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2003 cadillac cts
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hello how is everyone doing,im finally back after 3 years,this was a good & fun custom to do!!!,too bad i sold my car weeks after i did it :(
here is a picture 7ec30c32-e6c8-4804-8aef-d2f8f3077f67_zpscbaa6e13.png
 

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2003 cadillac cts
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9 Posts
i did it my self,,without knowing nothing about it,i had no clue about what i was gonna do,,but did a a research and started reading,once i had all the info,i did it,it was easy,just make sure u have the tools a dremmel is one of them..
 

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2004 V (B&M, muffler delete), 2003 Corvette
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83 Posts
Discussion Starter #63
Well, I finally got around to finishing. I went a little different way, I kept the radio functional and fed it into the new head (Pioneer AVIC-Z130BT) as a line-level audio input. This way the stock radio works, and all the buttons work like the station presets. I didn't like the idea of a bunch of dead buttons, that would bug me. The Pioneer front line output goes to the stock Bose, so the stock head unit volume control & audio settings are fully functional. Have some pics!

DIC1.jpg

DIC2.jpg

DIC3.jpg

I also tracked down where to get Retained Accessory Power (RAP) for the switched +12, so the new head and the radio both stay on until a door is opened. It bugged me to have to turn off with the key while the radio stayed on.

Passenger side fusebox, in front of the rear seat, the relay closest to the door is RAP power:

DIC4.jpg

dic5.jpg

The front pin closest to the door is switched RAP power. I was just taking a signal level, so I got lazy and just stuck a wire into the socket and put the relay back:

DIC6.jpg

That's pin 87, the wiring diagram is right on the relay:

DIC8.jpg

That's it! I'm happy, it does just what I want. I did have to add a GPS antenna and a mic; I think I could tap off the mirror mic sometime and get rid of that.
 

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2005 CTS-V
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20 Posts
I also tracked down where to get Retained Accessory Power (RAP) for the switched +12, so the new head and the radio both stay on until a door is opened. It bugged me to have to turn off with the key while the radio stayed on.

Passenger side fusebox, in front of the rear seat, the relay closest to the door is RAP power:

This is the advantage that you had as the owner of a 2004 model.

It's much easier to tap into the RAP circuit for you guys.

That relay doesn't exist in the 2005+ cars. The space for that relay is left blank, like this:



There is no wiring that leads into the terminals under that blank relay spot, either, as I discovered upon dissection.

Hence my expedition under the rear parcel shelf and into the RIM.
 

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2004 V (B&M, muffler delete), 2003 Corvette
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83 Posts
Discussion Starter #65
Re: Last Word on DIC Retention with Aftermarket Head Unit - Illumination?

Oh, I didn't know they changed that!

BTW, the other reason I kept the base radio working is for OnStar - still works fine. I assumed that it comes over the radio, and doesn't take over the Bose, but I didn't test to find out.

Now ... I need to find a source for illumination level, the screen is still too bright. I put the same unit in my Corvette, and ended up adding a little knob and pot so I have a separate dimmer for it.

:noidea: Anybody know where there's a dashboard illumination wire?
 

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ZIP
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Well, I finally got around to finishing. I went a little different way, I kept the radio functional and fed it into the new head (Pioneer AVIC-Z130BT) as a line-level audio input. This way the stock radio works, and all the buttons work like the station presets. I didn't like the idea of a bunch of dead buttons, that would bug me. The Pioneer front line output goes to the stock Bose, so the stock head unit volume control & audio settings are fully functional. Have some pics!

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228674"/>

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228682"/>

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228690"/>

I also tracked down where to get Retained Accessory Power (RAP) for the switched +12, so the new head and the radio both stay on until a door is opened. It bugged me to have to turn off with the key while the radio stayed on.

Passenger side fusebox, in front of the rear seat, the relay closest to the door is RAP power:

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228698"/>

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228706"/>

The front pin closest to the door is switched RAP power. I was just taking a signal level, so I got lazy and just stuck a wire into the socket and put the relay back:

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228714"/>

That's pin 87, the wiring diagram is right on the relay:

<img src="http://www.cadillacforums.com/forums/attachment.php?attachmentid=228722"/>

That's it! I'm happy, it does just what I want. I did have to add a GPS antenna and a mic; I think I could tap off the mirror mic sometime and get rid of that.
That looks great. Like factory, which is hard to do...
 

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2005 CTS-V
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20 Posts
Re: Last Word on DIC Retention with Aftermarket Head Unit - Illumination?

Oh, I didn't know they changed that!

BTW, the other reason I kept the base radio working is for OnStar - still works fine. I assumed that it comes over the radio, and doesn't take over the Bose, but I didn't test to find out.

Now ... I need to find a source for illumination level, the screen is still too bright. I put the same unit in my Corvette, and ended up adding a little knob and pot so I have a separate dimmer for it.

:noidea: Anybody know where there's a dashboard illumination wire?
My wall of text, post #58 under the heading "Issue 1", gives a link to the serial number of the car where this changeover occurred.

I'm envious of your relay! That would have saved a lot of time. At least I didn't have to dig into the headliner, though! That would have been a showstopper.

The way my new head unit is wired, all the buttons on the factory radio work. The station presets change the station of the factory head unit, but of course no sound is coming from it now, so just the station frequency numbers change in its face. But all the usual "pings" and "bongs" play through the Bose still. It's very nice to have the factory volume knob run the aftermarket head unit volume, since the Parrot Asteroid Smart has no rotary knob, and relies on its touchscreen for volume. So the factory head unit effectively adds the missing rotary volume knob. I can't say about OnStar, as I have never had a subscription to it.

For the illumination level, I tapped a terminal on the hazard switch, that gets backlit when the headlights come on. Can't recall now which terminal, but you can probe it with your multimeter, turning the headlights off & on, and it's obvious. It's just a 12v+ switch, on or off, not variable. But that should work with most aftermarket head units.
 

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2004 V (B&M, muffler delete), 2003 Corvette
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Discussion Starter #69
I kinda want to do this... But JESUS that's a lot of exta work just to put in a non obsolete head unit..
Hey man, it's a hobby! When you work at home you need projects on the side to stay sane.

Is it worth the effort? Your mileage may vary - I sure like touch-typing in addresses while in motion, and streaming Pandora using the touch screen.
 

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2004 V (B&M, muffler delete), 2003 Corvette
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Discussion Starter #70
Re: Last Word on DIC Retention with Aftermarket Head Unit - Illumination!

Oh, I didn't know they changed that!

BTW, the other reason I kept the base radio working is for OnStar - still works fine. I assumed that it comes over the radio, and doesn't take over the Bose, but I didn't test to find out.

Now ... I need to find a source for illumination level, the screen is still too bright. I put the same unit in my Corvette, and ended up adding a little knob and pot so I have a separate dimmer for it.

:noidea: Anybody know where there's a dashboard illumination wire?
Found a variable-voltage illumination source, under the steering wheel kick panel. Zero when dash is off, varies from about 3V with dimmed lights to 11+ when fully bright.

Remove the covers under there, then you have to remove the metal support (two 10MM bolts). That uncovers these connectors, the yellow wire (here with a probe in it) is that source - in my 2004, anyway. There are yellow wires on both sides as it's a fuse block, and I don't have any idea if I'm before or after the fuse. If I wasn't lazy I guess I'd physically trace wires to find out (or, hummm why didn't I think if that before ...) pull the fuse to find out which side is protected (oh, well, 50% chance I'm good).

IMG_1727.JPG
 

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2007 CTS-V
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612 Posts
Yeah I hear that. Was looking for base CTS cd radios on ebay yesterday. What's a reasonable price one should expect to pay for one of these units that isn't all scratched up? Seemed like the nicer looking ones were between $80-100?
 

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2004 V (B&M, muffler delete), 2003 Corvette
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Discussion Starter #72
Yeah I hear that. Was looking for base CTS cd radios on ebay yesterday. What's a reasonable price one should expect to pay for one of these units that isn't all scratched up? Seemed like the nicer looking ones were between $80-100?
Give this search a shot:

http://www.hollanderparts.com/used-auto-parts/2003/cadillac/cts/electrical/638~radio-audio/638-00175~am-fm-stereo--opt-u2r---cd-player/

They found me a good one for $45 in a boneyard 20 min away, and I got to check it out before buying (actually, they had three for me to pick from!)
 

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I'm looking at buying an 07' this week. It has the volume controls on the steering wheel. I would not be able to deal with the stock nav. What is all involved with retaining DIC? I'm assuming I need .
-Base CTS DIC (programmed)
-Aftermarket Radio
-Harness that let's me retain volume steering wheel controls to aftermarket HU?
-Factory harness goes into DIC and that's it right?
-Run an illumination wire to aftermarket HU


I plan on deleting all the Bose stuff and adding my own wiring and amp. Are the tweeters wired to the front speakers?
 

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2005 CTS-V
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If you plan to delete all the Bose stuff, then you are out on your own with respect to the wiring instructions that I posted earlier in this thread.

The volume knob on the base CTS DIC radio operates the volume level on the original Bose amp. The knob doesn't have any direct connection to the aftermarket head unit at all. It "controls" the volume of the aftermarket head unit simply by increasing or decreasing the volume of the Bose amp. The connection between the DIC and the Bose amp is a Class II data stream, not a simple analog signal. So I kind of doubt that you could easily connect the volume knob & base DIC to an aftermarket amp.

My 2005 car does not have volume buttons on the steering wheel, but I would guess that the steering wheel volume on your 2007 car works the same way as the dashboard knob. That is, those wheel buttons are wired into the DIC, which then tells the Bose amp to either increase or decrease volume, via Class II data stream. So the volume knob on the base CTS DIC would be inoperative without the Bose amp. And so if the steering wheel buttons were just plugged into the base DIC as per stock wiring, they would do nothing.

Maybe the steering wheel controls can be "intercepted", and adapted to connect directly to an aftermarket head unit or amp, but you'd have to search for threads on that specific issue (maybe in the base CTS forums here, as more of those cars had steering wheel volume controls than did the CTS-Vs).

I'm looking at buying an 07' this week. It has the volume controls on the steering wheel. I would not be able to deal with the stock nav. What is all involved with retaining DIC? I'm assuming I need .
-Base CTS DIC (programmed)
-Aftermarket Radio
-Harness that let's me retain volume steering wheel controls to aftermarket HU?
-Factory harness goes into DIC and that's it right?
-Run an illumination wire to aftermarket HU


I plan on deleting all the Bose stuff and adding my own wiring and amp. Are the tweeters wired to the front speakers?
 

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2007 CTS Sport
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63 Posts
Just finished my nav install but have a crackle noise at low volume. Any idea what is causing it?
I used rca cables to wire to the speaker outs of the stock HU.
 

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05 maggied CTS-V, 2017 NSX Whoo Hoo!
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The output from the Bose HU is differential.

You need to convert the signal to single ended if coming from the stock HU to a different amplifier and you don't get volume control as that is a classII Bose interface.

If you are going from an ext unit into the Bose, you need to convert the single ended audio to differential (no ground, but a shield).
 

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2004 V (B&M, muffler delete), 2003 Corvette
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Discussion Starter #77
I just "spliced" my Pioneer head unit into the CTS head unit -> Bose amp path. CTS head unit out -> Pioneer aux in, and Pioneer line out -> Bose amp w/o any noise or distortion that I can hear (of course, my ancient ear is mostly made of wood).
 

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05 CTSV
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Bumping this up for a question.
www.car-part.com list a whole bunch of different options under 2005 CTS CD player. Like over 20 choices.
U2S and U2R along with a bunch of different ID numbers. So which one of them do I want?
 

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Here I am all these years later and this stuff is GOLDEN! Thank you so much! BTW - the pin is actually 87a. 87 is in the middle.
I added a relay that is powered by the aftermarket power antenna lead to switch the speaker source. OEM by default, aftermarket when on.
 

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07 Silver V Sport Susp.
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147 Posts
Does it matter which radio we use:

CTS 04-05 AM-FM-stereo-CD player (opt U2R), ID 10387598
CTS 04-05 AM-FM-stereo-CD player (opt U2R), ID 15950588
CTS 04-07 AM-FM-stereo-CD player (opt U2R), ID 15887288
CTS 05 AM-FM-stereo-CD player (opt U2R), ID 15824244
SRX 04-05 AM-FM-stereo-CD player (opt U2R), ID 10387598
SRX 04-05 AM-FM-stereo-CD player (opt U2R), ID 15824244
SRX 04-06 AM-FM-stereo-CD player (opt U2R), ID 15887288

Thanks, I didn't realize there were so many different model numbers.
 
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