DTC B1771: Passenger Side Buckle Switch Circuit Malfunction [09/2015 - 08/2019]: Procedure

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Check that the connector is properly connected to the occupant detection ECU.

   OK

   The connector is properly connected.

   HINT: 

   If the connector is not properly connected, reconnect the connector and proceed to the next inspection.

4. Disconnect the connector from the occupant detection ECU.
5. Check that the terminals of the connector are not deformed or damaged.

   OK

   The terminals are not deformed or damaged.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019] 

Result: 

OK 

See step  2

1. Connect the connector to the occupant detection ECU.
2. Connect the cable to the negative (-) battery terminal.
3. Clear the DTCs stored in the occupant detection ECU.

   Refer to DTC CHECK / CLEAR [09/2015 - ]

   Body Electrical > Occupant Detection > Clear DTCs 

4. Clear the DTCs stored in the airbag sensor assembly.

   Refer to DTC CHECK / CLEAR [09/2015 - 08/2019]

   Body Electrical > SRS Airbag > Clear DTCs 

5. Turn the engine switch off.
6. Turn the engine switch on (IG), and wait for at least 10 seconds.
7. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2015 - ]

   Body Electrical > Occupant Detection > Trouble Codes 

   OK

   DTC B1771 is not output.

   HINT: 

   Codes other than DTC B1771 may be output at this time, but they are not related to this check.

8. Turn the engine switch off.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [09/2015 - 08/2016]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [08/2016 - 12/2017]  , or refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2017 - 08/2019] 

Result: 

NG 

See step  3

1. Disconnect the cable from the negative (-) battery terminal.
2. Replace the front seat inner belt assembly RH with a known good one.

   Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019]

   HINT: 

   Perform the following inspection using known good parts from another vehicle if possible.

3. Connect the cable to the negative (-) battery terminal.
4. Clear the DTCs stored in the occupant detection ECU.

   Refer to DTC CHECK / CLEAR [09/2015 - ]

   Body Electrical > Occupant Detection > Clear DTCs 

5. Clear the DTCs stored in the airbag sensor assembly.

   Refer to DTC CHECK / CLEAR [09/2015 - 08/2019]

   Body Electrical > SRS Airbag > Clear DTCs 

6. Turn the engine switch off.
7. Turn the engine switch on (IG), and wait for at least 10 seconds.
8. Check for DTCs.

   Refer to DTC CHECK / CLEAR [09/2015 - ]

   Body Electrical > Occupant Detection > Trouble Codes 

   OK

   DTC B1771 is not output.

   HINT: 

   Codes other than DTC B1771 may be output at this time, but they are not related to this check.

9. Turn the engine switch off.
10. Disconnect the cable from the negative (-) battery terminal.
11. Restore the front seat inner belt assembly RH that was installed for testing to its original location.

    Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019]

    Result

    Proceed to
    OK
    NG

Result: 

OK 

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH. Refer to  REMOVAL [09/2015 - 08/2016]  , or refer to  REMOVAL [08/2016 - 08/2019] 

Result: 

NG 

See step  4

1. Turn the engine switch off.
2. Disconnect the cable from the negative (-) battery terminal.
3. Replace the occupant detection ECU with a new one.

   Refer to REMOVAL [09/2015 - 08/2016] , or refer to REMOVAL [08/2016 - 08/2019]

4. Connect the cable to the negative (-) battery terminal.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  5

1. Using the Techstream, perform Zero Point Calibration.

   Refer to INITIALIZATION [09/2015 - ]

   Body Electrical > Occupant Detection > Utility 

   Tester Display
   Zero Point Calibration

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END