DTC B166C: Front Door Pressure Sensor RH; DTC B166F: Front Door Pressure Sensor Threshold Malfunction (RH) [04/2020 - 05/2023]: Procedure

1. Turn the engine switch off.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *1	Door Side Airbag Sensor LH
   *2	Rear Airbag Sensor RH

2. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
3. Interchange the door side airbag sensor RH with LH and connect the connectors.
4. Connect the cable to the negative (-) battery terminal, and wait for at least 2 seconds.
5. Turn the engine switch on (IG), and wait for at least 60 seconds.
6. Clear the DTCs stored in memory.

   Refer to DTC CHECK / CLEAR [04/2020 - ]

   Body Electrical > SRS Airbag > Clear DTCs 

7. Turn the engine switch off.
8. Turn the engine switch on (IG), and wait for at least 60 seconds.
9. Check for DTCs.

   Refer to DTC CHECK / CLEAR [04/2020 - ]

   Body Electrical > SRS Airbag > Trouble Codes 

   Result

   Proceed to
   DTC B166C or B166F is output.
   DTC B167A or B167E is output.
   DTCs B166C, B166F, B167A and B167E are not output.

   HINT: 

   Codes other than DTCs B166C, B166F, B167A and B167E may be output at this time, but they are not related to this check.

10. Turn the engine switch off.
11. Disconnect the cable from the negative (-) battery terminal, and wait for at least 90 seconds.
12. Return the door side airbag sensor RH and LH to their original positions and connect the connectors.

Result: 

DTC B166C or B166F is output. 

REPLACE AIRBAG ECU ASSEMBLY. Refer to  REMOVAL [03/2017 - 05/2023] 

Result: 

DTC B167A or B167E is output. 

REPLACE DOOR SIDE AIRBAG SENSOR RH. Refer to  REMOVAL [03/2017 - 05/2023] 

Result: 

DTCs B166C, B166F, B167A and B167E are not output. 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [04/2020 - 05/2023]