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| T O P I C R E V I E W |
| hcornea |
Posted - 09 juil. 2007 : 02:54:31
Has anyone looked into the the pinouts on the mount of a nuvi?
What (apart obviously from power and traffic) is available there. eg audio out? |
| 15 L A T E S T R E P L I E S (Newest First) |
| vanmoto |
Posted - 19 mai 2012 : 21:06:33
Did anybody find out if the Nuvi supports mute out?
quote:
Originally posted by mige0
quote:
It been a long time!! thanks to all! I have my nuvi855 connected to my car, with audio out enabled throught the cradle, no audio from internal speaker (no dummy plug) and rear view camera connected when I use the reverse gear.
These are the pinouts a discover, they are all from the craddle, you have to route them to the hirose:
I will upload a video to show you how its working.
Pin 1 -12V
Pin 2 -12V
Pin 3 -DeviceID GND
Pin 4 -DeviceID
With a resistance connected between this two you can have:
8,1 kohm ->Garmin Serial Cable Slave
3,6 kohm ->Garmin Serial Cable Master
15,4 kohm ->Power Cable
2,15 kohm ->Vib (I'm using this one)
Pin 8 - 12V(negative)
Pin 9 - 12V(negative)
Pin 10- Audio Right
Pin 11- Audio Left
Pin 12- Audio Ground
Pin 13- Mic
Pin 14- Mic Ground
Pin 15- Camera detection (When this one is connected to ground, enables the video camera. I am using it with a relle conected to the reverse light, works perfect)
Pin 29- Video In Ground
Pin 30- Video In
Pin 31- Cradle ID Ground
Pin 32- Cradle ID (With a resistor between this two, you can get:
.38V -> 7,4kohm -> Volvo
.2V -> -> Car (This one is the cradle I have)
.0V -> -> Development (I don t know what this is for)
I still have some noise, but It's much lower since I hooked all grounds together. Maybe I have problems in alternator.
Thanks all again!
PD.I will upload a video to my site ebancora.com.ar
Anybody who did spot a "mute" signal to be output from the navi ?
This would allow to interface directly with car sets that are prepared for phones.
the "mute" signal should go low (connecting to ground) anytime audio is output by the navi, which tells the car set to automatically switch to the phones input no matter what source currently is selected (CD, FM, MP3 ...)
Best
Michael
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| mige0 |
Posted - 26 déc. 2011 : 12:50:30
quote:
It been a long time!! thanks to all! I have my nuvi855 connected to my car, with audio out enabled throught the cradle, no audio from internal speaker (no dummy plug) and rear view camera connected when I use the reverse gear.
These are the pinouts a discover, they are all from the craddle, you have to route them to the hirose:
I will upload a video to show you how its working.
Pin 1 -12V
Pin 2 -12V
Pin 3 -DeviceID GND
Pin 4 -DeviceID
With a resistance connected between this two you can have:
8,1 kohm ->Garmin Serial Cable Slave
3,6 kohm ->Garmin Serial Cable Master
15,4 kohm ->Power Cable
2,15 kohm ->Vib (I'm using this one)
Pin 8 - 12V(negative)
Pin 9 - 12V(negative)
Pin 10- Audio Right
Pin 11- Audio Left
Pin 12- Audio Ground
Pin 13- Mic
Pin 14- Mic Ground
Pin 15- Camera detection (When this one is connected to ground, enables the video camera. I am using it with a relle conected to the reverse light, works perfect)
Pin 29- Video In Ground
Pin 30- Video In
Pin 31- Cradle ID Ground
Pin 32- Cradle ID (With a resistor between this two, you can get:
.38V -> 7,4kohm -> Volvo
.2V -> -> Car (This one is the cradle I have)
.0V -> -> Development (I don t know what this is for)
I still have some noise, but It's much lower since I hooked all grounds together. Maybe I have problems in alternator.
Thanks all again!
PD.I will upload a video to my site ebancora.com.ar
Anybody who did spot a "mute" signal to be output from the navi ?
This would allow to interface directly with car sets that are prepared for phones.
the "mute" signal should go low (connecting to ground) anytime audio is output by the navi, which tells the car set to automatically switch to the phones input no matter what source currently is selected (CD, FM, MP3 ...)
Best
Michael |
| Tom Schmitz |
Posted - 28 oct. 2010 : 18:47:50
PhilHornby-
Thanks for the confirmation and info.
Downgrading (or changing firmware in any direction) is like a box of chocolates. I'm not keen on the idea but may get bold and try it, though the inelegant solution of a neatly done dummy plug is probably more practical. One advantage of paying the $99 for a refurb was that it came with the latest maps, a $99 'value'  , so I'm good on the maps if I choose to downgrade.
Right now I'm having issues with the mod to the cradle. I have a weak channel and what seems like poor channel separation. A continuity check from the pins to the dongle shows that everything is as it should be and there are no DC shorts between any of the three lines.
The alternative is to go with the earphone jack, and that may not be as problematic as it was before. I'm adding an AmpliRider to the system, so the patch cord would go to that and not flap in the breeze so much.
I may go back in and rebuild the mod, adding a thin foil shielding to prevent an AC cross-talk.
This is turning into a science project.
Tom
Update: I went ahead and installed a 2.2K ohm resistor between pin 7 and 8/9 next to the 18 pin connector on the cradle board.
When the cradle is attached, the internal speaker shuts off. The status screen shows a VIB connected.
Not only is the internal audio not muted like it was when the FM transmitter was turned on, it is actually quite a bit stronger than the audio from the earphone jack.
The audio does not respond to the Master Volume setting, but does respond to the Media Volume setting. I also noticed that when the cradle is connected that the Master volume gets reset to 70%. I need to go back and observe that again to be sure.
Tom |
| PhilHornby |
Posted - 28 oct. 2010 : 13:01:44
quote:
Originally posted by Tom Schmitz
When I plug in a dummy plug into the earphone jack it works fine. However, when I activate the FM transmitter the audio level from the cradle drops significantly. It's so low that a Boostaroo barely brings it up to normal levels. Did anyone else experience that?
This seems to be the result of an undocumented, un-asked-for and un-welcome firmware change (in V4.7 or later). Why do Garmin do these things? My 760 was working really well using V4.6 until I 'upgraded'. Like you, I encountered a huge drop in volume from the cradle, when using the 'FM method'. Falling back to V4.6 restored normal operation. I'd gone straight from V4.6 to whatever the latest version is (V4.9?), so I don't know if the problem was introduced with V4.7, or one of the later ones.
Note: on downgrading back to V4.6, I started experiencing hangs, crashes and power-offs. These turned out to be related to the presence of an upgraded voice file that had been installed at the same time as the firmware. Replacing British_English_daniel V1.7 with V1.6 cured the problem.
No doubt some future map upgrade is going to insist on a firmware upgrade and the convenience of being able to just snap the unit into the cradle is going to be lost to me  (and yes, the ability of the 7xx series to actually follow a downloaded route, rather than recalculating it, is a stand-out feature in my book too) |
| Tom Schmitz |
Posted - 28 oct. 2010 : 02:23:50
I know this thread is old and that the Nuvi 750 is obsolete, but I just received my refurb unit back from Garmin. My previous unit was abused to death over the course of 2 years on my motorcycle.
I like the 750 for the upload of routes and the MP3 player. Just the ticket for what I need on my bike.
My old unit dropped a channel in the audio out due to the constant tension and flapping of the patch cord that ran to my helmet. I also had issues with the ability of a computer to recognize the unit. That seemed to stem from too many Favorites, but it also seemed corrupted.
Based upon that experience, I'm leery of using the earphone socket and of using the mini-usb to power the unit, as the constant plugging and unplugging is abusive to the only port that allows data access. I'll be converting to the cradle plug for power.
I’m trying to set up this new unit to avoid the problems I encountered with the last one.
So far I have modified the cradle to give me an audio-out dongle. When I plug in a dummy plug into the earphone jack it works fine. However, when I activate the FM transmitter the audio level from the cradle drops significantly. It's so low that a Boostaroo barely brings it up to normal levels. Did anyone else experience that?
On page 14 of this thread vfrman said that connecting a 2.2K resistor to pin 7 and 8/9 will shut the external speaker off, obviating the need for a dummy plug. My question is whether or not it also attenuates the audio on the cradle in the same way that the FM transmitter does.
Obviously, I could try it and see, but I thought I would ask as soldering on these things is a bit nerve-wracking and can do as much harm as good.
Thanks for any help on this,
Tom
|
| JimD |
Posted - 14 oct. 2010 : 19:55:12
The regular power cord is a lot cheaper than a GTM-20 but you don't have traffic information. It would not be worth paying for a GTM-20 unless you have the traffic subscription or intend to get it. The regular power cord seems cheap enough it would not be worth trying to repair the old one.
Jim |
| ST-Bob |
Posted - 01 oct. 2010 : 02:18:19
So it's possible that it won't charge at all through USB then... I'd spring for either a new GTM-20 or a regular power cord. |
| alandb |
Posted - 01 oct. 2010 : 02:13:09
The other thing you need to consider is that you are replacing an active cradle power with USB power that plugs directly into the unit. Most Garmin models that use an active cradle will not give full screen brightness when powered by USB. This is definitely the case on my 755T. It is simply too dim to use for daylight navigation when powered by USB |
| ST-Bob |
Posted - 30 sept. 2010 : 21:24:35
Nope, not that I know of. The mini-USB 5-pin plugs are usually molded and not able to be taken apart. I would not do this inside the unit or it will never go into USB storage device mode. |
| spystyle |
Posted - 30 sept. 2010 : 20:58:03
Can someone illustrate how to do this ?
pin X & 4 connected through 18kOhm resistor - Garmin supply 1A, possible navigation.
Does that mean I solder a wire to pin x, then a wire connecting that to a resistor, then a wire connecting that to pin 4 ? |
| ST-Bob |
Posted - 30 sept. 2010 : 19:50:55
If you can get to the back of the plug then yes. Otherwise buy the genuine Garmin power cord. |
| spystyle |
Posted - 30 sept. 2010 : 19:39:14
Hi there :)
I need some help :)
My friend has a Garmin GPS and it uses "GTM 20" plug
That plug's tip was messed up so I ordered some chargers for him on eBay, cheap USB ones :)
The problem! When he plus the new usb charger cord in he can't navigate.
So I used Google to find this :)
http://pinouts.ru/GPS/garmin_nuvi_power_pinout.shtml
Please define this :
pin X & 4 connected through 18kOhm resistor - Garmin supply 1A, possible navigation.
Does that mean I need to solder a wire that connects "pin X" to "18k ohm resistor" to "pin 4" ?
Thanks,
Craig
|
| LawnGuyLander |
Posted - 18 sept. 2010 : 17:44:49
I see this thread has not been terribly active lately. I stumbled across it looking for the part number of the GTM 20 plug. I have the older style GTM 20, with LED's, and the strain relief broke through the back of the Hirose ST40X-18S-CV(80) connector shell. I am looking for a new plug shell without the plug itself, if such a configuration is available. I see only Mouser and Digi-Key sell the complete connectors and Digi-Key has the ominous "Call" in the availability. Can anyone recommend a good low-cost source for the plug and/or shell or does anyone who was doing the earlier hacking have leftover pieces from a plug? |
| neilp1 |
Posted - 12 août 2010 : 20:33:37
quote:
Originally posted by edub80
It been a long time!! thanks to all! I have my nuvi855 connected to my car, with audio out enabled throught the cradle, no audio from internal speaker (no dummy plug) and rear view camera connected when I use the reverse gear.
i would love to learn how you did this, exactly. I tried your site but i cant find the information. I really like the back-up camera modification. If you can, could you explain what you did. What pins to connect in which cradle etc. IOf you have pictures of what the unit looks like after the modification that would be cool. I have the Garmin nuvi 855T.
Thanks for any info. |
| edub80 |
Posted - 04 juil. 2010 : 23:54:09
It been a long time!! thanks to all! I have my nuvi855 connected to my car, with audio out enabled throught the cradle, no audio from internal speaker (no dummy plug) and rear view camera connected when I use the reverse gear.
These are the pinouts a discover, they are all from the craddle, you have to route them to the hirose:
I will upload a video to show you how its working.
Pin 1 -12V
Pin 2 -12V
Pin 3 -DeviceID GND
Pin 4 -DeviceID
With a resistance connected between this two you can have:
8,1 kohm ->Garmin Serial Cable Slave
3,6 kohm ->Garmin Serial Cable Master
15,4 kohm ->Power Cable
2,15 kohm ->Vib (I'm using this one)
Pin 8 - 12V(negative)
Pin 9 - 12V(negative)
Pin 10- Audio Right
Pin 11- Audio Left
Pin 12- Audio Ground
Pin 13- Mic
Pin 14- Mic Ground
Pin 15- Camera detection (When this one is connected to ground, enables the video camera. I am using it with a relle conected to the reverse light, works perfect)
Pin 29- Video In Ground
Pin 30- Video In
Pin 31- Cradle ID Ground
Pin 32- Cradle ID (With a resistor between this two, you can get:
.38V -> 7,4kohm -> Volvo
.2V -> -> Car (This one is the cradle I have)
.0V -> -> Development (I don t know what this is for)
I still have some noise, but It's much lower since I hooked all grounds together. Maybe I have problems in alternator.
Thanks all again!
PD.I will upload a video to my site ebancora.com.ar
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