Finally installed my XM
Hey , I finally installed my XM. I used the XMFM1 modualator so I avoided the Sureconnect and the cassette adapter. I couldn't get to the antenna wire in back of the radio (due to the Dock-n-Lock design) without taking the dash completely apart. It looks like I probably could have reaced it if I pulled the top of the dash off, but I wasn't willing to go THAT far. As it was I took most of the stack apart and pulled the glove box out and dropped the headliner in the back and along the passenger side.
The way the XMFM modulator works is that it is connected inline with the antenna wire going to the back of the radio. So it had 2 leads, one intended to plug directly into the radio and the other to plug into the original antenna wire that goes to the antenna. When XM is turned on, it isolates the antenna and just feeds XM signal into the radio.
I ended up installing the XMFM modulater at the antenna module above the headliner in the back. There are three antenna wires coming into that module. (one for the front antenna, one for the rear antenna and one going to the back of the radio HU up front) The problem here is that the wire for the front antenna and the one for the HU are similar wires. The difference is that one had a yellow sleeve around the end. The one with the yellow sleeve went to the radio. I was able to remove the module by dropping the headliner a bit and removing the single 10mm bolt. I needed the GM antenna adapters for the XMFM1 unit (to convert from the large (standard) plug to the mini plug that GM uses). The problem I ended up with was that the lead coming off of the XMFM1 modulator to go to the radio was a male lead. When I unplugegd the antenna wire from the antenna module that went to the radio, it was also a male. The same sitation was true for the other side of the XMFM1 modulator that was suppsoed to go to the Antenna and the antenna module plug, they were both female. I had to mod the adapter cable to give me a a Male large end to a male mini plug and another to be a female large connector to a female mini connector. (basically just swapped the ends of the two GM adapters). It was a bit of a hassle with all of the trim pieces (I pulled off both A piller trims, the passenger side B piller and pulled away both C piller trim pieces to route the wires and to get into the headliner) but everything worked out fine, no wires showing. I used some wire taps to pull power from the cigar lighter and hid that under the hush pad on the driver'* side. I used some velcro and mounted the XMFM modulator on the inside of the roof above the rear drivers side hand hold (the "Oh-No" Handle) and courtesy light.
My battery ended up going dead, so it'* on the charger now, (I thought the run down protection would prevent this....) But all in all no major issues and the sound quality is good. It was interesting that I originally had the modulator connected backwards (before I realized that I would need modified adapter cables) and it still worked, it just didn't provide great sound quality.
Sorry for the long post.....