectors are properly connected.

   HINT: 

   If the connectors are not properly connected, reconnect the connectors and proceed to the next inspection.

4. Disconnect the connectors from the front seat outer belt assembly RH and airbag sensor assembly.
5. Check that the terminals of the connectors are not damaged.

   OK

   The terminals are not deformed or damaged.

6. Check that the No. 2 floor wire connector (on the front seat outer belt assembly RH side) is not damaged.

   OK

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

7. Check that the short spring for the No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  2

1. Check for an open in the circuit.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Seat Outer Belt Assembly RH
   *2	Airbag Sensor Assembly
   *3	No. 2 Floor Wire
   *a	Front view of wire harness connector (to Front Seat Outer Belt Assembly RH)

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Q4-1 (R+) - Q4-2 (R-)	Always	Below 1 Ω

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  3

1. Connect the connectors to the airbag sensor assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Seat Outer Belt Assembly RH
   *2	Airbag Sensor Assembly
   *a	Front view of wire harness connector (to Front Seat Outer Belt Assembly RH)
   *b	Service Wire

2. Using a service wire, connect terminals 1 (R+) and 2 (R-) of connector C.
   NOTE:

   Do not forcibly insert the service wire into the terminals of the connector when connecting the wire.

3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Turn the power switch on (IG), and wait for at least 60 seconds.
5. Clear the DTCs stored in memory.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > SRS Airbag > Clear DTCs 

6. Turn the power switch off.
7. Turn the power switch on (IG), and wait for at least 60 seconds.
8. Check for DTCs.

   Refer to DTC CHECK / CLEAR [06/2015 - ]

   Body Electrical > SRS Airbag > Trouble Codes 

   OK

   DTC B1901/73 is not output.

   HINT: 

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

9. Turn the power switch off.
10. Disconnect the cable from the negative (-) auxiliary battery terminal and wait for at least 90 seconds.
11. Disconnect the service wire from connector C.

    Result

    Proceed to
    OK
    NG

Result: 

NG 

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ] 

Result: 

OK 

See step  4

1. Connect the connectors to the front seat outer belt assembly RH.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Front Seat Outer Belt Assembly RH
   *2	Airbag Sensor Assembly

2. Connect the cable to the negative (-) auxiliary battery terminal.
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 [06/2015 - ]

   Body Electrical > SRS Airbag > Clear DTCs 

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 [06/2015 - ]

   Body Electrical > SRS Airbag > Trouble Codes 

   OK

   DTC B1901/73 is not output.

   HINT: 

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

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [06/2015 - 11/2018]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [11/2018 - ] 

Result: 

NG 

REPLACE FRONT SEAT OUTER BELT ASSEMBLY RH. Refer to  REMOVAL [06/2015 - 11/2018]  , or refer to  REMOVAL [11/2018 - ]