It was more of an example where to find additional information. As you have "12 Delco/GM Auto Radio", it is perfectly understandable that people are going to search for radios that came out of General Motors vehicles (auto radio).
Not happy with CAN bus discussion? I CAN appreciate that, so will change title of this post to reflect what you are seeking / desire.
You specify that only thing that matters is finding diagram for "DELCO PN 15766185". Challenge accepted. I will do everything for you, you will merely have to click on the links, maybe copy/Paste to follow along.
Duckduckgo.com -> search terms "Used DELCO 15766185 Radio"
And I get:
This is important because it lists a donor vehicle, and the RPO:
"OEM Radio Opt Umr FROM 03 2003 CHEVY SILVERADO 15766185"
2003 Chevy Pickup, RPO code is UMR
Seller is a salvage yard. They are experts on interchange. In Full Description, there are at least 2 vehicles that have same RPO code. Again, that is "UMR" in case you missed it.
Interchange vehicles are 2012 GMC Canyon and 2012 Chevrolet Colorado. The both use UMR, other vehicles use UM7, and are typically older models. Let's run with the 12s (see what I did there?).
Duckduckgo.com -> search terms "2012 Canyon UMR radio diagram" and found somebody in same situation, asking for. "Need a stock radio wiring diagram. Please help!" located at
A bit down the page, Shawn5800 kindly posts a schematic of the radio connector located at
But you want a pinout, and understandably so, since you were very specific in your OP title / subject.
At bottom of the thread, somebody else was looking for a 2012 Wiring Diagram. Since was a subject in audio portion of Colorado / Canyon website, I followed it. On that thread, there is a link " "
Thinking it held some desirable nuggets of information, I followed it just to find its a dead link. But, I CAN try and resurrect it at archive.org:
archive.org -> Search Terms " "
and chose a date that corresponded with peak traffic.
That led me to: but nothing available, missing Dara or not ceawled.
Re-searched again:
Duckduckgo.com -> Search terms "DELCO PN 15766185 pin out"
and hit first result " "
And lo & behold, pin out for 24 pin radio connector AND for the 12pin connector as well. BONUS!
To keep going, I searched Amazon for OEM Radio Harnesses (not posting link as may contain personal information and is around 400 characters long). Saw Metra in results, remembered using them in past. Eventually drilled down to the Metra 70-2006 harness. Not available, and they don't know when will be... But I have part number. Metra 70-2006.
Duckduckgo.com -> Metra 70-2006 manual
Lo and Behold, I found the manual @ Crutchfield!
That's odd. There are some differences between it, TechnMagazin. But, there are some differences. Probably features and stuff, I don't know. Maybe different country. Something for you to figure out. Maybe it's the difference between UMR and UM7.
Back to what I am supposed to be working on: what caused the cpu in a German plc on a krv traction container to blow out, before I risk blowing the replacement. Looks like water intrusion but have to.... sorry. Forgot this thread was all about "Pin Out Required for 12 Delco/GM Auto Radio Without Mentioning ANYTHING ELSE!!! And do it for me ( Please?)".
15min break is over, back to work. (Drops the mic)
~SD
Gooey