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 Side Squib LH And Center Airbag Sensor Assembly Connectors

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Check that the connectors are properly connected to the front seat side airbag assembly LH and center airbag sensor assembly.

   OK

   The connectors are properly connected.

   HINT: 

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

4. Disconnect the connectors from the front seat side airbag assembly LH and center 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 short spring for the floor wire 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 

1. Connect the connector to the center airbag sensor assembly.
   Fig 2: Checking Front Seat Side Airbag Assembly LH Using SST (Side Squib LH)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect SST (resistance 2.1 Ω) to connector C.
   WARNING:

   Never connect a tester to the front seat side airbag assembly 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.
   • Insert SST straight into the terminals of the connector.
   • SST: 09843-18061 
3. Connect the cable to the negative (-) battery terminal.
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 for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1825, B1826, B1827, B1828, or 56 is not output.

   HINT: 

   Codes other than DTC B1825, B1826, B1827, B1828, and 56 may be output at this time, but they are not related to this check.

NG → See step   3 

OK → See step   5 

1. Turn the ignition switch off.
   Fig 3: Checking Floor Wire (Side Squib LH Circuit) And L9 Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 floor wire from the center airbag sensor assembly.
5. Check for a short to B+ in the circuit.
   1. Connect the cable to the negative (-) battery terminal.
   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
      L9-1 (SFL+) - Body ground	Ignition switch ON	Below 1 V
      L9-2 (SFL-) - Body ground	Ignition switch ON	Below 1 V

6. Check for an open in the circuit.
   1. Turn the ignition switch off.
   2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L9-1 (SFL+) - L9-2 (SFL-)	Always	Below 1 Ω

7. Check for a short to ground in the circuit.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L9-1 (SFL+) - Body ground	Always	1 MΩ or higher
      L9-2 (SFL-) - Body ground	Always	1 MΩ or higher

8. Check for a short in the circuit.
   1. Release the activation prevention mechanism built into connector B. Refer to DIAGNOSIS SYSTEM .
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      L9-1 (SFL+) - L9-2 (SFL-)	Always	1 MΩ or higher

NG → REPLACE FLOOR WIRE 

OK: Go to next step 

1. Restore the released activation prevention mechanism of connector B to the original condition.
   Fig 4: Checking Center Airbag Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the connectors to the front seat side airbag assembly LH and the center airbag sensor assembly.
3. Connect the cable to the negative (-) battery terminal.
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 for DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1825, B1826, B1827, B1828, or 56 is not output.

   HINT: 

   Codes other than DTC B1825, B1826, B1827, B1828, and 56 may be output at this time, but they are not related to this check.

NG → See step   7 

OK → See step   6