OK...the new nav unit is here, but it is theftlocked. good news is that my door dings, parking sensor dings, and turn signals work with this model (GM 25846421)!!!! I tested out the camera (Kenwood CMOS 200) on the old unit and it works as described above.

I will be getting the new nav unit programmed tomorrow and following up one final time with photos.

 

NEW NAV RADIO WORKS PERFECTLY (GM 25846421) door dings, signals and all!!!!! pics to follow...

 

Awesome news! I just updated my notepad of part numbers and documents to reflect the new p/n and a note beside it saying it worked perfect in a 2007 LTZ Tahoe. Looks like that the p/n for me then! Thanks for being the guinea pig!

 

Note: I have an 07 with lt3 with Bose and res, but not ltz or y91!

 

Hmmmm. Well I have the 2007 LTZ w/ Bose, RES and NO Y91. That "HAS" to be close enough! Lol.

 

Ok, I'm going nuts.

I have installed the new VCIM & XM unit. They work great (except the OnStar programming hasn't been done yet).

I have found out, according to the dealership, that I do not have an amp, Y91. However, from what I have read the nav unit should still turn on it would just be quieter. That is not what is happening in this instance. The nav unit isn't showing theft-lock and won't respond to input on the buttons. It just shows the time.

The dealership says the nav unit, p/n #20883054, has been programmed with my vin, but was from a GMC Acadia (how would they know this? I bought it off eBay from someone who said it was new and never provided the dealership with a VIN, I don't know what vehicle it came out of). Furthermore, they say that it is programed for the middle-east and cannot be reprogrammed for my vehicle because the options aren't available in the Tech-II?

HELP PLEASE.

 

Did you get a nav unit compatible with Y91 or not? Are the LEDs on the front RED (GMC ACADIA is the only version that has RED). They can also tell where it came from by the info programmed in the radio. There was a guy on ebay that was selling like 10 of these (Schram I think). The buttons don't work because the radio isn't programmed properly (this also occured with my radio). Region is selected in TIS programming. It doesn't matter what the TECH II says, the PC is used for programming, TECH II is only for reading the car.

If I were you, I would go and ask what nav radio is compatible with my car specifically. Send the radio back to the guy on ebay and search ebay for your compatible part number. I had much success with this.

 

He wouldn't have gotten PN 20883054 from me, I don't have that PN. It doesn't decode for me either, so I can't help you out with what its out of.

I've done a ton of research with getting various nav units into various vehicles over the past few months and figured I'd jump in with some suggestions for you guys.

1. Your nav will require programing. Some sellers do it before they sell it to you, but most can't (it takes equipment the average person, or even a place like us, just doesn't have access to.) It shouldn't cost you more than $75.
2. In the GMT900 / Lambda Platform vehicles, Bose / Non Bose Y91 doesn't matter one bit. It can all be taken care of with programing. If you don't believe me on this, just search this forum or some of the other big GM vehicle forums if you need confirmation, I've been doing my best to dispell this idea. It takes a little outside of the box thinking. Your vehicle didn't come with NAV, so when the dealer uses your VIN to open up the programming options, it will not bring up the proper options. You need to get a loaded VIN for your particular make (VERY IMPORTANT) and find a dealer that will use that vin to pull up the programming options. (NOT to unlock the unit, which they very likely won't do and for good reason) Then they need to go through and carefully reprogram the unit based on the options specific to your vehicle.
3. Because of this, I recomend this very important step. CALL AROUND. Do not just take it to your favorite dealer. They may be great people. They may have sold you a great car, and you may be a life long fan. This doesn't mean their tech knows how to do this install. To save yourself time and headache, call around and ask them the question "Hi, I want to upgrade my non-navigation (vehicle) to a OEM navigiation unit. Do you have a tech who has done this before?" if the answer is no, call the next place.
4. If the programming is done and you still have loud chimes and turn signals (or no chimes and no turn signals) the install was done wrong. Even if the tech INSISTS he did it correctly, he didn't.
5. Bluetooth is NOT controlled by the NAV. It's in the VCIM. I'm sure most of you guys know this, but I figure I'd include it in the post. If you didn't have bluetooth before you installed your OEM nav unit, you won't have it after. Some aftermarket units may control the bluetooth, the OEM head unit does not.
6. If you have backup camera in your mirror, the backup camera on the head unit will not work. (I have not indepently confirmed this like I have the above points, but I've read enough to convince me until I see it for myself)

If you bought a unit and are having trouble getting the install done, even if you didn't buy it from me, shoot me an email at srespecki@schramauto.com and I'll try to help you through it.

 

so what about z71 its like LTZ

 

Haven't ever heard of a problem in a Z71.