Symptoms - Lighting: Notes

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.

NOTE:

The following steps must be completed before using a symptom table.

Perform the Diagnostic System Check - Vehicle before using a symptom table in order to verify that all of the following conditions are true:
- There are no DTCs set.
- The control modules can communicate via the serial data link.
Review the system description and operation in order to familiarize yourself with the system functions. Refer to the following:
- Exterior Lighting Systems Description and Operation
- Interior Lighting Systems Description and Operation