Question: Where can I find a 2003 Pontiac Grand Am radio wiring diagram? What are the 2003 Pontiac Grand Am radio wiring harness colors?
If you’re looking to change the radio in your 2003 Pontiac Grand Am or troubleshoot why your car radio stopped working, we’re here to help!
Our comprehensive 2003 Pontiac Grand Am radio wiring diagram shows you all the radio wire harness colors, car speaker wiring colors and car speaker sizes. Use our 2003 Pontiac Grand Am stereo wiring guide to help you with your car radio and installation needs.
In This Guide
2003 Pontiac Grand Am Radio Wiring Diagram
This 2003 Pontiac Grand Am radio wiring chart shows you all the 2003 Pontiac Grand Am radio wire colors and their functions. Utilize this guide to help you with a car radio install or help with a car radio troubleshoot. If you don’t see the car radio wiring information you’re looking for, please feel free to ask your question at the bottom of this page.
| Application | Radio Wire Color |
|---|---|
| Car Radio Battery Wire (Constant 12v+) | Orange |
| Car Radio Accessory Wire (Switched 12v+) | The radio harness does not provide a switched power source. Run a wire to the fuse box for switched power. |
| Car Radio Ground Wire | Black/White |
 Use a Car Radio Wiring Harness and Car Radio Dash Kit for an Easy Install! |
|
| Car Radio Illumination Wire | Gray |
| Car Stereo Dimmer Wire | Brown |
| Car Radio Antenna Trigger Wire | N/A |
| Car Radio Amp Trigger Wire | Pink |
| Car Radio Amplifier Location | Car amplifier is mounted behind the trim on the left side of the trunk. |
| Use an Amp Integration Harness to Connect Your Factory Amplifier to an aftermarket radio. |
|
2003 Pontiac Grand Am Speaker Wiring Guide
This 2003 Pontiac Grand Am speaker wiring chart shows you every speaker wire color and the speaker wire polarity. Use this 2003 Pontiac Grand Am speaker wiring guide to help you with a speaker replacement or speaker upgrade. If the car speaker wiring information you’re searching for is not listed, please don’t hesitate to ask for it at the bottom of this page.
| Application | Speaker Wire Color |
|---|---|
| Front Left Speaker Positive Wire (+) | Tan |
| Front Left Speaker Negative Wire (-) | Gray |
| Front Right Speaker Positive Wire (+) | Light Green |
| Front Right Speaker Negative Wire (-) | Dark Green |
| Use a Speaker Wire Harness for easy Speaker Installation! |
|
| Rear Left Speaker Positive Wire (+) | Brown |
| Rear Left Speaker Negative Wire (-) | Yellow |
| Rear Right Speaker Positive Wire (+) | Dark Blue |
| Rear Right Speaker Negative Wire (-) | Light Blue |
| Use a Steering Wheel Control Adapter to Keep Your Steering Wheel Controls. |
|
2003 Pontiac Grand Am Speaker Sizes and Location
This 2003 Pontiac Grand Am speaker size chart shows your speaker measurements and speaker locations. Use this chart to see what speaker fits in your 2003 Pontiac Grand Am.
| Application | Speaker Size and Location |
|---|---|
| Front Center Speaker Size | N/A |
| Front Center Speaker Depth | N/A |
| Front Center Speaker Location | N/A |
| Upgrade your Center Speakers for awesome sound! |
|
| Front Tweeter Size | N/A |
| Front Tweeter Depth | N/A |
| Front Tweeter Location | N/A |
| Upgrade your Tweeters for cleaner audio highs! |
|
| Front Speaker Size | 4″ Speakers |
| Front Speaker Depth | N/A |
| Front Speaker Location | Front Doors |
| Use a Speaker Wire Harness for easy Speaker Installation! |
|
| Rear Tweeter Size | N/A |
| Rear Tweeter Depth | N/A |
| Rear Tweeter Location | N/A |
| Use a Speaker Wire Harness for easy Speaker Installation! |
|
| Rear Speaker Size (Coupe) | 6 1/2″ Speakers |
| Rear Speaker Depth (Coupe) | N/A |
| Rear Speaker Location (Coupe) | Rear Deck |
| Rear Speaker Size (Sedan) | 6 1/2″ Speakers |
| Rear Speaker Depth (Sedan) | N/A |
| Rear Speaker Location (Sedan) | Rear Deck |
| Upgrade your Subwoofer for deeper lows! |
|
| Car Subwoofer Speaker Size | N/A |
| Car Subwoofer Speaker Depth | N/A |
| Car Subwoofer Speaker Location | N/A |
Questions and Answers
If you have any questions about your 2003 Pontiac Grand Am radio installation, please don’t hesitate to post them at the bottom of this page. We’re committed to finding the answers you need, and members of the Modified Life community may also provide valuable insights into the car stereo information you’re looking for. Don’t hesitate to ask your car audio question; it could benefit others seeking the same answers!
Contribute
Do you want to contribute 2003 Pontiac Grand Am stereo wire diagram information to benefit the Modified Life community? Feel free to share your insights by posting at the bottom of this page. We will gather any additional information presented below by our community, verify it, and incorporate it into the car radio wiring guide above for easy reference. We are consistently adding new information to improve and update this car stereo wiring guide as it becomes available. We appreciate your contribution in advance!
49 thoughts on “2003 Pontiac Grand Am Stereo Wiring Guide”
2003 Grand Am. Replacing radio with Pioneer DEH-2400UB. Bought wiring adapter for ease of installation. Matched install instructions without success. As for the wire leading to the amp, there is no wire specifically noted to connect. Anyone with advice?
Austin, first double check ALL your fuses and make sure ALL your fuses are good. You can do this by using an Automotive Fuse Tester and making sure all of your fuses are not blown. You may have additional fuse boxes by the driver side of the dash, passenger side of the dash, driver kick panel, passenger kick panel, under the steering column or under the hood. If all of your fuses are good, we suggest you take your car to an experienced audio installer and have them troubleshoot your problem. Hope this helps. Good luck with your 2003 Pontiac Grand Am radio troubleshooting.
My friend was helping me install an after market radio and didn’t disconnect the neg of the battery. There was a quick pop because the wires were exposed. now i dont seem to be getting any power to the orange wire. I have a 2003 pontiac grand am. I checked the fuse block that is under t he hood and the fuse is good. What else should i check? is there a secondary in fuse?
Reese, technically you could connect your 2003 Pontiac Grand Am amplifier turn on wire to the radio switched 12v+ wire. That way your amplifier is on whenever your 2003 Pontiac Grand Am is on and off whenever your 2003 Pontiac Grand Am is off. If you need a switched power source, run a wire to your steering column and use the brown wire in the ignition switch harness. Just make sure to run an in-line fuse holder with a 1-amp fuse on the amplifier turn on wire. Hope this helps. Good luck with your 2003 Pontiac Grand Am amplifier installation.
What wire do i connect to the remote wire in my 2003 Pontiac Grand Am?
Roger, technically you could connect your 2003 Pontiac Grand Am amplifier turn on wire to the radio switched 12v+ wire. That way your amplifier is on whenever your 2003 Pontiac Grand Am is on and off whenever your 2003 Pontiac Grand Am is off. Just make sure to run an in-line fuse holder with a 1-amp fuse on the amplifier turn on wire. Hope this helps. Good luck with your 2003 Pontiac Grand Am amplifier install.
I installed an after market stereo in my 2003 grand am there is no amp trigger wire on the stereo where do I hook the pink wire too?
Ethan, you need an replacement factory radio wire harness. Here is the adapter you need:
2003 Pontiac Grand Am Factory Radio Wire Harness
Hope this helps. Good luck with your 2003 Pontiac Grand Am stereo installation.
I have an 03 grand am with the monsoon system in it, and there’s 18 wires on the original plug, in which me and a friend had cut out thinking we could just hard wire it in there. I want to put the original harness back into the car, but can’t tell the difference on some of the wires due to the fact that some of them are the same color, or close to it. How can I tell the difference between them so that I can hook them back up?
Jack, first double check ALL your fuses and make sure ALL your fuses are good. You can do this by using an Automotive Fuse Tester and making sure all of your fuses are not blown. If all of your fuses are good, your 2003 Pontiac Grand Am stereo or factory amplifier (if equipped) may be faulty. We suggest you take your car to an experienced audio installer and have them troubleshoot your problem. Hope this helps. Good luck with your 2003 Pontiac Grand Am radio troubleshooting.
How do I get to the fuse box to run the wire for switched power?
Ive just installed to new 6×9 speakers in the back cuz i thought the other two were blowen since the only sound they would make would be a very faint muffles sound . After installing the new 6×9 its still making the same sound . You can hear music but it very low and only treble . Is the a connectiong off somewhere else ??? Im starting to think maybe the other speakers were still working and that something else is wrong
JC, run a primary wire to the steering column and use the brown wire in the ignition switch harness for your 2003 Pontiac Grand Am accessory wire power source. Hope this helps. Good luck with your 2003 Pontiac Grand Am stereo installation.
My son and I are installing a after market radio. I see here that the accessory wire will need to b e wired to a switched source. Can someone tell me at the interior fuse box or other fuse box would be the best place to wire to? It says 12 volt but the fuses all have amps. I wrapped a wire around the wiper fuse and got the radio to work. Is this the best source of power? I just don’t want to blow anything up. Thank for checking this post out. “Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source.”
Just curious.. Can the stock radio from a 2003 Grand AM SE, be put into another GM car without the stock amp? Here is my situation.. I have a 2000 Oldsmobile Intruige that I had a really nice aftermarket radio professionally installed about 3 years ago. But now we are getting rid of the Intruige I liked the radio that came in it, stock and thought it would work better in my Grand AM.. as we are going to have the aftermarket installed in the new car. So I committed the cardinal sin and cut the wiring harnesses out of both cars.. I used your site to copy the wiring diagrams of the two radios and crossed referenced all the wires I could..
In the Grand AM.. I was able to get the Oldsmobile radio up and running.. (lighting took a bit because the diagrams don’t have a separate illumination wire listed in the Olds.. But she is up and rocking.. (like others. I don’t have the security chime anymore.. but that is kewl…
My problem is in the Olds.. I tried to wire the stock Grand Am radio into the Olds.. I get power to the unit.. although there is no lights or sound or clock.. but you can hear the cd motor spin when you hit the eject button.. The speaker wires are the same colors.. My problem is there are a pair of purple wires in the Grand Am wiring harness that I don’t know what they are.. like wise in the Olds wiring there are a set of (green/white.. brown/white.. and black/white wires taped together that aren’t explained in it’s wiring harness.. ) The black/white is a separate wire from the ground.. it’s another..
So now that I have written a book.. can any of you guru’s with some spare time and looking for a challenge look at the two car specs.. and maybe give me a idea of how to do this?? Do I need to take the amp out of the Grand Am or is there away around this?? Plus anyone that has a diagram with the complete wire setup would be greatfully appreciated.. Both the 2003 Grand AM and the 2000 Olds Intruige have wires in their harnesses that aren’t listed in the diagrams here..
Thanks a bunch guys!! You guys really rock here!!
James, you need an 2003 Pontiac Grand Am antenna harness adapter. Here is the adapter you need:
2003 Pontiac Grand Am Antenna Harness Adapter
Hope this helps. Good luck with your 2005 Pontiac Grand Am stereo installation.
where do i plug in the antenna if the old head is not the same to fit my new radio?
Zack, technically you could connect your 2003 Pontiac Grand Am amplifier turn on wire to the brown wire in the ignition switch harness. That way your amplifier is on whenever your 2003 Pontiac Grand Am is on and off whenever your 2003 Pontiac Grand Am is off. Just make sure to run an in-line fuse holder with a 1-amp fuse on the amplifier turn on wire. Hope this helps. Good luck with your 2003 Pontiac Grand Am amplifier install.
I am about to install a sub woofer to my 03 grand am with monsoon stereo and i was wondering where i am supposed to connect the remote wire?
Dan, run a primary wire to your steering wheel column and use the brown wire in the ignition switch harness. Hope this helps. Good luck with your 2003 Pontiac Grand Am stereo installation.
hey im trying to install a aftermarket deck and for this deck to operate, the ignition wire must be connected to something, but in 03 grand ams there is no ignition wire to connect it to. I read earlier that i would have to run a wire to the fuse box to get switched power, where in the fuse box do i connect it?
My wife and I just purchased a 2003 Pontiac Grand am GT with the monsoon stereo system. In order for me to take out the factory radio and replace it with an after market is there anything special i need to do? For example will i need to bypass and amp pr anything like that? Is there an alarm or anything I need to deal with? stuff like that.
Greg, below find a photo of an automotive antenna wire plug:
If the plug in your 2003 Pontiac Grand Am looks something like the picture above then you are correct that your antenna wire is unplugged. If you remove your car radio and look at the rear, you will see a spot where your antenna wire should be plugged in. Hope this helps. Good luck with your antenna install.
this is slightly off topic i bought my grand am used and i have terrible radio reception. looking down at the passenger side floor board i see a black wire that looks like it should plug into something. when i grab the wire the radio reception improves. i was told that this was the antenna wire but cannot find where it would plug in. any ideas?
Freddy, the reason the person who deals in radio hook ups said you shouldn’t have cut the factory harness is because he was probably going to use a stereo wire harness adapter. It is still possible to wire an aftermarket radio. We advise you to take your 2003 Pontiac Grand Am to a reputable audio installation shop. Any reputable stereo installation shop should know how to hard wire an aftermarket stereo. If they don’t know how, we suggest you find a better shop. Hope this helps. Good luck with your 2003 Pontiac Grand Am stereo installation.
i just recently bought a 2003 grand am. My friend and i tried putting in an after market stereo…but my friend cut the factory wires and now my interior lights don’t work…so i took it to a person who deals in radio hook ups and he told me that i should have never cut the wires, that i should have just bought the connectors or car stereo wiring harness. did my friend make a mistake by cutting off the part that goes into the factory stereo or can i still connect an after market radio?
Hey I’m wondering if you have to have one of those Modules for a 03 grand am SE when installing an aftermarket radio ?
I have the same question as Jeff had earlier and I am going to add something else. On a 2003 Grand am why is there 4 wires to each rear speaker and if you put aftermarket speakers in do you need to hook up all four wires to the aftermarket speakers and if so how do you hook them up.
Jose, thanks for the 2003 Pontiac Grand Am amplifier turn-on wire information contribution!
Sean (Buzz, ModifiedLife and Ben also)
ModifiedLife is correct in that if your head is working but no sound you need to to send a signal to the speaker amp. Pink however is not the color, I`ve tried with blue, but doesnt works either. The line that goes to the amp from the factory plug is DARK GREEN (not blue) its to the right from gray.
Joey, as much as we would like to help you, there would be no way to know what you removed or which wires were spliced so we don’t want to steer you in the wrong direction. We suggest you take your car to an experienced audio installer and have them clean up any problematic wiring. Hope this helps. Good luck.
Hi, i had an Alpine cd player with subs, and a 600W pioneer amp in it, I recently took all of it out and put in my stock stereo so i can sell it, But now i get no power to my stock Monsoon cd player/cassette player, and there is a constant clicking noise and smoke coming from my steering column :( I can’t sell it like this. Any one got any suggestions? By the way it is a 2005 Grand Am SE 4 dr 3.4L.
Cliff, most late model vehicles do not have rca outputs on the factory radio to feed an audio signal to your aftermarket amplifier. You would have to install a line out converter to supply an audio output. Here is the Line-Out Converter you need:
Scosche 2-Channel Speaker to RCA Line Out Converter
When splicing in the RCA Line Out Converter, tap your factory rear speaker wires to get a full range audio source. We suggest you invest in some solid wire taps that wont come loose. These wire tap connectors will allow you to tap into wires without cutting and installs in seconds by hand with no crimping or tools required. You must run the power to the battery. If you’ve never installed car audio before, we advise you to take your car to an experienced mobile audio installer. Hope this helps. Good luck.
My son and I are going to try and install a subwoofer/amp combo to his 2003 Pontiac Grand AM that has teh Monsoon Radio. I was wondering if there are RCA jacks in the back of the in-dash stereo that can connect the sub-woofer to or should I just splice them into the speakers into the trunk? Also, is there an easy way to get switched power near the trunk or do I need to run the power all the way to the battery? Thanks!
Installing new rear deck speakers to 03 Pontiac Grand Am GT. Why does it have 4 speaker wires going to 1 speaker(hot and ground on both sides of speaker)?
Sean, thanks for the 2003 Pontiac Grand Am stereo wiring information contribution!
Sean (Buzz and ModifiedLife also)
ModifiedLife is correct in that if your head is working but no sound you need to to send a signal to the speaker amp. Pink however is not the color. The line that goes to the amp from the factory plug is blue no stripe (not blue white stripe). This is nice because remote lines to turn on amps are blue also. i do not know what pink is but it does not power the amp. ModifiedLife is also correct about the accessory line to turn the head on when the car is on (not the power line to power when the car is off) this 12v line is black and on pin over from the also black ground. these black wires are in the opposite corner of the yellow power.
Simple question:
What is the size of a stock stereo in the ’03 grand am? Is it a “dual din” or 2.5?
Juan, you can either take your radio to a authorized repair facility or replace the 2003 Pontiac Grand Am factory stereo with an aftermarket radio. Hope this helps. Good luck with your radio replacement.
how do you fix a stereo that went blank and you cant turn up the volume?
i bought an aftermarket indasdh dvd player. I also purchased a wiring harness so not to cut the car’s wire. does the car have a power antenna? the harness attached to the cars wire doesn’t have one.
Buzz, the pink trigger wire is used to turn on your factory amplifier. You should connect it to the amp trigger wire on your aftermarket radio. Hope this helps. Good luck.
What should the pink trigger wire get hooked up to? Accesory 12V ??
Marcelo, you may have mixed up the battery constant and accessory switched wires. The battery constant always sends power to the radio to save your radio stations and other audio settings. The accessory switched wire sends power to your radio only when the key is in the ignition and your car is on. Check your wiring and make sure the correct radio wires are hooked up to the correct wires on your factory harness. Hope this helps. Good luck.
i recently installed a after market radio , and every time i turn on the car , all the radio presets,and clock resets itself
Hova, it sounds like your radio lighting is faulty and needs replacement. Our advice would be to have your local Pontiac dealer check out your radio or have an authorized audio repair center take a look. Hope this helps. Good luck.
The light for time and radio station is very dim, and goes out at times. How can I fix it? Should I just buy a new one?
Sean, did you hook up for the amplifier turn on wire? The 2003 Pontiac Grand Am has a factory amplifier that needs to be turned on to get sound. Hope this helps. Good luck.
okay im installing a new cd player into my grand am
these are the wires i have installed.
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue
i’ve also got my Orange wire, (my power wire) and my ground wire hooked up.
but… im NOT getting any audio what so ever.
why is this happening?