Circuit/System Description

WARNING: This page is about a different car, the 2020 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The side blind zone alert system helps alert drivers to avoid changing lanes when vehicles are detected in the side blind zone of the adjacent lane.

The side blind zone alert system utilized two controls modules, the B218L Side Obstacle Detection Control Module - Left and the B218R Side Obstacle Detection Control Module - Right. Each B218 Side Obstacle Detection Control Module contains a radar and is located at the rear corner of the vehicle, behind the fasica. The B218L Side Obstacle Detection Control Module - Left and the B218R Side Obstacle Detection Control Module - Right communicate with one another on a private CAN bus and with the rest of the vehicle on CAN bus 4.

The side blind zone alert systems uses the P43D Side Object Detection Indicator - Driver and P43P Side Object Detection Indicator - Passenger, located in the driver and passenger outside rearview mirror glass, to alert the driver to when vehicles are detected in the side blind zone of the adjacent lane. The B218L Side Obstacle Detection Control Module - Left and the B218R Side Obstacle Detection Control Module - Right will send a CAN message to the K9 Body Control Module when requesting the driver or passenger indicator be illuminated. The K9 Body Control Module then sends a LIN message to the S79D Front Side Door Window Control Switch - Driver or S79P Front Side Door Window Switch - Passenger with the indicator request. The S79D Front Side Door Window Control Switch - Driver or S79P Front Side Door Window Switch - Passenger will apply voltage to circuit 1760 or 1761 to illuminate the indicator. Each indicator receives a constant chassis ground on circuit 2150 or 2250.