2007 Yukon Denali DVD/NAV Operation While Driving

[Perk]

I have had my 07 Denali for about 2 months now, and after taking my first road trip I have identified the first mod that I'd like to perform on the truck.

 

I can understand why GMC does not want the DVD player to work while you are driving, but for those of us that are responsible enough to know that you can't watch TV and drive, I think it should be possible for our front seat passenger to watch it. Also, should be the same for NAV operation. My passenger should be able to input an address or look up a POI while we are in motion. At least, thats what I would like to have.

 

I searched around here and did not find anything for the new 2007s. I did read about the VSS (vehicle speed sensor) wire on the older models. Can anyone help me out. I am pretty sure there is more to it now, as soon as you shift the transmission out of park, the DVD cannot be viewed on the NAV screen (does not appear to be speed related). The NAV operation does appear to be locked out by the vehicle speed.

 

--Chris

[Rodger]

Yes, I agree that it is not simply a matter of dealing with the vss wire. GM has its own LAN, which sends signals to the various devices on the vehicle. This makes fooling the NAV system into thinking it is still in park infinitely more difficult. My concern is that any complex modification will invalidate the warranty. I, like you, hope that someone will find a simple solution, but I don't hold out much hope for a near term solution that does not involve an extensive mod to the NAV System.

 

Rodger

[duramaxHD]

I explained about this same question a couple threads back...

 

ben

[Perk]

I explained about this same question a couple threads back...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

Ben,

Thanks for responding. I am new to this forum, but not really new to forums. So I did spend a lot of time researching this here before posting the question. But just didn't find the answer. Did I miss a thread? I read a good one of yours about GMLan which is new, it replaced the old T2...I'm probobly repeating it incorrectly.

 

Did I miss some information you put out that could help me get this working? Sure wish I had some technical information on the UVB NAV radio(schematics etc) I am an electrical Engineer and I mostly write code for HW interface (control systems) using assembly language...and some higher level stuff in Unix. I'd like to contribute if I can.

 

Anyway, thanks for your posts, I appreciate you taking the time to share your information.

 

--Chris

[duramaxHD]

I explained about this same question a couple threads back...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

Ben,

Thanks for responding. I am new to this forum, but not really new to forums. So I did spend a lot of time researching this here before posting the question. But just didn't find the answer. Did I miss a thread? I read a good one of yours about GMLan which is new, it replaced the old T2...I'm probobly repeating it incorrectly.

 

Did I miss some information you put out that could help me get this working? Sure wish I had some technical information on the UVB NAV radio(schematics etc) I am an electrical Engineer and I mostly write code for HW interface (control systems) using assembly language...and some higher level stuff in Unix. I'd like to contribute if I can.

 

Anyway, thanks for your posts, I appreciate you taking the time to share your information.

 

--Chris

 

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Hey Chris-- sorry buddy I didnt mean to come off like an @$$

 

Heres the other thread: http://www.gm-trucks.com/forums/index.php?showtopic=51930

 

basically, its on the software/firmware level of the nav unit. Id be happy to send you the wiring pinouts for the connectors of the -900 nav units, but as far as "inside" stuff Im not sure. I really want one to dig around in, see what kind of MPEG decoders it has, what kind of AC3 (it even supports DTS audio!!) decoders it has, etc... You'd have to somehow read out the entire firmware/operating system flash, then sort thru the code to where it does the VSS checksum, or the line where it says to disable video when VSS pulses are detected. Actually I think its based on NSBU (neutral safety backup switch, basically the transmissiotn position switch) info, not Vehicle speed sensor data. When it gets a GMLAN signal that the trans is in reverse or drive, it cuts the video playback. Im not an electrical engineer by any means, but it sounds like it would be pretty complicated, not only figuring out low speed GMLAN (a wacky proprietory form of SWCAN, single wire CAN) bus, but also figuring out Denso's (nav units no longer made by delphi) software too.....but man if you figured it out, you'd make a fortune!!

 

low speed GMLAN replaced Class II (SAE-J1850VPW) for body control/chassis communication on the new GMT-900's. The GMT-800's used Class II for body/chassis control, and J1939/CAN for ECM-TCM communication. The new GMT-900's use high speed GMLAN (similar in theory/operation to J1939, but operates at 500kb/sec as opposed to J1939 250kb/sec) for ECM-TCM communication.

 

hope that helps

 

Ben

[Perk]

Ben,

Don't worry, you didn't come off that way at all. I appreciate your help. You obviously have a lot of knowledge to share. I'm switching over my ISP to a wireless service tonight, and I won't have an email address until tomorrow morning. I'll forward it to you as soon as I get it so I can take a look at what you've got. It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

Thanks again,

--Chris

 

PS Not an engineer uh...from the reading that I have done on here in the past two days it sounds like your just not a card carrying engineer yet.

[duramaxHD]

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

[domoftvandnav2go]

Hi

The mod can be done plug and play behind the radio. It is DIY. We have the video in motion interfaces for this car. ****NON SUPPORTING VENDOR****

 

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

[toneman]

Hi

  The mod can be done plug and play behind the radio. It is DIY. We have the video in motion interfaces for this car. ****NON SUPPORTING VENDOR****

 

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

The mod that this guy is talking about is for sending a video feed to the screen; it isn't a hack to get the factory DVD screen to play while not in park. IOW--it's essentially the same type of module that's available for the last-gen GM nav units...but engineered for 2007 nav units.

 

My comment is based on info I read from what I take is that guy's website (based on his ID); if not, then I apologize for the info contained in this post.

[domoftvandnav2go]

Hi toneman

Hope all is well.

Sorry, but that is NOT correct our mod is to let the DVD player play while the car is in drive (IE video in motion GMC mod). We also have a mod to add backup camera if you like.

Thanks Dominic

 

Hi

  The mod can be done plug and play behind the radio. It is DIY. We have the video in motion interfaces for this car. ****NON SUPPORTING VENDOR****

 

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

The mod that this guy is talking about is for sending a video feed to the screen; it isn't a hack to get the factory DVD screen to play while not in park. IOW--it's essentially the same type of module that's available for the last-gen GM nav units...but engineered for 2007 nav units.

 

My comment is based on info I read from what I take is that guy's website (based on his ID); if not, then I apologize for the info contained in this post.

 

<{POST_SNAPBACK}>

 

 

 

[toneman]

Hi toneman

    Hope all is well.

Sorry, but that is NOT correct our mod is to let the DVD player play while the car is in drive (IE video in motion GMC mod). We also have a mod to add backup camera if you like. 

Thanks Dominic

 

Hi

  The mod can be done plug and play behind the radio. It is DIY. We have the video in motion interfaces for this car. ****NON SUPPORTING VENDOR****

 

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

The mod that this guy is talking about is for sending a video feed to the screen; it isn't a hack to get the factory DVD screen to play while not in park. IOW--it's essentially the same type of module that's available for the last-gen GM nav units...but engineered for 2007 nav units.

 

My comment is based on info I read from what I take is that guy's website (based on his ID); if not, then I apologize for the info contained in this post.

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

Are you talking about the built-in factory DVD player, or an add-on DVD player that's connected to your mod?

 

FWIW--I dunno if your screen name (minus the "domof" part) is the same as the website, but assuming that there isn't more than one site w/ that same name, I went to it and couldn't find anything that explicitly mentions that mod for 2007 GM nav units--it only mentions the mod part number for the non-touchscreen and pre-2007 touchscreen navs.

[domoftvandnav2go]

Hi toneman

Hope all is well.

The web site hasn't been updated yet.

We have 2 different mods for the new GMC trucks.

1) The first is video in motion only. This will allow your factory dvd player to play while in motion. This is plug and play and takes 5min to install.

2) The 2nd mod is to add an external video sources like xbox, ps2, camera, video ipod etc. For this mod the radio must be sent in to us.

If the owner of this board has a GMC truck and puts up a banner for my company I will send them a video in motion adapter FREE of charge to prove that the unit works 100%.

Thanks Dominic

 

Hi toneman

    Hope all is well.

Sorry, but that is NOT correct our mod is to let the DVD player play while the car is in drive (IE video in motion GMC mod). We also have a mod to add backup camera if you like. 

Thanks Dominic

 

Hi

  The mod can be done plug and play behind the radio. It is DIY. We have the video in motion interfaces for this car. ****NON SUPPORTING VENDOR****

 

It already sounds like we need a "diagnostic hack" as opposed to a hardware mod.

 

yeah, nothing physical would have to be done, just the firmware would have to be hacked. The nav units get programmed thru the GMLAN bus, so you would probably also have to somehow listen in on that...but then again there might be some way inside the nav unit to directly read out the PROM chip that has the firmware/BIOS/whatever else on it....

 

to program the GMT-800 (2003=2006 TNR's) nav units, all you need I think is a VCI box for your computer to translate the Class II into binary/hex so you can read it out and send the nav unit commands. I would have no idea where to go from there tho...

 

ben

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

The mod that this guy is talking about is for sending a video feed to the screen; it isn't a hack to get the factory DVD screen to play while not in park. IOW--it's essentially the same type of module that's available for the last-gen GM nav units...but engineered for 2007 nav units.

 

My comment is based on info I read from what I take is that guy's website (based on his ID); if not, then I apologize for the info contained in this post.

 

<{POST_SNAPBACK}>

 

 

 

 

<{POST_SNAPBACK}>

 

 

 

 

Are you talking about the built-in factory DVD player, or an add-on DVD player that's connected to your mod?

 

FWIW--I dunno if your screen name (minus the "domof" part) is the same as the website, but assuming that there isn't more than one site w/ that same name, I went to it and couldn't find anything that explicitly mentions that mod for 2007 GM nav units--it only mentions the mod part number for the non-touchscreen and pre-2007 touchscreen navs.

 

<{POST_SNAPBACK}>

 

 

 

[Perk]

nav2go -

I checked out coastaletech website and he has a plug-n-play hack for my 2007 Yukon Denali. His website has a demo video for a 2007 Tahoe and his hack looks sweet. Hit the voice recognition button 4x and it enables video while in drive. He claims that it installs in 5 minutes "plug and play". Downside is $220. In all fairness, I have not seen his hardware, so $220 may be a bargain when you consider his time and expertise. Bottom line is this: How much is your hack/override, and how easy is it to install.

 

I am ready to throw down the cash, the only thing holding me back is the fear that I will pay $220 for a mod that will eventually cost $100. So I am curious what you are asking for your overrirde, and if it is similiar to coastaldaves.

 

I am ready to pay $150 for a setup like coastaletech....question is, how long do I have to wait for the price to come down? Cut me a break on the price and I will be the first to prop your product on this, and any other forum where I see someone lurking for a hack.

 

--Perk

[KeithGP]

I am ready to throw down the cash, the only thing holding me back is the fear that I will pay $220 for a mod that will eventually cost $100.

 

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I'm with Perk on this one. I would love to try it as wll and give feedback to more people, but $220 seems a little high. I would hate to see it on eBay for $49.95 next week.

 

Perk, let us know if you get one and it works as planned.

 

domoftvandnav2go - can this mod ever malfunction? What is the warranty on it? I would hate for it to break a couple of years down the line and have no way to replace it.

[KOYukon07]

Does this unit make the Navigation Unit functional while the car is in motion? Does anyone have a mod for that??

 

 

 

 

 

I am ready to throw down the cash, the only thing holding me back is the fear that I will pay $220 for a mod that will eventually cost $100.

 

<{POST_SNAPBACK}>

 

 

 

I'm with Perk on this one. I would love to try it as wll and give feedback to more people, but $220 seems a little high. I would hate to see it on eBay for $49.95 next week.

 

Perk, let us know if you get one and it works as planned.

 

domoftvandnav2go - can this mod ever malfunction? What is the warranty on it? I would hate for it to break a couple of years down the line and have no way to replace it.

 

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