DTC B166C/4A: Front Door Pressure Sensor RH; DTC B166F/4A: Front Door Pressure Sensor Threshold Malfunction (RH) [03/2017 - 04/2020]: 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 [03/2017 - 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 [03/2017 - 04/2020]

   Body Electrical > SRS Airbag > Trouble Codes 

   Result

   Result	Proceed to
   DTC B166C/4A or B166F/4A is output.	A
   DTC B167A/5A or B167E/5A is output.	B
   DTCs B166C/4A, B166F/4A, B167A/5A and B167E/5A are not output.	C

   HINT: 

   Codes other than DTCs B166C/4A, B166F/4A, B167A/5A and B167E/5A 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: 

A 

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

Result: 

B 

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

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [03/2017 - 04/2020]