DTC B1639/81: Rear Sensor Initialization Incomplete RH: Description

The rear collision sensor circuit (to determine deployment of the rear window curtain shield airbag assembly) is composed of the airbag ECU assembly 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 B1639/81 is stored when a malfunction is detected in the rear airbag sensor RH.

DTC No.	DTC Detection Condition	Trouble Area
B1639/81	The airbag ECU assembly receives a line short circuit signal, an open circuit signal, a short circuit to ground signal or a short circuit to B+ signal in the circuit for the rear side collision sensor RH (to determine deployment of the rear window curtain shield airbag) for 2 seconds. Side airbag sensor assembly RH malfunction Rear airbag sensor RH malfunction Airbag ECU assembly malfunction	Floor wire Side airbag sensor assembly RH Rear airbag sensor RH Airbag ECU assembly