wiring bluetoot into old car stereo?

[RockyBalboa]

I am looking to add bluetooth to a older head unit with hopes of it being non visible from the outside of housing. I ordered a universal bluetooth unit that I am going to hard wire into my aux port on headunit. This should work fine but also want to use my cell phone for navigation while lisening to the fm radio , so I assume I need to also tap into the fmradio out put some how. Any one have Ideas on where to start.
wiring bluetooth into aux port only allows me to use bluetooth when head unit is in AUX mode.
I would like the bluetooth navigation , recieve phone calls, while fm radio is in use.

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[dragon.breath 10+ year member]

Simple answer. You can’t. If you want that kind of functionality, you will have to get a new head unit.

 

[Jeffdachef 5,000+ posts]

return that module and buy a new head unit. All you are doing is just creating unsolvable headaches.

 

[Gunk]

New head units with BT are pretty cheap these days if that's all you're looking for.

 

[Popwarhomie 5,000+ posts]

Blaupunkt bluetooth headunit is $20 on Amazon and Walmart.

 

[RockyBalboa]

eh , you guys are no fun. The module works fine. I tapped into the aux input jack. It works the same as if you plug it in from the face, only no wires visible. Works the same , just no visible wires from the face since its hooked up inside. Easy, 3 wire hook up. I didnt get all I wanted by overiding the radio system but I did get wireless blue toot. Running the radio through the fone , the gps and fone calls will still operate as I would like.