Thread: Cadillac Cts 2004 - Carputer Project

THE PROCESS

The first thing to get the radio out from the car is to pull the air vents and the climate control apart. You can do it with your own hands but it’ll be better if you use some kind of flat trowel. The radio is only fitted to the chassis with 4 bolts and after unscrewing them you must disconnect the ISO connectors plugged at the back side of the unit. Depending on which system you had the connectors panel may change.

The front face is a plastic piece fitted by 4 torx screws and 2 red connectors that interface with the main board inside the radio chassis. Once you disconnect them, you will see 3 different PCBs, one bigger for the DIC panel and 2 side boards for the control knobs. They are fitted with torx screws to a plastic mount as well. When all the parts are pulled apart, you can realize the actual size of the plastic you can cut off to room the screen bezel. Though I wanted to keep the original function keys, the guys I paid to do the job misunderstood me so they cut them off too so I had to change my plans a little. Finally I kept the buttons at the screen bezel so I could change the video source to get the images from the rear camera or turn it off manually.

This is a guide to integrate the screen, but be advised that the chassis from the factory radio is big enough to size it is easier to locate the boards inside. http://www.mechatroniks.com/wrx/lili629.html


Since I couldn’t get a spare radio in the same colour mine was so I had to perform some extra jobs like sanding and painting, so if you intend to do it the way I did do not make the same mistake. It looks great at the end, but it makes you waste a whole week.

I am curious. Why couldnt you use the unused factory cd inputs for audio from the PC? This would be easy to do and you could keep the factory radio in tact for am/fm. All you would have to do is switch the factory radio to CD for the carputer audio to work.

In my case I would rather do that because I have an '05 cts which has XM built in.

Also, There should be enough room to install your cd/dvd rom (barely) in the dash above or below the 7". Were there any other issues you ran into that prevented this? Well one thing I notice is that you wouldnt be able to use the lcd bezel because it is too wide. Good luck on your project. I will probably have a lot more questions once I get started on mine. -r0xxx

What I'm doing is to take the sound from the sound card through 3 minijack to RCA cables. Remember that Epia MOBOs allow you to convert the "mic in" and "audio in" ports to out in order to get 5.1 sound. I'm keeping all the DIC info and the radio tuner as well. I'm only losing the original CD player.
How will you send the sound to the head unit CD input? If you do so, will the navigator voices be available when listening the radio? I don't think so ... but if you have a solution for this I would change my mind.
Have a look to the previous projects above, they were able to use the bezel and I'm doing that as well. The 7" touchscreen sizes the whole front, so there is no space for the DVD/CD slot.
I wouldn't recommend in-dash solutions because you will have problems at the end of the day.

Here you are some useful links for software:

www.free-codecs.com
www.fluxmedia.net
www.eset.com

Some others:
http://www.mini-itx.com/hardware.asp#hardware0047
FAQ: How Do I Get 5.1 Audio From My M10000 Onboard Audio?
http://www.mechatroniks.com/wrx/lili629.html

Sorry I don't have anything constructive to add, but this is definitely the wrong forum for this. Show off is only for completed projects.

And on the English bit, yours is better than many that speak it as a first haha.

Wrong place to post this.

I would imagine that the the audio wires for the CD player can be found in the cable between the radio and the cd player. Since you wont be using that cable, you should be able to hook up your audio out from your pc and splice it to this cable. You would need a wiring diagram of the radio which you can find at cadillacfaq.com.

You are right you would not be able to use audio from the NAV while the radio is playing but I dont see this as a big disadvantage. There is a button on the steering wheel of the CTS that lets you cycle between radio and cd (carpc). I like this option better than cutting the curcuit board of the radio like mattbai did. I would want to talk to him before I start on my project.

You said you bought a spare radio so you can return the dash to factory if need be. That is a great idea and I would like to do the same but a few questions...
Where did you get another radio and how much did you pay?
Does cadillac put any antitheft devices on the radio where they lock up if power is removed? That would suck if you had to call the factory everytime you change the radio.

I am going to try my hardest to find a way to get the dvd player to fit in the dash somehow.

The screen can be fitted using the original clamps at the bezel, and then we must locate the rest of the PCBs. Be sure they will not move using velcro (or any other means).
I connected the power to ACC, using some of the empty fuses at the box under the backseat ( I wouldn't recommend to use the climate control to get power). The Lilliput has USB and VGA connections for the tactile function and the image. In addition we will use the second video input to connect a rear camera, powered by ACC as well.
The camera is quite big (the one I liked by Alpine is € 300 and works even after is submerged in a glass of water). It's 120º angle and IR vision (0 Lux) so it's a good and cheap option). I'm locating it just above the plate and I will protect it with a PC sheet so it cannot be damaged by "accident".

how's it going?

i'd like to see the end result...

The chassis is a 6 walls box that can be easily taken to pieces. The front wall is again fitted by torx screws but the upper and bottom walls are fitted by pressure flanges. Inside the chassis we have the CD player and the radio main board and both must be fully disassembled to have room enough to locate the computer components.
It’s all about screws so I will not explain the process. However the radio antenna is soldered to the chassis so we must unsolder it. If you are not going to use the original radio later you don’t have to solder it again, but I did it because I wanted to.

Since the Epia board is too big for the chassis, we must locate it vertically and that affects the rest of the components. I did it this way:

Hard disk and M2 power supply screwed to the back wall.
Mother board screwed to the side walls and the I/O panel headed to the bottom.
Radio main board screwed to the front wall, inside the chassis. The connector panel is headed to the bottom too.

Be careful to keep the holes clear in order to allow the cables pass through and avoid any kind of contact with the chassis, so use plastic bushings or any other means when screwing the components. The bushings will be useful to cushion the vibrations as well.

CONNECTIONS

The touch screen is connected to the Epia via USB (to act as a mouse and keyboard) and the VGA port. You can get the power from any switched source (I wouldn’t recommend to use the climate) but we used the fuse panel located under the back seats. Since I will not use the audio, I cut the speaker and the RCAs off.

The video in connector is used for the rear camera, so you will be able to switch from the PC to the camera with the front PC/AV button of the screen. I used a 120º angle waterproof camera, it’s good and cheap but huge (3.5 cm diameter) so you can look for a minuscule but expensive Alpine model that works even inside a glass full of water if you can afford it (€ 300).

I recommend you to use one of the back USB connectors to plug the GPS antenna because I found some problems to configure it when I plugged it through the HUB at the glove box. I wanted to locate the antenna inside the central air vents, but it wasn’t able to get signal through the plastic (at least mine), so it’s now over the dash board.

I headed the USB cable for the HUB behind the glove box and I practised some holes to pass the cables for the CD/DVD combo, so everything is hidden from outside. Inside the glove box we have the combo, Bluetooth, WiFi, TV USB, Memory Card reader and some available ports to plug any other device.

I'm using a Parrot 3100 device (inside the ashtray) to manage my phone call. It works great so I will not insist about PhoCo.

The main point of this project is to build a custom harness so we could get the audio from the PC to the factory speakers and keep the radio as well. You will find useful these links to wiring a connectors diagrams for the CTS:
http://www.cadillacfaq.com/faq/answe...ndex.html#tab7
http://www.cadillacfaq.com/faq/answers/radiosc.html

There are a couple of ways to get audio 5.1 from an Epia MOBO, it doesn’t make any sense if you are going to keep the factory amplifier because it only has 2 analog channels.

FAQ: How Do I Get 5.1 Audio From My M10000 Onboard Audio?
http://www.mini-itx.com/hardware/ac3/

The idea is to use 2 parallel relays so you can switch from a source to the other by a button at the central console. Since the signal from the PC is too low, you must use a 2 channels amplifier between the computer and the harness.