Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The B63LRB Airbag Side Impact Rear Sensor - Left Sill, and B63RRB Airbag Side Impact Rear Sensor - Right Sill, are sensors that detect acceleration and provide input to the K36 Restraints Control Module. The K36 Restraints Control Module monitors the inputs given by several sensors and when a collision is detected, the control module will trigger certain airbags and seat belt pretensioners, depending on the angle and severity of the impact. The B63 Side Impact Sensors are generally located on the rear door sill, behind the rear quarter trim panel. The B63LRB Airbag Side Impact Rear Sensor - Left Sill, uses circuit 6623 as the signal circuit and circuit 6622 as the low reference circuit. The B63RRB Airbag Side Impact Rear Sensor - Right Sill, uses circuit 6626 as the signal circuit and circuit 6627 as the low reference circuit. The signal circuit on both impact sensors is the control module input and has an internal resistance connected to 5 V. The low reference circuit is grounded through the control module.

For an overview of the component/system, refer to: Supplemental Inflatable Restraint System Description and Operation