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12 Posts

09-12-2010

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T605 Installations

2010-09-12, 21:54 PM

I just wanted to share some of my experiences on installing the Motorola T605 Car Kit.  I have installed 4 of these devices so far:

1987 Porsche 944S with aftermarket stereo

1998 Jaguar XJR integrating into factory Alpine/Harmon Kardon premium stereo

1993 Audi 90CS with aftermarket stereo

2004 Volvo XC70 with factory HU-613 stereo

First off I would like to mention the wiring error that some of these kits have.  The orange and yellow wires are swapped on some kits.  If your mute function is not working make sure your wires are not swapped.  You can use a regular 12VDC test lamp.  Connect the clip of the test lamp to a 12VDC power source.  Probe the yellow wire and confirm that the lamp lights when the hands free communication is active (making a call, taking a call, etc).  It should also activate every time you start the car and the kit connects to your phone.

Some of the later kits do not have tags on each wire like the earlier kits did.

Description
Motorola T605/IHF1000
Motorola HF850
    
Audio line input negative (-)
(6-pin) Blue
Audio line input positive (+)(6-pin) Orange*
Mute(6-pin) Yellow*(6-pin) Orange
Microphone positive (+)(2-pin microphone) White(2-pin microphone) White
Microphone negative (-)(2-pin microphone) Braid(2-pin microphone) Braid
Ground(6-pin) Black(6-pin) Black
Battery positive (+) (hot at all times)(6-pin) Red(6-pin) Red
Key switch (+) (hot with key ON only)(6-pin) Green(6-pin) Green

* Note:  Some wire harness have these swapped.

I am attaching details of the Jaguar install.

On the Volvo, the best way to integrate with the factory stereo is with a Melbus adapter.  Mine has the HU-613 head unit.  There is an open Melbus port on the back of the stereo head unit.  There are several companies that make adapters for this.  USA Spec, GROM (http://www.autotoys.com/x/product.php?productid=14272), to name a few.  Some people have hacked into the head unit and tied into the line level inputs as well.One thing to be careful of on the Volvo is accidentially setting air bag fault codes which can only be cleared with a dealer service tool.  When removing the head unit of the Volvo, you need to first remove the HVAC control panel.  Do not disconnect the wires from the HVAC control!  Just move it to the side, leaving the wires connected.  If you do key it ON with the HVAC connected, you will see the SRS Service Urgent message and a yellow triangle light ON.  They will stay ON until cleared by the dealer.  Some independent shops can also clear these codes but generic OBDII scan tools generally can't. 

Download:
FLVMP43GP

On aftermarket stereo's, or any system that does not support the line input for the telephone functions, I used a relay to output the sound to the left front speaker in the stereo sound system.  You just need a double pole double throw relay.  I bought these at Radio Schack.  Power the relay field with the same circuit you use for the green wire on the car kit.  Then connect the other relay field wire to the mute line.  This will not mute the stereo but at least you won't need to hunt down a place to mount the speaker.  I used this approach on the Audi, Porsche, and Volvo.

On Android phones you need to automatically adjust the volume up when the car kit connects.  The T605 is really expecting this.  If you attenuate the sound in the A2DP stream (via the phone media volume) the sound quality suffers.  I made a simple app for this.  I posted this on the Android Market now.  Just scan this QR code:

http://home.mchsi.com/~jroal/exe/QR.png

or search the market for "A2DP Volume".  The open source project is here: http://code.google.com/p/a2dpvolume/  This app also captures your car location when you disconnect from your bluetooth car kit so you always know where you parked your car.

I hope this help others out.  I would have liked this info back when I did mine.  I love the T605 kit because it is inexpensive and it works very well.

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12 Posts

09-12-2010

United States

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Re: T605 Installations

2010-11-26, 13:22 PM

... Just a follow up on this post.  I now put the application for managing bluetooth streaming volume on the Android Market.  Just search for "A2DP Volume".  The open source project is here: http://code.google.com/p/a2dpvolume/

The easiest way to get it is to scan this QR code with your Android device:

http://home.mchsi.com/~jroal/exe/QR.png

This application is free and open source.

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12 Posts

09-12-2010

United States

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Re: T605 Installations

2011-04-30, 3:46 AM

Volvo update.

I installed a GROM interface for the Volvo now so I can stream A2DP stereo.  I used this unit:

http://www.gromaudio.com/store/usb_adapters/volvo_01-06_usb_ipod_adapter_direct_digital_interface.html

.  However, they also make a simpler (and less expensice) AUX input adapter which is all that was really needed.  Works well.  The install was very easy.  Took maybe 20 minutes.

The only issue I have with it is a pop through the speakers when I start the car and the stereo is set to CD-Changer (which is actually this GROM unit).  If you start the car on any other input there is no pop.  Not a big deal at all really.  I also notice a bit of background hiss before the music streams.  Again, not really a big deal. 

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6 Posts

08-14-2012

US

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  • Message 4 of 4

Re: T605 Installations

2014-09-27, 2:53 AM

Now I did another install in my 2006 Porsche Cayman S with Bose and CDR24.  Details here: http://a2dpvolume.blogspot.com/2014/09/motorola-t605-install-in-2006-porsche.html

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