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2000 pontiac grand prix gt interior lamp problem
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GLENNE
New User
Mar 14, 2008, 8:16 AM
Post #1 of 6
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2000 pontiac grand prix gt interior lamp problem
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2000 Pontiac Grand Prix GT, the interior lamp fuse blows. Replace the fuse and it blows in a few hours or days of use. The interior lamps are on a circuit of their own. Making the issue worse, is that I have not been able to locate a schematic for the electrical system.
Any ideas?
GLENNE
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Mar 14, 2008, 9:27 AM
Post #2 of 6
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Re: 2000 pontiac grand prix gt interior lamp problem
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Guess: It might be a problem with the switch that makes it come on when you open the door. Those are at door jams or at the latch inside the door. Fuse would blow even with bulb out I would think if there is a short with the switch - also wires where they bend in the door jam,
T
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DanD
Veteran
/ Moderator
Mar 14, 2008, 10:42 AM
Post #3 of 6
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Re: 2000 pontiac grand prix gt interior lamp problem
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This 10 Amp fuse doesn’t directly power the interior lights; yes it protects the circuit but this fuse’s power wire, feeds the Body Control Module (BCM). From there the BCM controls what lights are allowed to be turned on or off; depending on the request sent to the BCM.
This orange wire from the INT Lamp fuse goes to the BCM connector C1, terminal G.
You’ll also find a dark blue wire in connector C1 terminal E this is the wire that sends power out to all the different light circuits; when the BCM sees fit to turn them on.
The BCM also controls the ground side of portions of this circuit via a gray/black wire, connector C1 terminal F.
The door switches that Tom is talking about in this case cannot be the problem because they are only a ground input signals to the BCM; telling the BCM that a door has been opened.
Don’t become confused or only go by wire colors because the right front and both rear door input switches also have dark blue wires but they go to connector C3 of the BCM and like I said there isn’t power on these wires they are a ground signal.
Now that I’ve got you completely confused; I’ll say that no; it’s not just a simple dome light wiring circuit anymore and you may find yourself pulling out your hair looking for an intermittent short that is blowing this fuse.
The one place where you may get lucky and stumble across the problem is in the trunk. I’ve seen where people have knocked the light assembly or the wiring harness out of their retainers and now are being pinched by something like the trunk lid hinge?
Dan.
Canadian "EH"
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DanD
Veteran
/ Moderator
Mar 15, 2008, 8:11 AM
Post #4 of 6
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Re: 2000 pontiac grand prix gt interior lamp problem
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I thought I would bring this back to the thred here.
Dan D
Thank you for the detailed info. I follow what you are saying. I agree that a wire is shorting out that blows the fuse, finding it will be fun. One thought I had was to remove all but one of the int bulbs and add back the bulbs one by one hoping to find the circuit that is causing the problem. Does this make sense? Other wise, I will have to inspect all areas where a wire can move or have the insulation broken enough to cause the bare wire to contact a ground.
I thought that the BCM could be the problem, possibly a bad relay or ?? You apparently dismissed the BCM. Does the BCM ever fail?
I will start in the trunk area and work toward the doors.
Thanks for the detailed info.
GlennE
Yea it could be the BCM but there’s more potential for a short to ground on the dark blue wire on the power feed to the lighting circuit. The short could be anything from a bared wire to a bulb or LED that has gone to ground.
If the trunk thing doesn’t pan out, you could go to the BCM and clip the dark blue wire at connector C1 terminal E.
Maybe I should explain that the connectors are labeled; so you should be able to see the connector designation C1, 2 and so on stamped or engraved on the connectors and then the terminal designation A,B,C ect along with the wire coloring.
By clipping the wire you will determine whether it (the short) is the BCM or the lighting circuit.
There are splices (branches) in the circuit where the one wire from the BCM is spliced to add different paths feeding all the different lighting in the circuit.
Finding these splices and disconnecting one path at a time might be the way to narrow down where to look.
I’m thinking we should keep this discussion back on the original thread; we may have more luck with everyone’s help, finding the problem?
Let me know if you want to move this to the forum?
Dan
To see all of what is involved with this circuit you’ll need a few different wiring diagrams. I have access to them but I’m worried about copyright issues and I can’t afford a lawsuit if I copy and send you the required diagrams. Sorry
You could go to Mitchell1 and rent some time on their site.
http://www.eautorepair.net/
I know I probably sound like a chicken Sh!t but I just can’t take the chance.
Dan
Help out here guys, wherever you think you can.
Dan
Canadian "EH"
(This post was edited by DanD on Mar 15, 2008, 8:14 AM)
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AC315
New User
Dec 21, 2008, 12:11 PM
Post #5 of 6
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Re: 2000 pontiac grand prix gt interior lamp problem
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I know this is an old thread but I got the same problem with a 2001 Grand Prix GTP. If I put a 10 or 15 amp fuse into the lighting circuit it will blow immediately. But if I put a 20 amp fuse in the lights all come on very dim, just barely lit. The 20 amp fuse will get hot pretty quickly so obviously I do not leave it in even for trouble shooting. My question is, before I go tearing trim off and carpeting out, does this sound like more of a BCM problem?
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DrElectrics
Enthusiast
Dec 21, 2008, 4:06 PM
Post #6 of 6
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Re: 2000 pontiac grand prix gt interior lamp problem
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Guess: I see problems like this all the time. What I am finding in most cases is that the wiring for the interior light is earthing out on the metallic roof of the vehicle.
Solution: Take off the cover of your light, have a look at the prongs that hold the globe in place. if that looks ok, the remove light from ceiling and make sure all wiring is good and that there is an earth somewhere.
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