I have an Alpine 9815 and Lucid's DCI. A few weeks ago the car started to go in and out of mute on its own. I thought it might be the mute connection so I went back and resoldered the wires in the DCI. Now the mute button doesn't work at all but the light goes on when you press the button. Everything works fine from the HU itself. What gives?

Thanks.

 

Sounds like either the box or the wiring to me. You could check the stock controls by just unpluging the DCI and the Alpine HU and hooking up the stock HU just to test it out. That should prove its the wiring or the box.

 

Any way to test this without the stock HU? I sold mine months ago. Thanks

 

Do you have electrical meter?

 

I sure do! Thanks for the help man

 

You'll have to ohm out the mute button to make sure its not that, and continue to do the same thing with the wiring and DCI box. Ohm out each one and see if it has a short in it somewhere.

 

Hey, ideugene, I recognize that name!

The dash mute circuit puts out a +12v signal when mute is ON. It should have no voltage when mute is OFF. The DCI changes that +12v to a ground when mute is ON and no voltage when mute is OFF.

If you put a voltmeter on the DCI purple wire you should read the voltage coming from the dash switch. Make sure it goes on and off with each press of the dash mute button.

Check the DCI blue wire to see what' sbeing sent to the HU. Bear in mind the HU may put a voltage on the blue wire, so it may read ground with mute ON and +5v with mute OFF.

Typical mute failure is where the dash circuitry gets fried and stops putting out a +12v signal when mute is ON. This is usually caused by shorting the dash mute wire to ground, even for a second. It's a very small surface-mount transistor that gets toasted. If your mute LED on the dash does not go from fully out to fully bright that's an indication the dash mute circuit is bad. I've seen where it either stays on all the time or changes from bright to dim, both cases mean the dash mute circuit is blown.

And of course it could be a bad DCI. If you find the dash switch readings on the purple wire are good but the DCI output on the blue wire is not let me know.

.

 

and there you have it Thanks buddy!

 

Thanks man! BTW the new domelight works GREAT!

As for the radio, I think my colors might be mixed up. I didn't have a chance to carefully look at it but There's a wire labeled "Dash Mute" which is green. I just looked at Lucid's website and it says that the mute signal is supposed to be purple as you said. Some of the colors may be different. Can someone lead me in the direction of where I can find the wiring diagram for the stock harness? I have where all the wires go from the HU but I'm not sure if they're matched up correctly in the stock connector.

Thanks!