iPhone as car stereo.
I recently purchased a vehicle that has no stereo installed. The speakers and antenna are there, but no head unit. As far as I know, there is no amplifier, either.
So, I wondered if I couldn't develop a custom wire harness to incorporate my iPhone directly into the speaker system and allow me to charge it and listen to music while I drive.
The car supplies power to a stereo system via 12VDC. There are two circuits on the vehicle's connector that supply 12VDC from the battery and 12VDC from the ignition. To charge my iPhone I will only need one of these, correct? I'm assuming that a charge straight from the battery will be sufficient.
There are 2 12VDC pins in the iphone connector. According to pinouts.ru they are both +12VDC. So I would need to run the 12VDC from the car to these two pins, correct?
Also, the vehicle's connector has one ground circuit. Should I simply tie all of the iphone's ground pins to this single ground?
As far as the audio, the vehicle has no head unit and I'm assuming has no amplifier. Will I need an amplifier?
The vehicle's connector has a separate circuit for each of the four speakers (2 right, 2 left). I'm assuming that I will need to tie both left speakers together and both right speakers together for the iPhone's connector.
Thanks in advance for any help anyone offers. I'm an electronic assembler, but I only have basic knowledge of electronics. I'm pretty confident I can perform the work, I just want to be sure that I won't blow up my iPhone or waste a lot of money doing something that won't work.
A little update on the situation:
"I was afraid that I would need an amp. Ultimately, I just want to tinker and be different. I've also found a couple of other inquiries into doing something similar and thought that I might be able to make these things on the side. There was one guy who wanted an in-dash iPhone dock for his Elise because of space issues.
Also, I really dislike the look of car stereos in general, and I wanted my iPhone to mount into the head unit panel sideways for an ultra-sleek look. Furthermore, it's a theft deterrent. The only thing I want to see when the Iphone isn't in the car is a flat black PVC panel with a iPhone-shaped cutout and a docking connector. It should be as low-profile as possible and be simple.
I'm still pursuing this, I just need to find an amplifier. I'm assuming if I find an amplifier I'll probably have to buy a wire harness that will convert Toyota's connectors (they look a lot like Molex) to ISO connectors for the amp.
As far as charging goes, I've been looking into car battery amplitude ratings to determine if I need to attenuate the 12VDC to protect the phone. I'm also looking into the iPhone's wall-jack plug to find out how apple handles the situation. However, if the amplifier has a 12VDC through-put then I might be able to just go through there and avoid the extra effort. We'll find out.
So far the items and costs are:
iPod/Phone dock connector: $40 (includes "extention board" to make connections easier) iPod/iPhone Dock Connector ordering
Toyota->ISO Harness Adapter: $5-$40 (depending on where I get it)
RCA connectors: $5
Misc power connectors: ???
3/8 PVC sheet, enough to fill the dash and make mounts for the iPhone: $20-40
So far it's looking like $120 just for the stuff I know about. The iPhone connector supplier can build custom cables with connectors if you ask them to. I'm considering doing that to avoid the hassle of soldering to a PCB. It will up the cost, but make installation a breeze. Plus, it would put me one step closer to producing these on a regular basis."
you would have to make the dock connector connect to:
-5v power + and - to charge the iphone (id get one of those car usb things)
-Audio line out
*a relay that is wired to close when the iphone is connected (giving a solid connection to the ignition so you can start the vehicle, you said theft deturent right jk)
to get good sound i would have the audio line out go directly into the amp as if it was coming from a stereo OR have a little preamp that boosts the signal THEN go into the speaker level input of the amp (if applicable)
Sounds like it would be much cheaper - and easier - just to install a car stereo and use an FM transmitter, or get one with a iPod jack.... Oh, and you could then get one of the hundreds of car mounts for your iPhone....
Originally Posted by Wattookee
Plus, then you could use your car stereo as a car stereo too.
have you ordered anything from the ridax company yet? I am looking into making a custom harness as well, but will provide video out to my navigation screen and need some parts that they sell on ridax.. I tried contacting them, but they do not pick up the phone or reply to my emails..
Originally Posted by Wattookee