DTC B1825/56: Short in Side Squib LH Circuit; DTC B1826/56: Open in Side Squib LH Circuit; DTC B1827/56: Short to GND in Side Squib LH Circuit; DTC B1828/56: Short to B+ in Side Squib LH Circuit: Procedure

1. Turn the ignition switch off.
   Fig 1: Checking Front Seat Airbag (LH) (Side Squib LH)

   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 connector from the front seat airbag LH.
4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.
   WARNING:

   Never connect the tester to the front seat airbag LH (side 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 .
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 B1825, B1826, B1827 or B1828 is not output.

    HINT: 

    Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

    TEXT IN ILLUSTRATION
    
    

    *1	Side Squib LH
    *2	Center Airbag Sensor
    *3	Connector C
    *4	SST
    *a	Front view of wire harness connector (to Side Squib LH)
    *b	Color: Red

NG → See step   2 

OK → See step   7 

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 airbag LH 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 Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *1	Side Squib LH
   *2	Floor Wire
   *3	Center Airbag Sensor

NG → REPLACE 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 Floor Wire (Side Squib LH 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
   Hz1-1 (SFL+) - Body ground	Ignition switch ON	Below 1 V
   Hz1-2 (SFL-) - 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
   Hz1-1 (SFL+) - Hz1-2 (SFL-)	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
   Hz1-1 (SFL+) - Hz1-2 (SFL-)	Always	1 MΩ or higher
   Hz1-1 (SFL+) - Body ground	Always	1 MΩ or higher
   Hz1-2 (SFL-) - Body ground	Always	1 MΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the front seat airbag LH and center airbag sensor.
   Fig 4: Checking 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. 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 B1825, B1826, B1827 or B1828 is not output.

   HINT: 

   Codes other than DTC B1825, B1826, B1827 and B1828 may be output at this time, but they are not related to this check.

   TEXT IN ILLUSTRATION
   
   

   *1	Side Squib LH
   *2	Center Airbag Sensor

NG → See step   5 

OK → See step   6