Headlight bulb replacement

Do you mean the bulb is stuck in the socket or you can't get the assembly off to access?

Here are the directions for replacement of the headlamp bulb. The attached pics correlate with the directions.

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2005 Cadillac CTS V6-2.8L VIN T
Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement
Vehicle Lighting and Horns Headlamp Headlamp Bulb Service and Repair Removal and Replacement Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement
HEADLAMP ASSEMBLY OR HEADLAMP BULB AND/OR CORNERING, SIDEMARKER, PARK, TURN SIGNAL BULB REPLACEMENT
Headlamp Assembly or Headlamp Bulb and/or Cornering, Sidemarker, Park, Turn Signal Bulb Replacement

Removal Procedure

1. Raise and support the vehicle. Refer to Lifting and Jacking the Vehicle See: Vehicle Lifting > Procedures > Lifting and Jacking the Vehicle in General Information.

Pic 1

2. Remove the push-pin retainers on the air deflector to allow access to fascia extension retainers.
3. Open the hood.
4. Remove the push-pin retainers that secure the appropriate side of the grille and fascia to the upper tie bar.
5. Remove the first push-pin retainer past the center in order to allow the grille to flex.

Pic 2

6. Remove the front fascia extension. Refer to Fascia Extension Replacement - Front See: Front Bumper Cover / Fascia > Removal and Replacement > Fascia Extension Replacement - Front in Bumpers.

Pic 3

7. Remove the bolt (2) that secures the front fascia to the fender.
8. Loosen the bolt (1) that attaches the front fascia to the fender.
9. Pull the front fascia forward to align the fascia studs with enlarged portion of the hole within the key slot in the fender.
10. Gently pull the front fascia downward to disengage it from the front fender.

Pic 4

11. Remove the 3 bolts that secure the headlamp to the vehicle.
12. Disengage headlamp washer hose, if equipped.

Pic 5

Important: A high amount of force is necessary to perform the next step.

13. Pull the headlamp straight forward to disengage the headlamp ball stud from the fender socket.
14. Reach behind the headlamp to disconnect the headlamp electrical connector.
15. Pull the top part of the front fascia and grille assembly forward only far enough to remove the headlamp assembly from the vehicle.
16. Remove the headlamp assembly from the vehicle.
17. Remove the headlamp bulb cover from the headlamp assembly.

Caution: Refer to Halogen Bulb Caution in Cautions and Notices.

18. Remove the headlamp bulb from the headlamp assembly.

Installation Procedure

1. Install the bulb to the headlamp assembly.
2. Install the headlamp bulb cover to the headlamp assembly.
3. Install the headlamp assembly.

Pic 6

4. Pull the top of the front fascia and grille forward to install the headlamp to the vehicle.
5. Install the headlamp assembly to the vehicle.
6. Reach behind the headlamp assembly to connect the headlamp electrical connectors.

Pic 7
Important: It will take a high amount of force to perform the next step.

7. Press headlamp assembly rearward to engage the headlamp ball stud (1) into the fender socket.

Notice: Refer to Fastener Notice See: Vehicle > Technician Safety Information > Fastener Notice in Cautions and Notices.

8. Install the 3 bolts to secure the headlamp to the vehicle.

Tighten the bolts to 6 Nm (53 lb in).

Pic 8

9. Lift the fascia upward in order to insert the fascia studs into the fender key slots.
10. Slide the fascia rearward to attach the fascia to the fender.
11. Install the bolt (1, 2) to secure the fascia to the fender.

Tighten the bolts to 9 Nm (80 lb in).

12. Install the front fascia extension to the vehicle. Refer to Fascia Extension Replacement - Front See: Front Bumper Cover / Fascia > Removal and Replacement > Fascia Extension Replacement - Front in Bumpers.

Pic 9

13. Install the push-pin retainers to secure the upper portion of the front fascia and grille to the upper tie bar.
14. Close the hood.
15. Raise and support vehicle. Refer to Lifting and Jacking the Vehicle See: Vehicle Lifting > Procedures > Lifting and Jacking the Vehicle in General Information.

Pic 10

16. Position the air deflector to the vehicle.
17. Install the push-pin retainers to secure the air deflector to the vehicle.
18. Lower the vehicle.

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Let me know if this helps.

Take care,
Joe

Hi,

Once you have the light assembly off the vehicle, there is a cover on the back, one for the high beam bulb and the other for the low. Remove that round cover. Reach into the housing and grasp the electrical connector / socket and turn it 1/4 turn counterclockwise. Pull straight out on the assembly. Once loose, there is a wiring connector to the bulb. On the side is a retaining clip. Move the clip away from the bulb base and remove the wiring and connector from the bulb. Reverse to reinstall.

Now if the bulb will not come out of the housing, make sure it is turned 1/4 turn as aforementioned and wiggle the light while pulling. There is a rubber o-ring on the light where it contacts the housing that may be dry or corroded causing it to stick. Make sure when the light comes out, that o-ring is with it. Otherwise, you won't get the new one to seat.

Let me know if you get it.

Joe