I'm guessing that you're referring to the lamps that light up the Pontiac name across
the center of the trunk lid. You access those lamps from the inside of the trunk lid IE: the back of the PONTIAC name.
Mine were pretty stuck in place, so I ended up removing that entire rear light assembly. It
comes out with about 6 screws. That gives you more access to the connectors.
You must first remove the trunk door facia. (This is the part with the "Pontiac" lights in it.) Then you can get to the bulb to replace it.
it seem to be the trunk plastic is broke and I have brought the the part and wont to fix it
It is one big peice that must be removed. If you open the trunk, look on the inside of the lid behind the license plate, and you will find a few nuts that once removed, will allow you to remove the entire rear facia panel that the license plate bolts to and which houses the "PONTIAC" lights.
The trunk light switch on a Pontiac Sun Fire is typically in the latch assembly. This is usually inside the trunk and under the carpet.
To replace the brake light on a 2000 Pontiac Montana open the trunk to reveal the housing units. Find the lights and pull the bulbs out. Replace the units.
One that fits.......
you go to the dealership
in the trunk or under your back seat
If you're asking about the piece that lights up PONTIAC across the trunk lid, it comes off from inside the trunk. There are half a dozen or so, screws. I had to pull mine off to get at those lamps that make the PONTIAC logo light up. Normally, you can get at those lamps, but mine were stuck in there pretty tight.
beside the drivers seat...on the floor
Old age and vibration, I'd guess. All of mine were out too. The PONTIAC on the trunk lid wouldn't light up. I replaced the bulbs and now it does. For what it's worth, it's Way Cool when the PONTIAC does light up!
On my 98 sunfire, the tail lights and marker lights only work if you turn on the headlights. If only the daytime lights are on, the Pontiac on the trunk is illuminated but no other lights at the rear until brakes or turn signals are activated. This is common with a lot of vehicles out there. Daytime running lights are not necessarily the same candle power as the headlights. I can tell a big difference in mine.