How to Assemble Headlights on a 2000 Cadillac STS

Replacing a headlight on a 2000 Cadillac STS is pretty simple. You will need only a screwdriver, wrench and replacement 9005 HB3 bulb for the inner high beam or 9006 HB4 bulb for the outer low beam. Both bulbs can be purchased at nearly all automotive shops.

Things You'll Need

• Phillips screwdriver
• Wrench
• Replacement bulb

Instructions

1. Park the vehicle on a level surface. Turn off the engine and open the hood.

2. Remove the upper filler panel above the headlight assembly by loosening all four screws and then removing the grommets. Remove the two bolts fastening the headlight assembly to the headlight mounting bracket.

3. Pull the headlight assembly straight forward to disengage the pin at the edge of the assembly.

4. Turn the bulb socket counterclockwise to unlock the socket from the assembly. Remove the headlight bulb socket, disconnect the wiring harness from the socket and replace the high beam bulb. To replace the low beam bulb, remove the rubber housing cover on the rear of the assembly and repeat step 4 with the low beam bulb.

5. Reattach the wiring harness to the socket and place the bulb socket back into the assembly. Rotate it clockwise to lock it into place. Push the assembly back into the vehicle and reattach the pin at the edge of the assembly.

6. Reattach the upper filler panel by reinstalling all four screws and the grommets. Close the hood.

Tips & Warnings

• Try to not touch the glass of the replacement bulb with your bare hands as the oils from your fingers can cause the bulb to fail.

References

• "2000 Cadillac Seville STS Owner's Manual"; General Motors Corporation; 1999