AIRBAG SYSTEM(w/ Occupant Classification System), Diagnostic DTC:B1820/55,B1821/55,B1822/55 and B1823/55

DESCRIPTION

WIRING DIAGRAM

CAUTION / NOTICE / HINT

PROCEDURE

1. CHECK FRONT SEAT AIRBAG ASSEMBLY RH (FRONT SIDE SQUIB RH)

   1. 

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

      Turn the ignition switch off.

   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 assembly RH.

   4. Connect the red wire side of SST (resistance: 2.1 Ω) to connector C.

      CAUTION:

      Never connect the tester to the front seat airbag assembly RH (front 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 SST.

      • Insert SST straight into the terminals of the connector.

   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.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

   8. Turn the ignition switch off.

   9. Turn the ignition switch to ON, and wait for at least 60 seconds.

   10. Check for DTCs.

       Click here

       Body Electrical > SRS Airbag > Trouble Codes

       OK

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

       Tip:

       Codes 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.

   11. Turn the ignition switch off.

   12. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

   13. Disconnect SST from connector C.

   09843-18061

   Result

   Proceed to
   OK (for Power Seat)
   OK (for Manual Seat)
   NG

   OK (for Power Seat)

   REPLACE FRONT SEAT AIRBAG ASSEMBLY RH

   Click here

   OK (for Manual Seat)

   REPLACE FRONT SEAT AIRBAG ASSEMBLY RH

   Click here

   NG

2. CHECK CONNECTORS

   1. Disconnect the connectors from the airbag sensor assembly.

   2. 

      *1	Front Side Squib RH
      *2	Floor Wire
      *3	Airbag Sensor Assembly

      Check that the connectors (on the airbag sensor assembly side and front seat airbag assembly RH side) are not damaged.

      OK

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

   Result

   Proceed to
   OK
   NG

   NG

   REPLACE FLOOR WIRE

   OK

3. CHECK FRONT SIDE SQUIB RH CIRCUIT

   1. 

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

      Connect the cable to the negative (-) battery terminal, 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
      Mr1-1 (SFR+) - Body ground	Ignition switch ON	Below 1 V
      Mr1-2 (SFR-) - Body ground	Ignition switch ON	Below 1 V

   4. Turn the ignition switch off.

   5. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Mr1-1 (SFR+) - Mr1-2 (SFR-)	Always	Below 1 Ω

   7. Release the activation prevention mechanism built into connector B.

      Click here

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

      Standard Resistance

      Tester Connection	Condition	Specified Condition
      Mr1-1 (SFR+) - Mr1-2 (SFR-)	Always	1 MΩ or higher

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

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

       Standard Resistance

       Tester Connection	Condition	Specified Condition
       Mr1-1 (SFR+) - Body ground	Always	1 MΩ or higher
       Mr1-2 (SFR-) - Body ground	Always	1 MΩ or higher

   Result

   Proceed to
   OK
   NG

   NG

   REPLACE FLOOR WIRE

   OK

4. CHECK AIRBAG SENSOR ASSEMBLY

   1. 

      *1	Front Side Squib RH
      *2	Airbag Sensor Assembly

      Connect the connectors to the front seat airbag assembly RH and airbag sensor assembly.

   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.

      Click here

      Body Electrical > SRS Airbag > Clear DTCs

   5. Turn the ignition switch off.

   6. Turn the ignition switch to ON, and wait for at least 60 seconds.

   7. Check for DTCs.

      Click here

      Body Electrical > SRS Airbag > Trouble Codes

      Tip:

      Codes 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.

   Result

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

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

   USE SIMULATION METHOD TO CHECK

   Click here

   DTC B1820/55, B1821/55, B1822/55 or B1823/55 is output

   REPLACE AIRBAG SENSOR ASSEMBLY

   Click here