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Xm Upgrade Communication Wiring Harness

benzboi344

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benzboi344 New Member

benzboi344

Posted
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About a month ago I purchased a Nearly New 2008 LT2 Tahoe Loaded with everything you could possibly get but it didn't have OnStar nor did it have XM. I ordered The XM upgrade from the dealer to have them install it. Three hours later they called me to pick my vehicle up because they couldn't install it because I didn't have the communication wiring harness. I have The 6 disc changer Factory Head unit that is XM ready. I've been searching this whole forum along with other forums and I have yet to hear anything like this. Why would GM sell an upgrade if you can't upgrade? Please Help

handsomerob Enthusiast

handsomerob

Posted
Posted

Didn't know you could get a vehicle from GM without On Star, but On Star and XM and the stereo are all integrated somehow, but if it requires a harness just get the harness. otherwise just get a stand alone XM reciever or Sirius.

benzboi344 New Member

benzboi344

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Didn't know you could get a vehicle from GM without On Star, but On Star and XM and the stereo are all integrated somehow, but if it requires a harness just get the harness. otherwise just get a stand alone XM reciever or Sirius.
I do not want to get an XM reciever. I want to retain my Factory head unit . I did see somewhere on this site about XM direct. Its supposed to operate like the factory setup but without the factory antenna , because it has its own.
jhbrennan Enthusiast

jhbrennan

Posted
Posted

 

 

About a month ago I purchased a Nearly New 2008 LT2 Tahoe Loaded with everything you could possibly get but it didn't have OnStar nor did it have XM. I ordered The XM upgrade from the dealer to have them install it. Three hours later they called me to pick my vehicle up because they couldn't install it because I didn't have the communication wiring harness. I have The 6 disc changer Factory Head unit that is XM ready. I've been searching this whole forum along with other forums and I have yet to hear anything like this. Why would GM sell an upgrade if you can't upgrade? Please Help
You probably don't need the upgrade unless you have a one-of-a-kind 08 Tahoe LT2 - the specs say that XM and OnStar are standard on the LT2 trim level. Ask your service guys to show you how OnStar and XM work...and then ask them why they were trying to sell you an upgrade when it wasn't needed.
MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted
About a month ago I purchased a Nearly New 2008 LT2 Tahoe Loaded with everything you could possibly get but it didn't have OnStar nor did it have XM. I ordered The XM upgrade from the dealer to have them install it. Three hours later they called me to pick my vehicle up because they couldn't install it because I didn't have the communication wiring harness. I have The 6 disc changer Factory Head unit that is XM ready. I've been searching this whole forum along with other forums and I have yet to hear anything like this. Why would GM sell an upgrade if you can't upgrade? Please Help
You probably don't need the upgrade unless you have a one-of-a-kind 08 Tahoe LT2 - the specs say that XM and OnStar are standard on the LT2 trim level.

 

 

Not necessarily....

You can order "XM Delete" for a $100 credit.

You can also order "On-Star Delete" for a $200 credit.

This is mainly reserved for fleet and rental-car company's.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

If you want you can post your VIN and I can run a build sheet and check the RPO codes.

jhbrennan Enthusiast

jhbrennan

Posted
Posted
About a month ago I purchased a Nearly New 2008 LT2 Tahoe Loaded with everything you could possibly get but it didn't have OnStar nor did it have XM. I ordered The XM upgrade from the dealer to have them install it. Three hours later they called me to pick my vehicle up because they couldn't install it because I didn't have the communication wiring harness. I have The 6 disc changer Factory Head unit that is XM ready. I've been searching this whole forum along with other forums and I have yet to hear anything like this. Why would GM sell an upgrade if you can't upgrade? Please Help
You probably don't need the upgrade unless you have a one-of-a-kind 08 Tahoe LT2 - the specs say that XM and OnStar are standard on the LT2 trim level.

 

 

Not necessarily....

You can order "XM Delete" for a $100 credit.

You can also order "On-Star Delete" for a $200 credit.

This is mainly reserved for fleet and rental-car company's.

 

 

I thought maybe a fleet vehicle - with the delete, would that be why the upgrade can't be done? Also with the delete, does GM leave off the roof antenna - if so, I guess that's the real indicator both are missing. I've rented GM cars from Avis and they had XM - I guess not all are the same.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted
I thought maybe a fleet vehicle - with the delete, would that be why the upgrade can't be done? Also with the delete, does GM leave off the roof antenna - if so, I guess that's the real indicator both are missing. I've rented GM cars from Avis and they had XM - I guess not all are the same.

 

No,You "should" still be able to add XM even with the XM delete option.

I emphasize the word "should".....I've never run into this issue before with a GMT900 truck.

I've sold some XM upgrade kits for the '07 GMT900 trucks,But like you mentioned before it comes standard for '08 (Unless its deleted) so I haven't had anyone thats needed to add it to an '08.

 

And yes,If it has both XM & On-Star delete there will be no antenna.

benzboi344 New Member

benzboi344

Posted
  • Author
Posted
I thought maybe a fleet vehicle - with the delete, would that be why the upgrade can't be done? Also with the delete, does GM leave off the roof antenna - if so, I guess that's the real indicator both are missing. I've rented GM cars from Avis and they had XM - I guess not all are the same.

 

No,You "should" still be able to add XM even with the XM delete option.

I emphasize the word "should".....I've never run into this issue before with a GMT900 truck.

I've sold some XM upgrade kits for the '07 GMT900 trucks,But like you mentioned before it comes standard for '08 (Unless its deleted) so I haven't had anyone thats needed to add it to an '08.

 

And yes,If it has both XM & On-Star delete there will be no antenna.

 

 

Thanks guys , I did run the Vin number and the onstar and Xm was deleted. Turns out this was a fleet vehicle. But it still seems I should still be able to get Xm service with the upgrade. I ordered the kit myself and will do it myself to see whats really going on. If this turns out to be the case then I'll order the direct Xm from XM Fan.com. By the way I do not have the antenna posted on the top of my tahoe.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted
I thought maybe a fleet vehicle - with the delete, would that be why the upgrade can't be done? Also with the delete, does GM leave off the roof antenna - if so, I guess that's the real indicator both are missing. I've rented GM cars from Avis and they had XM - I guess not all are the same.

 

No,You "should" still be able to add XM even with the XM delete option.

I emphasize the word "should".....I've never run into this issue before with a GMT900 truck.

I've sold some XM upgrade kits for the '07 GMT900 trucks,But like you mentioned before it comes standard for '08 (Unless its deleted) so I haven't had anyone thats needed to add it to an '08.

 

And yes,If it has both XM & On-Star delete there will be no antenna.

 

 

Thanks guys , I did run the Vin number and the onstar and Xm was deleted. Turns out this was a fleet vehicle. But it still seems I should still be able to get Xm service with the upgrade. I ordered the kit myself and will do it myself to see whats really going on. If this turns out to be the case then I'll order the direct Xm from XM Fan.com. By the way I do not have the antenna posted on the top of my tahoe.

 

 

Let me know what happens,if your able to add the XM or not.

Like I said,I haven't run into any issues here at the dealership.

benzboi344 New Member

benzboi344

Posted
  • Author
Posted
I thought maybe a fleet vehicle - with the delete, would that be why the upgrade can't be done? Also with the delete, does GM leave off the roof antenna - if so, I guess that's the real indicator both are missing. I've rented GM cars from Avis and they had XM - I guess not all are the same.

 

No,You "should" still be able to add XM even with the XM delete option.

I emphasize the word "should".....I've never run into this issue before with a GMT900 truck.

I've sold some XM upgrade kits for the '07 GMT900 trucks,But like you mentioned before it comes standard for '08 (Unless its deleted) so I haven't had anyone thats needed to add it to an '08.

 

And yes,If it has both XM & On-Star delete there will be no antenna.

 

 

Thanks guys , I did run the Vin number and the onstar and Xm was deleted. Turns out this was a fleet vehicle. But it still seems I should still be able to get Xm service with the upgrade. I ordered the kit myself and will do it myself to see whats really going on. If this turns out to be the case then I'll order the direct Xm from XM Fan.com. By the way I do not have the antenna posted on the top of my tahoe.

 

 

Let me know what happens,if your able to add the XM or not.

Like I said,I haven't run into any issues here at the dealership.

 

 

Hey guys , I finished the installation yesterday arround 2:30 that evening. The job was pretty simple. Turns out , the dealership lied to me about me not having a communication wiring harness. I asked a guy who works at a caddallic and GMC dealer why he thinks the guys at the chevy dealer would tell me this and he said; "GM tells the service departments not to install any customer electronics that is not plug and play only or which requires any cutting, drilling or modification. Since I had no antenna, I had to drill the holes myself. I used a 3/4 STEP DRILL BIT (looks like a cone) for the first hole . Then I measured from center of first hole to the center of the second hole 7/8 in. and then drilled 1/4 in. Be cautious because there is no room for error! I recommend any one who's installing a onstar/xm antenna DONT NOT USE A REGULAR DRILL BIT, because its easy to overdrill the hole and its hard to keep it straight. The hole needs to be perfect in order for the antenna to snap into place. The hardest part of this entire installation was that darn xm receiver bracket. You have to have baby hands to get those small screws in there.
MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

Glad to hear you got it installed & working :lol:

And yes,You definetley want to use a "Unibit" drill bit for the installation of the antenna,I remember this from the ones I installed in a couple GMT800 trucks.

  • 11 months later...
usmcfiredog Enthusiast

usmcfiredog

Posted
Posted

Does anyone know the specs of where to install the XM/OnStar Antenna? I am about to do this upgrade myself and want to know where to drill the holes for the antenna. Any help will be greatly appreciated.

MS3DALE Senior Enthusiast

MS3DALE

Posted
Posted

They should give you a template on where to drill them.

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