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John Friederich
Posted on Sunday, October 20, 2002 - 03:18 pm:   Edit Post Delete Post Print Post

I would love to hook the speaker lines from my Garmin Streetpilot III GPS into the Disco II radio (standard, no upgrade, 2001). It would be great to use muting if possible when ghe GPS 'speaks'.

Help please...?

John F
 

Paul de Man (Deman)
Posted on Monday, October 21, 2002 - 11:09 am:   Edit Post Delete Post Print Post

Check:

http://www.disco2.com/tech/bodyelec/ice.phtml#pinout

You should be able to mute the radio, at the very least. Depending on the connectors available on your radio, you may be able to wire in the Garman Speaker output.

(If you wire a speaker output into the radio input do so at your own risk, you may end up blowing the inputs on the radio - turn the volume all the way down - adjust it and glue the volume control so it won't move. If you have a headphone or aux output from the GPS - use that)

.....Paul
 

Tom Hyslip (007)
Posted on Monday, October 21, 2002 - 11:41 am:   Edit Post Delete Post Print Post

You should try the cassette tapes that are made to hook to portable CD-Rom players and play it through the stereo via the tape. I have done it with a Laptop and DVD, worked great. The "tapes" are ~$10 at wal mart, etc.
 

Carter Simcoe (Carter)
Posted on Monday, October 21, 2002 - 11:46 am:   Edit Post Delete Post Print Post

That is a damn good idea Tom.
 

Pugsly
Posted on Monday, October 21, 2002 - 11:48 am:   Edit Post Delete Post Print Post

But that wouldn't mute the radio. You would have to chose between listening to the GPS or listening to the radio.

On my RR, the NAV system 'talks' through the stereo system, muting whatever you are listening to. It also works if the radio is not on. Think of it as a localized 'we interrupt regularly scheduled programming for this important announcement'.

Some aftermarket stereos have the ability to do this as well (the one in my 110 does, but I haven't figured it out yet).
 

Carter Simcoe (Carter)
Posted on Monday, October 21, 2002 - 11:53 am:   Edit Post Delete Post Print Post

Yeah, I just doubt that with the stock head unit he will be able to rig up the thing so it mutes and switches input sources when the GPS starts talking. It would be cool if someone could find me wrong though.
 

Paul de Man (Deman)
Posted on Monday, October 21, 2002 - 03:43 pm:   Edit Post Delete Post Print Post

I just looked at the Garmin web site and the Streetpilot III has no mute line...DUH.

You need a circuit that will provide ground (I think) to the mute input of the LR radio whenever there is audio out...but I guess that's what you were asking for in the first place.

BTW don't hook up the speaker to the audio in of the LR radio. The Garmin manual warns against doing that.
 

John Friederich
Posted on Monday, October 21, 2002 - 05:17 pm:   Edit Post Delete Post Print Post

On second thought I could hook a decent speaker under dash for the GPS speaking - getting the radio mute to work would be all that is needed then.

How can I find out what exactly the radio mute line wants to see to mute the headunit? Ground? 12vdc? I'm sure I can rig a circuit to do either when it detects signal from the GPS speaker lines.

Thanks for steering me in the right direction...

-John F
 

John Friederich
Posted on Monday, October 21, 2002 - 05:24 pm:   Edit Post Delete Post Print Post

Ah, just spoke to a local auto radio installer, and he said all headunits that he is aware of that have a mute line work with a ground trigger - as long as the mute line goes to ground, the headunit will mute. When ground is removed, sound comes back on.

I'll see what I can design to make this work.

Now, can anyone help me identify the mute line on a 2001 D2, stock headunit? I was under the impression it had one, but I don't know where I heard that, or if I dreamed it up.

-John F
 

Tom Hyslip (007)
Posted on Monday, October 21, 2002 - 08:49 pm:   Edit Post Delete Post Print Post

You are correct about the muting of the radio with the "cassette tape" but when the tape is in the player, the radio won't be on anyway.

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