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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, GM XM Tuner & Wiring Harness Part #s? in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Originally Posted by REDLT4 I seem to remember reading in a thread somewhere, that the dealers could not come up ...
  1. #61
    RippyPartsDept's Avatar
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Quote Originally Posted by REDLT4 View Post
    I seem to remember reading in a thread somewhere, that the dealers could not come up with a separate part # for the xm harness, as in, the body harness was the same xm or no xm. This would seem to point to a plug in the harness somewhere for the xm module. It may just be taped up and not easy to find. I won't be able to confirm this for a while, what little car time I get, I'm using to work on the vette.
    Maybe... it's definitely worth a look-see
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  2. #62
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Hi there Rippy,

    I see that you have helped out a few people and have a lot of knowledge. I have a 2005 STS with Nav and XM. About a month and a half ago I moved into a new house. Because my garage was full I was parking the STS in the driveway. I am in Florida and it has been pretty hot. Over the last month and a half the signal on XM has been going out more and more often. When we get in the car to leave there is no signal. After a while of driving it just comes back on. I am noticing that it is taking longer and longer, if at all, to come back. I checked channel 1 to see if it is an XM issue but no signal there as well. From the research i have done it seems like an antenna or receiver issue. What do you suggest I do to resolve this issue?

    Thanks a lot.

  3. #63
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    Re: GM XM Tuner & Wiring Harness Part #s?

    we've replaced a few xm modules before (rarely replace the antennas - if at all, that i can remember)

    i'd like to see if there's a way to figure out if that's the problem though instead of just swapping the part on the off-chance that it will fix this

    let me talk to some of the techs who might have heard of this kind of thing happening before

    i'll be in touch
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  4. #64
    Kingoftypos is online now Cadillac Owners Master
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    Re: GM XM Tuner & Wiring Harness Part #s?

    I recently swapped my XM radio from factory to aftermarket. I can still use the factory antenna though, so that is a great plus. I had this set up last year too, so it's not like my current problem is because of the swap. But it is a new problem, didn't have this last year. I've noticed if I park my car in the sun, specially the rear of the car facing the sun which is where the XM radio is at. I don't have a signal for a few miles, which is during the time my A/C is cooling down the cabin. I believe it's from the connection, so I'll have to take the rear deck apart to reset the connection again. So it's a possibility that the plug from the antenna is getting hot and expanding which causes it to lose connection until it cools down.

    KOT

  5. #65
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    Re: GM XM Tuner & Wiring Harness Part #s?

    that would make some sense....

    i just talked to one of my master techs and he initially said 'sounds like an antenna problem'

    and when i pressed him for more details he said that the basic troubleshooting steps are:
    1. use a known good test antenna and see if that fixes the problem
    2. if that doesn't fix the problem then replace the module
    But KOT's expansion theory sounds like a good one to me also
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  6. #66
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Thanks Rippy. I look forward to hearing from you.

    King, Let me know what you find out. It is so weird, I have really had no issues with my XM for a couple of years but the car has always been garage parked. Now that it has been parked outside, and it's been 90+ degrees every day, it started happening. If you do find that the problem is fixed by 'resetting' the connection please let me know and please explain exactly what it means to 'reset' the connection. Thanks.

  7. #67
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    Re: GM XM Tuner & Wiring Harness Part #s?

    So, two questions...

    Where do I get my hands on a test antenna?

    If it is he expansion issue, where do I go from there?

    Thanks.

  8. #68
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Rippy, do you have one of those diagrams that shows the unit etc for my 2005 STS? I did look in my trunk under the back panel and there were three modules. One looked like it could possibly be the XM module. It had three harness connections and an antenna in. There are no markings or indications that it would be the XM module so I wanted to see if you had the diagram to make sure.

    Thanks.

  9. #69
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    Re: GM XM Tuner & Wiring Harness Part #s?



    It should be on top of the rear deck (under the trim panel of course) to the passengers side of the speaker

    there should be an XM logo on one of the side that has the couple stickers on it

    ---

    i'm not really sure about what to do for a test antenna or what to do if it's a heat/expansion issue

    i think you might have to take off the side trim panels (c-pillars or sometimes called sail panels) to get the 'package shelf' trim off
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  10. #70
    roro0619 is offline Cadillac Owners Member
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Thanks. I'll see if I can take a look and see if I find anything. I'll let you know what I come up with.

  11. #71
    Kingoftypos is online now Cadillac Owners Master
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Im pretty sure that it's heat an expaintion. It has only happened twice for me, and both times I parked my ass end towards the sun for those times. There were days that it was "hotter" but I parked my nose end towards the sun and there were no ill effects on the XM radio signal.

    There are two connections from the antenna to the XM radio module. One is about 6 to 12 inches away from the antenna and the other is on the XM module itself. I have no idea how to remove either the rear deck or the roof of your car. Your gonna have to check with the STS forum for that, check the stickies first if there are any. But what I did was to just unplug them and plug them back in a few times. Then put everything back.

    KOT

  12. #72
    RippyPartsDept's Avatar
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Maybe some dielectric grease in there when you plug them back together to help the signal across any gap that may occur due to heat/expansion?
    Kingoftypos and Kingoftypos like this.
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  13. #73
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Okay guys. I'm going to take a look and see. I'll let you know how it all works out.

  14. #74
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Okay. So I dismantled the entire rear area of my STS. I was able to locate the receiver and the antenna cables leading to the shark fin up top. I totally took apart the shark fin and cleaned it and returned it to its original position. I sprayed some electrical contact cleaner between the antenna connections and at that point nothing. Then I just happened to push up on the headliner and all of a sudden there was signal. I spoke to a contact that I have at Delphi who suggested that it was a short in the antenna wire and I believe he might be right. I have somehow been able to get the placement right and have had signal for more than one half hour! I believe that if I experience this again that I will replace the connection cable between the shark fin and the receiver.

    Now this all leads to a new question. How can I get the tension on the middle seat belt in the rear to release? I can seem to pull any more belt out of the tensioner.

    Thanks for all of your help.

  15. #75
    Kingoftypos is online now Cadillac Owners Master
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    Re: GM XM Tuner & Wiring Harness Part #s?

    Well that's great that you have found the problem. As for the belt, just check to see if anything got inside that might be restricting it from taking the belt back in.

    Just to make sure, you might have a problem in the wire from the antenna fin's wire to the receiver's connection? And what do you mean by taking apart the antenna fin? Because I just bought a new one for my car. And the instructions says not to take it apart due to weather proofing. So if you did that, I would take it apart and put some silicon in it to seal it back up.

    KOT

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