DTC B1820/55: Short in Side Squib RH Circuit; DTC B1821/55: Open in Side Squib RH Circuit; DTC B1822/55: Short to GND in Side Squib RH Circuit; DTC B1823/55: Short to B+ in Side Squib RH Circuit [10/2014 - ]: Procedure

1. Turn the power switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Disconnect the cable from the negative (-) auxiliary battery terminal.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Check that the connectors are properly connected to the front seat airbag assembly RH and airbag ECU 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 airbag assembly RH and airbag ECU 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 No. 2 floor wire with the activation prevention mechanism is not deformed or damaged.

   OK

   The short spring is not deformed or damaged.

   TEXT IN ILLUSTRATION
   
   

   *1	Front Seat Airbag Assembly RH
   *2	Airbag ECU Assembly
   *3	No. 2 Floor Wire

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  2

1. Connect the connector to the airbag ECU assembly.

   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 airbag assembly RH (side squib 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 it.
   • Insert SST straight into the terminals of the connector.
   • SST: 09843-18061 
3. Connect the cable to the negative (-) auxiliary battery terminal.
4. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
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 [10/2014 - ] ).

   OK

   DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

   HINT: 

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

8. Turn the power switch off.
9. Disconnect the cable from the negative (-) auxiliary battery terminal.
   WARNING:

   Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

10. Disconnect SST from connector C.
    TEXT IN ILLUSTRATION
    
    

    *1	Front Seat Airbag Assembly RH
    *2	Airbag ECU Assembly
    *a	Front view of wire harness connector (to Front Seat Airbag Assembly RH)

Result: 

OK 

REPLACE FRONT SEAT AIRBAG ASSEMBLY RH 

(Refer to REMOVAL [10/2014 - ] )

Result: 

NG 

See step  3

1. Disconnect the No. 2 floor wire from the airbag ECU assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Check for a short to B+ in the circuit.
   1. Connect the cable to the negative (-) auxiliary battery terminal.
   2. Turn the power switch on (IG).
   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection	Condition	Specified Condition
      Kz1-1 (SFR+) - Body ground	Power switch on (IG)	Below 1 V
      Kz1-2 (SFR-) - 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.
      WARNING:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) auxiliary battery terminal to disable the SRS system.

3. Check for an open in the circuit.
   1. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Kz1-1 (SFR+) - Kz1-2 (SFR-)	Always	Below 1 Ω

4. 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
      Kz1-1 (SFR+) - Body ground	Always	1 MΩ or higher
      Kz1-2 (SFR-) - Body ground	Always	1 MΩ or higher

5. Check for a short in the circuit.
   1. Release the activation prevention mechanism built into connector B (Refer to DIAGNOSIS SYSTEM [10/2014 - ] ).
   2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Kz1-1 (SFR+) - Kz1-2 (SFR-)	Always	1 MΩ or higher

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

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

Result: 

NG 

REPLACE NO. 2 FLOOR WIRE 

Result: 

OK 

See step  4

1. Connect the connectors to the front seat airbag assembly RH and airbag ECU assembly.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

2. Connect the cable to the negative (-) auxiliary battery terminal.
3. Clear the DTCs stored in memory (Refer to DTC CHECK / CLEAR [10/2014 - ] ).
4. Turn the power switch off.
5. Turn the power switch on (IG), and wait for at least 60 seconds.
6. Check for DTCs (Refer to DTC CHECK / CLEAR [10/2014 - ] ).

   OK

   DTC B1820/55, B1821/55, B1822/55 or B1823/55 is not output.

   HINT: 

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

   TEXT IN ILLUSTRATION
   
   

   *1	Front Seat Airbag Assembly RH
   *2	Airbag ECU Assembly

Result: 

OK 

USE SIMULATION METHOD TO CHECK 

(Refer to HOW TO PROCEED WITH TROUBLESHOOTING [10/2014 - 10/2015] or HOW TO PROCEED WITH TROUBLESHOOTING [10/2015 - ] )

Result: 

NG 

REPLACE AIRBAG ECU ASSEMBLY 

(Refer to REMOVAL [10/2014 - ] )