I have an Alpine CDA-9855 and I just bought a SIR-ALP1. I hooked it up, but the head unit won't recognize the Sirius tuner. I have had this same problem with an XM tuner made for Alpine head units. I am thinking that it is the head unit. The SIR-ALP1 has some lights on the inside of it, and they probably indicate what the problem is-if I knew what the patterns meant.
I also had this problem. I had to go through the menu into the setup and then into tuner settings. There should be an option called tuner area. If you set it to area 1 it should start working. For some reason the sirius only works on area one. Hope that solces your problem
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I am in the same situation. I have had my sir-alp1 for 4 years and it simply stopped being recognized. I called Alpine and they said they have no connection to this piece, it is made by "directed electronics" and I need to contact them. A new one is around $120 whereas this one was 79 on sale in 2004. I still have he installation guide/owner's manual for it and nowhere inside is there a number to call them.
There is an option in the unit itself to turn off the internal amplifier. If you push the 'menu' button, then go to the setup/settings menu, and then i believe it was under the 'general settings' tab. there's a option called INT IC or something. Make sure that is turned on.
the only thing left is the head unit but that is not very likely. Go back to where you bought it from and have them give you new tuner box and anttenna. Sorry man But i put these in all day and its almost impossible for the head unit to be the prob