Diagnostic Aids

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.

Certain factors will affect the operation of the forward collision alert system. Forward collision alert is intended to detect vehicles. It is not intended to warn the driver of any objects that are not detected as a vehicle such as animals, signs, guard rails, bridges, construction barrels, or other stationary or slow moving objects. In some cases the B174W Front View Camera - Windshield may inadvertently detect a vehicle that is not in the path ahead or the system may occasionally provide unrealistic alerts. This could occur with a turning vehicle ahead, guard rails, traffic signs, or other stationary objects. This is normal operation and the vehicle does not need service.

Forward collision alert warnings will not occur unless the forward collision alert system detects a vehicle ahead. When a vehicle is detected, the vehicle ahead indicator will display green. Vehicles may not be detected on curves, highway exit ramps, or hills, due to poor visibility; or if a vehicle ahead is partially blocked by pedestrians or other objects. Forward collision alert will not detect another vehicle ahead until it is completely in the driving lane.

The B174W Front View Camera - Windshield may have trouble functioning under the following scenarios:

Dirty windshield glass or obstruction on windshield. This may included dirt, snow, or ice, a tinted windshield, windshield tint strips, or vinyl strips or graphics on the windshield. Additionally, other obstructions such as brush guards or hood deflectors may obstruct view of the B174W Camera - Windshield and hinder it's ability to identify objects, vehicles, and lane markings.
The B174W Frontview Camera - Windshield is not properly installed. Verify it is snapped into tabs and is secure. Ensure the bracket is in the correct location by comparing to a known good vehicle. This is especially important if the windshield was recently replaced. Some aftermarket windshield may have the B174W Frontview Camera - Windshield in the incorrect location. Improper installation of a replacement windshield may also prevent completion of the learn if the windshield was not centered and leveled in the vehicle's windshield opening.
Driving through snow or fog, or driving directly into the sun.
Driving on windy or hilly roads.