2010 MKZ 104,000 mi - when I am running the engine /driving, the radio indicates it's on but no sound. If I stop the car and turn off the engine, the speakers come back on. Sometimes if I let the radio play before I start the engine (key in ACC position) and then start the car the speakers may not cut out - I get lucky every so often. Lincoln dealers say they never heard of that type of problem, but for $149, they'll do a diagnostic and maybe will identify the problem. This problem seemed to start after the dealer changed my battery because I never had that issue before. Lincoln dealers say they never heard of that type of problem, but for $149, they'll can do a diagnostic and maybe identify the problem. I called Lincoln directly and the chat person was no help.
Any suggestions? (like a ground issue that you mentioned on one of your videos?)
Thanks Scotty!
Bump.
That's a real head scratcher and I ain't a "radio guy".
I can't see it being a Ground Issue because it works in the Key Accessory position.
It will play when the car isn't running (Key ACC) and sometimes you can get it to play if you start out with the radio ON in "Key Acc" and then Start it.
So basically the radio likes to play when the motor isn't running. (but you can fool it sometimes)
Yet it shows that it's ON when the speakers aren't working so it has power and ground.
I admit that I'm "grasping for anything that may float" but maybe it has something to do with that "Speed Compensated Volume" option in your system sound settings.
Your speakers work when the engine isn't running.
Your Media/Nav system has to have an input to monitor vehicle speed (voltage waveform) for that "Speed Compensated Volume" option to work.
Is it possible that with the Key in the "ACC" position a voltage signal isn't provided but then when you Start the car the voltage signal is provided and it's so corrupted (shorting out/interference) that the Media/Nav system defaults to Mute?
Or is the problem in the Media/Nav system itself? Is it unable to process any voltage signals to its "Speed Compensated Volume" input?
It would be interesting to obtain a pinout for your Media/Nav system wiring connectors and observe the voltage inputs on that "Speed input" at Key ACC and then when the engine is running and the car isn't moving.
Is the signal a discernible voltage waveform or noisy gibberish?
Maybe try turning the "Speed Compensated Volume" option off but if the issue is in the Media system itself, it probably wouldn't help.
Maybe check in your owner's manual to see if you can reset the system to factory defaults. ((why not try?))
.....just submitted for your consideration. Like I said, "I'm grasping" here
