2015 Cadillac CTS Owner Manual - Page 293

10-30 Vehicle Care High Intensity Discharge (HID) Lighting LED Lighting This vehicle has several LED lamps. For replacement of any LED lighting assembly, contact your dealer. License Plate Lamp { Warning The high intensity discharge lighting system operates at a very high voltage. If you try to service any of the system components, you could be seriously injured. Have your dealer or a qualified technician service them. After an HID headlamp bulb has been replaced, the beam might be a slightly different shade than it was originally. This is normal. Lamp Assembly Bulb Assembly