ok guys, if anyone has some insight on this please chime in.

I have an Alpine 9833. the car has extra speakers wired in and bypassed the factory harness. I am installing an IR DCI and got it all hooked up and this is the result.

Volume down - Volume down
Volume up - Volume down
CH - Volume up
Mute - Mute
Mode - Mode

So i dont have the CH option basically...and volume is mixed up Now why on earth would this happen ?
all the tap n press works...

What I would love to know is how are the audio controls interpreted? Is it different voltages for the different functions? Does the ECU control that...or a similar processor?

Now, I have a 2000, but I swapped a 2002 ECU in...think that would make a difference?

Mind you, there is a rats nest of wires because of the other speakers and I have really checked ground/voltages, etc.

Any ideas? Its working.....just oddly as if whatever interprets the dash controls is confused?

 

The CH button is to be used in conjunction with other buttons. Hold CH and push volume up....you will go up to your next preset. Volume down, and you will go down a preset.

 

I would make sure you have the dip switches on the DCI set for your HU.

 

here's Modifry's troubleshooting instructions for the technically adept -
it gives a pretty good explanation of what happens when you push a button:
http://www.modifry.com/products/dci/tech.htm

 

I just found that using our new and improved search feature! Exactly what I am looking for...

I dont want to post another thread for it, but its kind of a different issue...might be related to the resistance values however.

As I said before there are additional speakers run, so there are a lot of extra wires not in the factory wiring harness. In addition to that there is a relay that when 'mute' is pressed, it energizes the relay and sends an interrupt to the HU? To my knowledge thats all it does. Any reason why this would be in there? I'm at the mercy of I believe 2 owners ago's work. I've disconnected it and it has no effect on anything (other than the interrupt..)


Also to troubleshoot this more, I'm going to throw in the stock HU and see how it interprets the audio controls, but that chart on that page is exactly what im looking for! I wish I had found that last night.

 

relay is one of two things -
if rear speakers were originally added using Lucid's adapter harness, he
had a relay because the early OEM headunits only muted the front speakers.
otherwise, since most Alpines support a wired cell phone attenuate function,
whoever wired your car realized he could keep the mute button by inverting
the mute button signal to a ground with a relay.

 

Thanks


Sounds pretty logical....and also optional

 

definitely optional, and if you're using modifry's dci, totally unnecessary
regardless of whether you wire the DCI using the hardwire mute or
the IR mute options

 

Well, i made some more progress now that I'm home from work. Here is an email I sent to modifry, I'll post it up here if anyone has any ideas?

Bob,

I have a situation that I would hope goes past the technical troubleshooting section on the site (which was very helpful!)

I am trying to wire in the IR DCI with my Alpine 9833 head and am having a little problem. The DCI is in but is acting weird.

Mode = Seems to work ok
CH = sometimes ok, sometimes volume up
Mute = ok
Volume up = volume down always
Volume down = volume down always


I have 2 things stumping me. I've attached a table that I took measurements on. What alarms me is why there is such a resistance drop with the DCI plugged in? When i mean disconnected, i just unplug it from the harness. The resistance values are way low, but when I unplug the DCI they rise to what you have on your table for the correct resistance. And there is no voltage when the DCI is plugged in?? I'm measuring from the green wire on the factory harness side.
also, the DCI to me seems a little warm? What worried me, is due to the lower resistance level, there would be more current, could that be causing an issue?

The other thing stumping me, is when the DCI is plugged in i measure approx 4.11 volts using the Head units case as reference (ground)...when I use a screw head on the bracket harness (and multiple other ground points in the car) I'm at like 5.26! Thats drastic! Butttt....when I measure the resistance between the case and another ground point I'm getting 0 ohms! its a short?? How can there be that much voltage drop?


Any ideas? thanks a lot!

Nate



The attached document was this chart

 

I'm no EE, but I believe the way an ohmmeter works is by applying a voltage
to the wire/circuit and measuring it's drop, so if something else (the DCI) is
applying voltage I don't believe you'll get useful results.
the thing that's consistent in the DCI's misbehavior is that it appears to be
measuring too low a resistance (your erroneous commands are always
associated with a lower resistance), which would imply to me a parallel
voltage path, ie a short, but a relatively high resistance one, between the DCI
and the dash wire. I'd look for bent pins in the harness or other bad
connections. of course, could be a bad DCI too. Or a bad headunit.
do you have an Alpine remote control? does it do what it's supposed to?