Open the trunk and carefully pull off the trunk lid carpet liner by working at each black push-pin. They will be tight, so confine your pulling to as close to each as possible. Using a deepwell 10mm socket, remove the 11 (?) nut washers on the studs holding the license plate and lamp assembly onto the trunk lid. Carefully remove the entire license plate/lamp assembly. You can remove the sockets and harness if desired.
You will need to replace ALL the bulbs - why go through this again ?? You'll need 4 each #194 (tag/running lights), 4 each #3457, and 2 each 2357.
The OEM bulbs are #3057 and #1157, but the new numbers are slightly brighter. Don't worry about the backup lamp bulbs being dual-filament: the wedge base will always align the correct filaments in the socket.
Now place a dab of flexible duct seal (hardware store) around each stud base. Carefully push the assembly back into place, and using an assistant, check the operation of all circuits. OK ?? replace all the nut washers, snugging them up in a center to outside sequence to spread the loads - don't tighten each one all the way the first time - work around and around 3 times.
If you still have a bulb out or dim bulbs, then check the wire harness where it exits the left trunk hinge rail and also the harness ground at the sheet metal at the left fenderwell.
Read more at http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/194807-2001-sts-reverse-lights-replacement-how.html?kcplink=1Read more at http://www.cadillacforums.com/forums/cadillac-seville-cadillac-eldorado-forum/194807-2001-sts-reverse-lights-replacement-how.html?kcplink=1
The
process for replacing tail light bulbs is the same in all models. If
you have a burnt-out tail light bulb, you may need to replace the
brake light, the reverse light or the turn signal. The procedure to
replace each of the bulbs is the same.
Instructions
1.
Open the Hummer's rear swing gate. This will expose the edge of the
vehicle's tail light assembly. You'll see two small Phillips head
screws that hold the tail light assembly in place. Put on your
gloves.
2.
Remove the two screws from the tail light assembly. Pull the tail
light out and inspect the back for two bulbs. The top bulb is the
brake light and turn signal. The bottom bulb is the reverse bulb.
Determine which bulb you need to replace.
4Push
the replacement bulb into its socket firmly. Insert the socket back
into the tail light. Turn it clockwise to secure it in place.
5Place
the tail light into its cradle. Hold it with one hand and replace
the Phillips head screws with the other.
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