Download Catera 1. Open the hood. 2. Unscrew the self-locking tab on the radiator cover from the body to remove the radiator cover. 3. Remove the battery. Necessary for left side bulb replacement. 4. Remove the rubber protective cover from the back of the headlamp to reveal the bulb. 5. Separate the bulb fastening tangs. 6. Carefully remove the bulb. 7. Remove the electrical connection from the bulb. To install: 8. Install the electrical connection to the bulb. 9. Snap the fastening tang in place to install the bulb. 10. Install the rubber protective cover to the back of the headlamp. 11. Install the battery. Necessary for left side bulb replacement. 12. Seat the tab to the body of the radiator cover. 13. Secure the radiator cover by turning the self-locking tab. Close the hood Except Catera 1990 1. Make sure the headlight switch is OFF . 2. Remove the front cornering/side marker lamps. 3. Remove the 2 rear headlight assembly nuts. 4. Disconnect the wiring connectors from the headlight bulbs. 5. Remove the 2 screws through the grille and remove the headlight assembly. 6. Disconnect the lamp monitor connections from the headlight assembly. 7. If necessary, remove the headlight bulbs. Fig. Headlight installation-1990 Deville and Fleetwood To install: 8. Install the bulbs in the headlight assembly. 9. Connect the lamp monitor connections. 10. Position the headlight assembly and install the 2 screws through the grille. Tighten to 13 inch lbs. (1.5 Nm).