Can't find where it is located, or how to replace it.
If I am not mistaken, it is under your car battery. Square box with a big wires connector plug with a 10 mm bolt in the middle or underneath your air cleaner. Good Luck.
It is actually called flashing your Engine Computer. You can find a auto parts store which sell the unit and also flashes them you do not have to go to dealer. Normally it will cost you any where from 80 to 100. But I do not know what is wrong with yours, in many cases they can flash your old one. In other woeds they are rebooting your harddrive. But it called flashing, no depending on what is wrong with your it might not be a good Idea to flash it. I would say it is totally up to you. Now my question why do you think you need a new ECU.
The ecm/ecu/pcm is inside the air filter box. Getting technical, flashing is what they call "programming" a new computer that has nothing on it. It is programmed to your car. They need the VIN#. Upgrading is what it is called when they find a fix for a problem in certain vehicles, this is software. Again programming. One thing I do wonder, like Antonio, is, why do you want to replace it? It could be sensors, wiring, plugs.
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If you are talking about your pcm that is the main power train control module its behjnd your air cleaner housing. but it has to be progrmmed to your vin # to work
Testimonial: "Thank you so much for your help....finally had to just get rid of it, too many problems just one after the other."
SOURCE: 2004 pontiac grand prix serpentine belt replacement/ routing
first look underneath the hood... is it there on a sticker... if not i'll need the size of the motor to let you know
Robert
SOURCE: LOOKING FOR A FUSE BOX DIAGRAM FOR 2004 PONTIAC GRAND PRIX GT
It's under the hood, on the driver's side, under a square, black box with a lightning symbol on it. Loosen the flower-shaped screw that holds the lid of the box down, remove the lid, flip it upside down and when you look at the inside of the lid, you'll see a map of all your car's fuses. There's also a fuse diagram on the very end of the dash, but it's accessible only when you open the driver's side door. When you're driving, that end of the dash is blocked by the closed door.
SOURCE: I need to flush the radiator on my 2004 Pontiac Grand Prix but I
Just take the bottom hose loose and flush away.
SOURCE: my 2004 pontiac grand prix window it will go down
Does it try to come up, EG is there power being applied when you press the UP switch? if it makes no sound or movement when pressing the UP switch it is probably a worn out switch - available at Pontiac dealers though you may have to order it and wait a few days - have your VIN number for the parts desk and you'll get the part in no time - the switch levers out of the panel - use a plastic tool if possible to prize the switch out so you don't damage the surrounding trim - the cable connector clips off the old switch and goes on the new switch, press the switch home into the recess and jiggle it a bit to make it dead flat - window should work now.
If it IS making an effort to come up then either you have a poor earth or power connection making it so there is not enough power to pull the windows up (which is harder than down due to the weight of the window)
-- check the cabling behind the door panel, and as above pull out the switch and check its connector too.
OR... the window is out of alignment and is jamming - putting it back in alignment means taking off the door panel and getting at the bottom of the window runner, loosening the bolt(s) on the bottom of the runner and moving it sideways so it hold the window steady but not tightly, you may have to try having it tighter or looser against the window till you get the best performance - also oil the moving parts/cables of the window mechanism (dont get oil on the glass, it will smear for weeks) to give the best chance of smooth operation.
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