Cadillac Repair Questions? Ask a Mechanic for Answers ASAP
sorry for the delay.............Greetings...... “Hi, I’m Don (aka MOLurch) and I look forward to helping you!”.
I can post GM Schematics showing Signal & Audio Input / Output, but I cannot tell you "how to connect", as I do not know what & how you have wired the system & cannot see itIF you need the Schematics, please accept the "Offer for Additional Service that I have sent
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If you have all schematics, the Front & Rear Screen gets its DATA to turn on from the BCM, as most GM Radios do.Schematic will also show the Front "trigger" is tied to the Rear "trigger" which powers "both"The BCM has to have a request from the Ignition, Radio On to send the DATA Signal to front & rear screens.
IF you would like to keep this open, I can OPT OUT & Relist to see if someone else has that infoYou may also want to join "the 12 Volt" & post same in Video Forumhttp://www.the12volt.com/installbay/vehicles.html
BCM should be a Ground - signal / DATA