Pleiads' biggest leghumper
Join Date: Oct 1978
Location: Cashmere, WA 98815
Car Year: 04's
Car Model: 2 FXT's.
You guys are over thinking this way to much, no need for switches, relays or splicing at all!
First question would be what radio are you going to use the most, pioneer or jvc?
Put the radio you are going to use most in double din housing and have it connected to the speakers.
Now you will need to make sure both units have power by using your plug and play harness.
You will need to buy a headphone to headphone or headphone to RCA jack, cut one headphone jack or both RCA jacks off and connect the cut portion to the front outputs of the deck that is in the lower portion of the dash and run the headphone jack up to the radio in the double din housing and plug it in to the aux in on the back of the radio. If your radio has RCA jacks for the aux in portion, then use the RCA jacks you cut off.
Once your finished you will need to make sure the volume on the lower radio is set at zero, select your aux in on the upper radio. Slowly turn th volume up on the lower radio so that it matches the other sources when you go from aux, radio, iPod, and app...
Your welcome and I work cheap, I like Dr Pepper...
04 FXT manual Platinum Silver "Sti swapped"= Mine.
04 FXT auto Sierra Gold = Hers.