DTC B1633: Curtain Shield Airbag Sensor Initialization Error (RH); DTC B1638: Curtain Shield Airbag Sensor Initialization Error (LH) [04/2020 - 05/2023]: Description

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

The rear airbag sensor LH or RH detect impacts to the vehicle and send signals to the airbag ECU assembly to determine if the airbag should be deployed.

DTC B1633 or B1638 is stored when a malfunction is detected in the circuit for the side collision sensor LH or 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
B1638	Curtain Shield Airbag Sensor Initialization Error (LH)	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 LH for 2 seconds. A rear airbag sensor LH malfunction. An airbag ECU assembly malfunction.	Floor wire Front door wire LH Rear airbag sensor LH Airbag ECU assembly	Comes on	Not applicable