Installed the iSimple ISGM575 into my H3T Alpha Monsoon system (without navigation).
Easy to install.
It works perfectly and sounds good, well at least as good as the stock audio system can sound.
Only tried an iPhone 4S so far.
Select iPod to use your iPod or iPhone with control through head unit
Select Aux1 to use your iPod or iPhone with control through iPhone
Select Aux2 to use the 3.5mm audio jack input
Make sure to read the yellow paper with instructions on first time setup (see pic below) or it will not work.
You have to wait ~3 minutes when you turn key to accessory position and radio is on, then press band until XM comes up on display, then QUICKLY rotate lower tune dial to select iPod (or Aux2 for audio jack), once selected your iPhone goes into device connected state and all control can go through head unit.
With "iPod" selected, you can press display button to see artist and song info.
Pressing 3 on head unit lets you find an artist, album, song and play it.
It's also nice that the connector charges the phone. Did NOT get any error messages on the iPhone when connected. Appears iPhone 4S is fully supported. Also it is nice that the navigation apps now play through the speakers and music gets quiet while giving directions. I have only used it a little, so I will update later on if I encounter any issues. But, so far so good. Met all my expectations. If you plan on keeping the stock head unit for awhile, this is a must have if you want to play any type of audio player through your speakers.
Will probably add a panel mount jact for the 3.5mm audio cable on the dash panel at some point.
Remove dash panel. I just pushed from backside bottom to get a plastic trim ply tool under the bottom to pop out the clamps on left and right side, then slowly worked my way up to the top of the vents.
Be careful not to pull on two connectors at top
View with dash panel removed. Noticed I took home a bit of Moab with me back inside the dash.
Remove connectors at bottom. Take note of location of the two clamps at bottom sides for when you are removing and re-installing the dash panel.
Take note of where the clamps are located. One top center, two on side under vent, two on side of head unit
Remove four 7mm screws on head unit
Three connectors on back of head unit.
Contents of iSimple ISGM575 box.
Read this and follow it to the letter on first use. Comes in the iSimple package. This only has to be done once. Next time you use it, it is easy to select the input you want to use at any time by pressing the Band button.
Connect everything and test it out before installing dash panel.
Cable tied device on left side of head unit, with a cable tie around connectors, one on top and one on bottom.
Select iPod to use your iPhone/iPod. Was cool to see this displayed for the first time.
Select Aux2 for 3.5mm audio jack