How To Replace Taillight and Bulb 04-07 Cadillac CTS
Difficulty: Beginner · About 30 min · Cadillac Cts
Replace a taillight bulb or assembly on a 2004–2007 Cadillac CTS by removing the trunk liner, disconnecting the lamp, and securing the replacement with its wiring routed correctly.
Tools you will need
- 10mm socket and ratchet
- Trim clip tool
Parts and supplies
- Taillight assembly or bulb
Steps
- Remove the trunk liner
Take out the spare tire cover, release the five plastic clips, and move the liner and insulation aside. Disconnect the taillight harness and remove its two 10mm retaining nuts.
- Remove the lamp assembly
Feed the harness through the body opening and ease the taillight outward. Keep the wiring clear of sharp edges and inspect the gasket before installing a new housing.
- Replace the bulb if needed
Press the socket tab and rotate the holder counterclockwise. Remove the failed bulb, fit the correct replacement, and twist the socket clockwise until it locks.
- Install and test the taillight
Feed the harness through the opening and align the assembly with the body. Reconnect the plug, reinstall the two nuts, and return the insulation, liner clips, and spare tire cover; verify lamp operation.
Check your vehicle’s repair manual for exact specifications and fit.