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02 Seville, 04 SRX
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Discussion Starter #1 (Edited)
I just did an install of the SIR-GM1 unit that interfaces with the stock XM ready radios in the 2001+ GM models. The harnesses that come with the unit only works if you had XM installed from the factory so you will need to make some modifications if you didn't have XM.

I did this install on the non-Bose unit. I'm sure you can do it on the Bose or the Nav system, but I do not know the pin configurations.

SIR-GM1 Pin configuration


Seville CD Changer Pin Configuration (we connect through here)


When connecting the SIR-GM1 unit to the car, you just have to match the pins. Because the SIR-GM1 does not come with a useful harness, you need to make your own. Take the supplied harness (the one used to connect to XM installs) and cut all the cables away from the plastic connector on the other end. Use a soldering iron to add some connectors to the ends of each wire (use some shrink wrap on each one to keep the wires from making accidental contact) It will be a lot cleaner if you use shrink wrap on the wire group but this isn't necessary.

My Harness (I thought that I could install the SIR-GM1 behind the glovebox so I made a longer harness. It turns out there there isn't any room so you won't need to make it longer. Your harness will only be about 7 - 8 inches)



Now lets connect it to the car. The connection point is in the center console between the front seats. If you have a CD changer you can still do it but I don't know how you would need to alter the connections.

The two bucket trays in the center console lift out and just below them, there is a little secret compartment that lifts out as well.



Once everything is out, you need to remove the little trap door that is located down there so that the unit can sit flush on the bottom of the console. I used some thick double sided tape to get it to stay put.

Bend the tabs (used for screws) on the SIR-GM1 unit up. Now it will fit in the console.



Once you have it where you want, connect the pins. I couldn't find the part number for the plastic piece that connects to the car so make sure you use terminals that will fit each wire in securely.



After you have confirmed that each is in the correct position and secure, connect the antenna and confirm that the unit does work. Pressing the band button will get you to SIR1. You should get some kind of a message on the head unit that tells you to call and activate your radio. The message will be visual (may need to press the PTY button) as well as audible.

If the radio works, use electrical tape to secure the wires into the harness. If someone knows how to get the correct connector please let me know. But if you are smart with the tape, it will hold up just fine.

The antenna installs just as it says in the installation paperwork that comes with the SIR-GM1 (the Sirius website has a better explanation on how to run the antenna) . Run it from the roof and down the back window (rear left of the car). I found that there was a wire group in the rear left that came out beneath the rear left passenger seat. The seat easily lifts out of the car so that you can route the wire to the center console. Just make sure that when you remove the seat that you are careful to disconnect the connection for the heated seats (its under the right rear passenger seat).

I hope this helps! And again, if anyone knows how to get the female connector piece please let me know. One other thing, I routed my wire under the molding near the door then up under the drivers seat. I think it may be easier to go right up the middle under the carpet but I didn't want to pull it up. You may be able to pull the carpet up and go that way, but I'm not sure if the adhesive in the carpet will re-stick.
 

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Cadillac 2002 Seville STS
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The connector is an AC DELCO PT108. I don't know which side that is as they didn't have it in stock and it was 60 bucks to order. I may have a suppler that may have it in stock, hopefully for a lot less. Once I confirm I'll let you know.
 

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Cadillac 2002 Seville STS
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Have not been able to source plug yet for less than 40 bucks. Also not sure if I can get the right side. Hard to believe how hard they make it to buy a plug.
 

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02 Seville, 04 SRX
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Discussion Starter #4
I'm finding the same thing. I guess its not really a big deal, the hardwire works for me. Its not like I am going to move it in and out of the car. I do suppose I would rather have that professional appearance that the connector will provide... not big deal though.
 

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2002 Seville SLS
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I am new to this site and own a 2002 Seville SLS. I would like to thank you for passing along this information. I bought the SIR GM1 and it was a super easy install thanks to you! Have a great New Year!!!
 

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2003 DHS, 2000 STS
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120 Posts

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2003 DHS, 2000 STS
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120 Posts
I just received the adapter. This fits the factory CD Changer harness. This is what you would be looking for. It is easy to re-pin with a paperclip in hand as well, so that it will match the car's wiring harness.

If you are unable to find the adapter anywhere, if you look for a GM harness adapter. Not sure what the numbers are, but it's the one that will take the 3 factory plugs. That is the same harness
 

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2005 SRX
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This install with pictures is so awesome. Great work Yaemish!!!

If anyone has any way to wire that SIR-GM1 for an '05 SRX (without NAV. And that is key because the HU with NAV is different...), that would be great. I pulled the rear quarter panel and found a connector that was taped up (I don't have XM...) that I thought might have the colors that I could splice to match what I've seen goes into the diagram Yaemish provided, but all the wires going into the connector are PURPLE. Anyone know what this is???

I have't pulled the Bose Subwoofer yet. I've read that the XM receiver is down under there so maybe there's another connector down there.

If anyone has any info on wiring this thing to an 05 SRX w/out Nav your info would be GREATLY appreciated! If I ever get it figured out I'll post it here. TIA
 
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