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2014 Cadillac CTS VSport
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2,318 Posts
Discussion Starter #1
Ok, I got a question regarding muting the radio. When you press the onstar button for example the radio will go off and you will hear the onstar prompts through the radio amp. What type of signal is sent to accomplish this?

What I would like to do is take my headphone output of my radar detector and connect it to some device that will automatically switch the level inputs on the amplifier from the radio line output to the output on my radar detector speaker jack.
 

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2003 CTS Manual Trans., '93 STS
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3,035 Posts
I'm going to have to look at the VCIM schematics in my Helm manual when I get home. I'm not sure if it's a serial message over the class 2 bus, or if it's a discrete signal from the VCIM.
 

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2017 CTS-V
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1,670 Posts
When you hit the onstar button, the VCIM sends a signal over the serial databus to the amp and tells it to switch to the OnStar input. When the call is ended, another signal is sent to tell the amp to switch back to the radio input.

If it was a simple grounding to switch the input, it would make what you want to do much easier. Unfortunately, all the signals are sent over the data bus.

It is possible to rig up a set of relays to the Onstar button and make it so when the radar detector outputs sound, it simulates an OnStar button press by shorting the switch. Another relay would press the button again when there is not sound to end the input switch. Then you would simply disconnect the audio input from the VCIM and wire in the radar output. The microphone should also be disconnected to prevent inadvertant activation of OnStar functions. This would disable onstar though.
 

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2014 Cadillac CTS VSport
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Discussion Starter #5
There should be an easy solution out there somewhere and the same device would make all the Ipod folks happy as well.

I have ordered one of these:

http://www.abtelectronics.com/product/17921.html

for my home theater since the component inputs went in my $1200 receiver. This device is for audio and component video and it automatically will switch device by sensing if another device is turned on by sensing signal in the a/v inputs. So if I turn on my DVD player it will automatically switch the inputs to the DVD inputs.

There must be a device out there that is used for just audio. Since the radio uses line level outputs it would be easy to put RCA jacks on those wires and connect that as well as an output from another device (Ipod, Radar Detector, Etc.) and input it to one of these automatic switchers??

Doing some type of auto sensing RCA switch would alleviate the need to even touch the databus?

Also, Since I always use XM anyway are there RCA Jacks on the XM module? It might make slicing into the signal easier.
 

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2017 CTS-V
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The auto sensing switch would work even better. I haven't come across anything like that for just audio though...
 

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I wanted to figur ethis out too.. The databas has been the brick wall...

I was trying to integrate my own car kit using this method... When onstar goes on, it auto pauses (or mutes) the cd (or radio)... The ipod thing is working, but its a specialized device so far... There is a company that makes a onstar integration device, but not for our car yet..

Reed
 

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2014 Cadillac CTS VSport
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2,318 Posts
Discussion Starter #8
ctsvett said:
I wanted to figur ethis out too.. The databas has been the brick wall...

I was trying to integrate my own car kit using this method... When onstar goes on, it auto pauses (or mutes) the cd (or radio)... The ipod thing is working, but its a specialized device so far... There is a company that makes a onstar integration device, but not for our car yet..

Reed
What is the Ipod thing?

Also, How are the chimes connected to the amplifier? Are they also using a signal from the databus to merge a chimes input on the amplifier?

Somthing like this: http://www.soundgate.com/index.php?request=product.details&productid=459
Would be a perfect solution if they offered it in an autosensing version.
 
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