DTC B1633: Curtain Shield Airbag Sensor Initialization Error (RH); DTC B1638: Curtain Shield Airbag Sensor Initialization Error (LH) [08/2019 - ]: Description

The circuit for the side collision sensor LH or RH (to determine deployment of the front seat side airbag LH or RH and curtain shield airbag LH or RH) is composed of the airbag sensor assembly, 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 sensor 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 rear collision sensor LH or RH (to determine deployment of the curtain shield airbag LH or RH).

DTC Code	DTC Detection Condition	Trouble Area
B1633	One of the following conditions is met: The airbag sensor 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 rear collision sensor RH (to determine deployment of the curtain shield airbag RH) for 2 seconds. A rear airbag sensor RH malfunction. A side airbag sensor RH malfunction. An airbag sensor assembly malfunction.	Floor wire Rear airbag sensor RH Side airbag sensor assembly RH Airbag sensor assembly
B1638	One of the following conditions is met: The airbag sensor 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 rear collision sensor LH (to determine deployment of the curtain shield airbag LH) for 2 seconds. A rear airbag sensor LH malfunction. A side airbag sensor LH malfunction. An airbag sensor assembly malfunction.	No. 2 floor wire Rear airbag sensor LH Side airbag sensor assembly LH Airbag sensor assembly