Hey!!! I’ve read past threads and learned a lot but I still have a few questions. I have a 03 coupe with stock navi, and like everyone I want to change my HU. I know I need a double din kit (preferably JDM ) and AC controls, but what else is NESSACARY to get the best result? I want the stock nav to continue working but I read that the voice will not operate, no biggie. Now,is the metra kit that bad?? and my speakers arent playing audio! you only hear sound when my navi is active but the sound is very faint and low! does this mean my speakers are shot? or can it simply be a fuse? Sorry for all the questions im a huge noob Thanks in advance

 

1: You need JDM/Metra, HU, Wiring harness (70-7551 for bose 70-7550 for non-bose), pac swi-???? steering wheel adapter to match your headunit brand, scosche generic double din trim ring.

2: For 03s and 04s, I think the metra is a closer match than 05/06's but there's no substitute for OEM when it comes to perfect match. If I offered you $100 to let me make your interior ugly, would you do it? Don't be a cheapskate with something you're going to look at and touch every single time you're in the car.

3: Never really heard of somebody's system playing only nav voice. Definitely check the fuses by the driver's left foot, and in with the battery.

 

ok cool! is there a way to keep the stock navi voice working with a dd hu

 

Yes.

Alpine units which support Alpine's Versatile Link can use the discontinued KCA-410C adapter to have the nav voice interrupt audio.

For other brands, you have to get creative, or go without.
Using a 12v double-pole, double-throw (DPDT) relay, you can use the voice trigger wire from the nav to switch the left-front audio channel from the aftermarket HU's output to the mono audio output from the headunit you'll be able to hear directions through that one speaker.
Just wire up a +12v relay like this:
Relay + = Voice Trigger Wire
Relay - = Ground
Normally Open 1 = Voice Audio Output +
Normally Open 2 = Voice Audio Output -
Normally Closed 1 = Left Front Audio Output from headunit +
Normally Closed 2 = Left Front Audio Output from headunit -
Relay common 1 = Left Front Speaker +
Relay common 2 = Left Front Speaker -

I don't have the wire colors memorized, but you can find them in the service manuals.
And I"m not sure how loud the voice will be if you don't have an aftermarket amp either.

 

lol that was totally a foreign language! Are there any other pieces besides that alpine part that’ll allow the navi voice to continue? And lastly, is the dd conversion basically plug and play? i don’t care for the dual climate controls. Is wire cutting involved?

 

It's not that complicated - buy this relay:

http://www.radioshack.com/product/in...AID=107596643#

And wire it like this, where
Relay + = Voice Trigger Wire
Relay - = Ground
Normally Open 1 = Voice Audio Output +
Normally Open 2 = Voice Audio Output -
Normally Closed 1 = Left Front Audio Output from headunit +
Normally Closed 2 = Left Front Audio Output from headunit -
Relay common 1 = Left Front Speaker +
Relay common 2 = Left Front Speaker -

For like $10 you can keep you nav voice with any headunit.


I haven't seen an add-on for Pioneer or Kenwood that interrupts normal audio to allow for an AUX input.

 

Anyone have any experience with this? I'm really curious to know if the stock navigation is loud enough when this procedure is done... I would like to replace my HU but I want to keep the stock NAV.... And input would be great...

 

I don't think anyone's tried it without an amplifier. If you do a search, you'll come across somebody who put a small powered speaker in the dash and ran the voice to that.

If you have a Bose system or will be installing an aftermarket amp, this should work quite well.

 

ok last question i swear lol!! i have everything i need!! i finally got my headunit, dash kit, antenna adapter, and wire harness! NOW is the pac steering g wheel control necessary? Because im not to interested in cutting and joining wires..........I’m pretty sure I’m not missing anything and im hoping its all plug and play lol wish me luck!

 

It's necessary if you want to have steering wheel controls.

There's a bit of soldering or using wire nuts/crimp connectors, but otherwise, yeah, it's pretty much just disassemble and reassemble.