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Home >> Lexus >> 2021 >> LC 500 2D Coupe >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System - Diagnostic Codes (Coupe) (3 Of 5) >> Airbag System >> DTC B166C/4A: Front Door Pressure Sensor RH; DTC B166F/4A: Front Door Pressure Sensor Threshold Malfunction (RH) [03/2017 - 04/2020] >> Description

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

The side collision sensor RH circuit consists of the airbag ECU assembly, door side airbag sensor RH, side airbag sensor assembly RH and rear airbag sensor RH.

The door side airbag sensor RH, side airbag sensor assembly RH and rear airbag sensor RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbags and pretensioners should be deployed.

These DTCs are stored when a malfunction is detected in the door side airbag sensor RH.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B166C/4A Front Door Pressure Sensor RH
  • Door side airbag sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Door side airbag sensor RH
  • Airbag ECU assembly
Comes on Not applicable
B166F/4A Front Door Pressure Sensor Threshold Malfunction (RH)
  • Door side airbag sensor RH malfunction
  • Airbag ECU assembly malfunction
  • Door side airbag sensor RH
  • Airbag ECU assembly
Comes on Not applicable