Installation of HID lights on Cadillac STS
Installation of HID lights
1998 - 2004 Cadillac Seville
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The HID headlights on this 2001 Cadillac Seville were
installed by customer S.T. of Naples Florida.  This Seville did
not come from the factory with HID lights so S.T. used our
9006 kit with the 4300K OEM / White color HID bulbs.   If your
Seville already has factory installed HID lights, then it will use
HID-D1S size bulbs that you can find on our
HID-D1S bulb
page.

If you have an STS that was upgraded with a kit and you need
replacement kit bulbs, our 9006 size kit bulbs can be found at
the
bottom of our main bulb page. (kit bulbs at bottom)
The first step is to gain access to the headlamps by removing the 6 bolts
that hold the fairing in place.  
Remove the rubber
dust cap to access the
stock bulb. Remove the
stock bulb by twisting to
expose the 3 plastic
prongs and insert the
new HID bulb included
with the kit.  You will
have to press down on
the base of the bulb
(into the headlamp)
before you are able to
turn it and lock it into
place.
Before HID upgrade
Next, there are two bolts to remove in order to gain access to the rear of
the headlamps and find a spot to place your ballasts.
Connect all plugs between the bulbs
and the ballast
. Note that on this Seville
the ballast plug had to be inserted as
shown above (exposing the metal
slip-stub and using the stop-stub).
Tuck the wires in toward the bottom of the headlamp, replace the dustcap, and
plug the vehicles factory harness
(the plug that was attached to the stock bulb)
into the remaining unused plug that connects to the kit bulb.
After HID upgrade (with 4300K color)