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Home >> Lexus >> 2021 >> LS 500h RWD >> Repair and Diagnosis >> Restraints >> Air Bag, SRS >> Airbag System (W/O Advanced Park) - Diagnostic Codes (1 Of 3) >> AIRBAG SYSTEM (w/o Advanced Park) >> DTC B1633: Curtain Shield Airbag Sensor Initialization Error (RH) [10/2020 - 11/2021] >> Description

DTC B1633: Curtain Shield Airbag Sensor Initialization Error (RH) [10/2020 - 11/2021]: Description

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

The rear airbag sensor RH detects impacts to the vehicle and sends signals to the airbag ECU assembly to determine if the airbag should be deployed.

DTC B1633 is stored when a malfunction is detected in the circuit for the side collision sensor RH.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Test Mode / Check Mode
B1633 Curtain Shield Airbag Sensor Initialization Error (RH) One of the following conditions is met:
  • The airbag ECU assembly detects a line short circuit signal, open circuit signal, short circuit to ground signal or short circuit to B+ signal in the circuit for the side collision sensor RH for 2 seconds.
  • A rear airbag sensor RH malfunction.
  • An airbag ECU assembly malfunction.
  • Floor wire
  • Front door wire RH
  • Rear airbag sensor RH
  • Airbag ECU assembly
Comes on Not applicable