DTC B1638: Curtain Shield Airbag Sensor Initialization Error (LH) [12/2019 - 11/2023]: Description

The side collision sensor LH circuit (bus 1) consists of the airbag sensor assembly, side airbag sensor assembly LH and rear airbag sensor LH.

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

DTC B1638 is stored when a malfunction is detected in the side collision sensor LH circuit (bus 1).

DTC No.	Detection Item	DTC Detection Condition	Trouble Area	Warning Indicate	Test Mode / Check Mode
B1638	Curtain Shield Airbag Sensor Initialization Error (LH)	The airbag sensor assembly detects a line short, short to ground or B+, or an open in the side collision sensor LH circuit (bus 1). Rear airbag sensor LH malfunction Airbag sensor assembly malfunction	No. 2 floor wire Front door wire LH Rear airbag sensor LH Airbag sensor assembly	Comes on	Does not apply to test/check mode