DTC B1635: Curtain Shield Airbag Sensor (LH); DTC B1637: Curtain Shield Airbag Sensor Lost Communication (LH) [12/2019 - 11/2023]: Procedure

1. Turn the ignition switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Rear Airbag Sensor RH
   *2	Airbag Sensor Assembly

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. Interchange the rear airbag sensor LH with RH and connect the connectors.
4. Connect the cable to the negative (-) auxiliary battery terminal.
5. Turn the ignition switch to ON, and wait for at least 60 seconds.
6. Clear the DTCs stored in memory.

   Body Electrical > SRS Airbag > Clear DTCs 

7. Turn the ignition switch off.
8. Turn the ignition switch to ON, and wait for at least 60 seconds.
9. Check for DTCs.

   Body Electrical > SRS Airbag > Trouble Codes 

   HINT: 

   Codes other than DTCs B1630, B1632, B1635 and B1637 may be output at this time, but they are not related to this check.

   Result

   Result	Proceed to
   DTC B1635 or B1637 is output.	A
   DTC B1630 or B1632 is output.	B
   DTCs B1630, B1632, B1635 and B1637 are not output.	C

10. Turn the ignition switch off.
11. 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.

12. Return the rear airbag sensor LH and RH to their original positions and connect the connectors.

Result: 

A 

REPLACE AIRBAG SENSOR ASSEMBLY. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

B 

REPLACE REAR AIRBAG SENSOR LH. Refer to  REMOVAL [12/2019 - 10/2022]  , or refer to  REMOVAL [10/2022 - 11/2023] 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - ]