Where Is The Factory Installed XM Antenna..??

[Viet Nam Vette]

Since my rig didn't have XM.. I had it installed at the dealer. Just noticed the other day that the XM antenna is stuck on the center of the roof about 3 " or so back from the windshield rubber.

It's about 3" in diameter 1/4'' or so high and has a 3/16" black wire that runs from under the anttena across the roof to and under the rubber molding around the windshield.

Is the factory antenna in the windshield..??

When I get the marker lamps installed I wonder if I can palce it over the antenna to hide that hiddious black acne blemish...

[Mike E]

You should be able to move it no problem. Mine is like a little black antenna that is a magnet and sticks to the roof. Try and keep it on the roof and you will get the best signal.

[whaaaaT]

Hmmmm good question. I have no idea where it is. I know the gps for the navigation is actually one of the little cut out looking things on the dash and the onstar is cellular antenna on the roof. xm antenna could be on the dash to i supose.

[Viet Nam Vette]

Originally Posted by whaaaaT

Hmmmm good question. I have no idea where it is. I know the gps for the navigation is actually one of the little cut out looking things on the dash and the onstar is cellular antenna on the roof. xm antenna could be on the dash to i supose.

Was yours a factory installed unit..??
Take a peek up on top of your rig... and see if you spot it .

[Viet Nam Vette]

Originally Posted by Mike E

You should be able to move it no problem. Mine is like a little black antenna that is a magnet and sticks to the roof. Try and keep it on the roof and you will get the best signal.

Is yours a Round shape about 1/4' or so high?? Maybe mine is magnetic..?? Was yours from the factory...Or dealer installed..??

[n5bxp]

It is built into the Onstar antenna.

[whaaaaT]

yea theres nothing up there it probly is built into the onstar thing.

[marin8703]

Originally Posted by n5bxp

It is built into the Onstar antenna.

the antena over the passenger is a dual antenna, xm and onstar. even if you didnt have xm from factory i think there is still a lead that is just hanging over the glove box area (where the airbag stuff is). you will probably be able to use that instead of adding a new one( i realize its already done, but you can remove your old one). but if it is there (the lead) you might have to midify it a bit, there are litle channels on the receiver plug and thing sticking out of the lead plug which you might have to cut or shave off. i think someone asked the same question somewhere else on this forum a bit ago.

[Viet Nam Vette]

Originally Posted by marin8703

the antena over the passenger is a dual antenna, xm and onstar. even if you didnt have xm from factory i think there is still a lead that is just hanging over the glove box area (where the airbag stuff is). you will probably be able to use that instead of adding a new one( i realize its already done, but you can remove your old one). but if it is there (the lead) you might have to midify it a bit, there are litle channels on the receiver plug and thing sticking out of the lead plug which you might have to cut or shave off. i think someone asked the same question somewhere else on this forum a bit ago.

Well that would be cool if there is a lead their.

Anyone know for sure if I can remove that Acne Blemish and use the the lead from the OnStar /XM feed...??

F5....??

[Viet Nam Vette]

I was having a problem with my puter when I tried to search this topic from the beginning. But it's working now.

I did find some info on this ....there is a XM feed wire off the OnStar antenna.. So now all I have to hope for is that the dealer didn't drill a hole to mount that black disc.

[f5fstop]

Not all of the warts GM uses for antennas have all the leads. If you have the wart with the little dingy antenna on top, most likely there is an XM lead (and the dealer should have known). Possibly there was no lead.

The little wart on the tri-mode antenna contains the XM and the Onstar GPS, and the little antenna sticking up from the wart is the cell antenna for Onstar.