DTC B1820/55: Short in Front Driver Side - Side Squib Circuit; DTC B1821/55: Open in Front Driver Side - Side Squib Circuit; DTC B1822/55: Short to GND in Front Driver Side - Side Squib Circuit; DTC B1823/55: Short to B+ in Front Driver Side - Side Squib Circuit: Procedure

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connector from the front seat side airbag assembly LH.
4. Check the No. 2 floor wire connector and terminals (on the front seat side airbag assembly LH side) and check that the connector is properly connected to the front seat side airbag assembly LH.

   Result

   Result	Proceed to
   No problem.	A
   Connector or terminals incorrect.	B
   Connector connected improperly.	C

B → REPLACE NO. 2 FLOOR WIRE 

C → CONNECT CONNECTOR PROPERLY 

A: Go to next step 

1. Disconnect the connector from the front seat side airbag assembly LH.
   Fig 1: Checking Front Seat Side Airbag Assembly LH (Driver Side - Side Squib)

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

   Never connect a tester to the front seat side airbag assembly LH (driver side - side squib) for measurement, as this may lead to a serious injury due to airbag deployment.

   NOTE:

   • Do not forcibly insert the SST into the terminals of the connector when connecting.
   • Insert the SST straight into the terminals of the connector.
   • SST: 09843-18061 
3. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
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 the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1820/55, B1821/55, B1822/55 and B1823/55 are not output.

   HINT: 

   DTCs other than DTC B1820/55, B1821/55, B1822/55 and B1823/55 may be output at this time, but they are not related to this check.

NG → See step   3 

OK → See step   7 

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the SST from connector C.
4. Check the No. 2 floor wire connector and terminals (on the center airbag sensor assembly side) and check that the connector is properly connected to the center airbag sensor assembly.

   Result

   Result	Proceed to
   No problem.	A
   Connector or terminals incorrect.	B
   Connector connected improperly.	C

B → REPLACE NO. 2 FLOOR WIRE 

C → CONNECT CONNECTOR PROPERLY 

A: Go to next step 

Fig 2: Checking No. 2 Floor Wire (Driver Side - Side Squib Circuit)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Turn the ignition switch off.
2. Disconnect the negative (-) terminal cable from the battery, and wait for at least 90 seconds.
3. Disconnect the connectors from the center airbag sensor assembly.
4. Check for short to B+ in the circuit.
   1. Connect the negative (-) terminal cable to the battery, and wait for at least 2 seconds.
   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
      1 - Body ground	Ignition switch ON	Below 1 V
      2 - Body ground	Ignition switch ON	Below 1 V

5. Check for open in the circuit.
   1. Turn the ignition switch off.
   2. Disconnect the negative (-) terminal cable from the battery, 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
      1 - 2	Always	Below 1 Ω

6. Check for 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
      1 - Body ground	Always	1 MΩ or higher
      2 - Body ground	Always	1 MΩ or higher

7. Check for 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
      1 - 2	Always	1 MΩ or higher

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

NG → REPLACE NO. 2 FLOOR WIRE 

OK: Go to next step 

1. Connect the connectors to the front seat side airbag assembly LH and the center airbag sensor assembly.
   Fig 3: Checking Center Airbag Sensor Assembly

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Connect the negative (-) terminal cable to the battery, 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 the 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 the DTCs. Refer to DTC CHECK / CLEAR .

   OK

   DTC B1820/55, B1821/55, B1822/55 and B1823/55 are not output.

   HINT: 

   DTCs other than DTC B1820/55, B1821/55, B1822/55 and B1823/55 may be output at this time, but they are not related to this check.

NG → See step   8 

OK → See step   6