Building an AUX Line IN Circuit for my 2004 Cadillac CTS @wowtorreon
Building an AUX Line IN Circuit for my 2004 Cadillac CTS  @wowtorreon
Uploaded April 2013 | Updated September 2026, 15 minutes ago
My Sirius Satellite Radio died a few weeks ago and instead of dropping more $ on a new one, I decided to just use my mobile phone instead. The problem is that my 2004 Cadillac CTS does NOT have an AUX Line in to support it. So, after some research, I found something that will let me add one!

In this video, I'm just building the circuit and testing it. I'll need to find a better time to install it in my car (that will be a another video sometime in the future).

Here's the video from Dronix69 that I found that started it all:
youtu.be/VTbBg5OLH9Q

The Cadillac Forum thread that has both the original design and the modified circuit using Radio Shack Parts:
cadillacforums.com/forums/cadillac-cts-first-generation-forum-2003/237768-how-aux-line-cts-without-sat.html

Much thanks to forum members Dronix and pyromosh for doing the legwork!!

The Radio Shack Parts list:

1/8" Stereo Panel-Mount Audio Jack (2-Pack)
radioshack.com/product/index.jsp?productId=2103452

Dual Mini Board with 213 Holes
radioshack.com/product/index.jsp?productId=2104052

12VDC Coil DPDT Miniature PC Relay (need two)
radioshack.com/product/index.jsp?productId=2062483

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Music provided royalty free:

"Killing Time" by Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/by/3.0
incompetech.com/music/royalty-free/index.html?isrc=USUAN1100570
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Building an AUX Line IN Circuit for my 2004 Cadillac CTS

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