2009 Cadillac CTS Owner's Manual - Page 364

Bulb Replacement For the proper type of replacement bulbs, see Replacement Bulbs on page 5-61. For any bulb changing procedure not listed in this section, contact your dealer/retailer. High Intensity Discharge (HID) Lighting 9. Make sure that the light from the headlamp is positioned at the bottom edge of the horizontal tape line. The lamp on the left (A) shows the correct headlamp aim. The lamp on the right (B) shows the incorrect headlamp aim. 10. Repeat Steps 7 through 9 for the opposite headlamp. { CAUTION: The High Intensity Discharge (HID) 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/retailer or a qualified technician service them. 5-58