Yep - something like that. On mine I used the Metra ASWC-1.

Here are some docs from the GM eSI system that you might find helpful.... Description and schematics for the clusters.

 

Thanks for the docs. I have most of the information already. Getting closer to a completed prototype. Stay tuned for video of display in action!

 

I have a Kenwood Excelon 10.1" display with steering wheel controls. It's pretty awesome. I can read and even clear codes. I can change modes and it will read rpms, Temps, tire pressures, braking ft, 0-60, intake temp, 1/4 mile time, fuel, % of load on the engine, tells the ignition position, tells battery voltage, etc. It has HDMI, USB, ETC. You get the point. It has steering wheel controls, sold separately, and works with the stock amps and everything. Lol, I love this thing. Not sure how it would affect your build, but I could probably use it instead of the phone for some things.

 

You have an 08 or 09 and have the iDatalink Maestro interface module.... That does not work on the 03-07 models which use a totally different electrical system.

That being said iDatalink could make one for the GMT800 platform electrical system but they do not think the market is big enough to make it worth their time. I have used Kenwood DNX stereos for years that have the Maestro connector... I actually contacted them (iDatalink) about it and asked a number of year back and that was their response. Its pretty much software but the actual communications chip in the module would also have to be different as the Maestro units all use the CAN bus for control while the older GMT800 platform does not have a CAN bus and only uses the Class 2 GM data (or possibly some GMLAN) which does have the 2 way ability to use a lot of those features (that is how other OBDII tools work on them). I've always wanted to have that working on my Kenwood but have to use other tools like the Torque app for that sort of thing on my phone instead.

 

Lol, way outta my league with most of this. I'm not sure what all is different between the earlier ones and the 08-09s. I'm just glad it works! Thanks.

 

Totally different electrical systems, different engine and transmission, different interior, and a few other bits. Externally they look basically the same but otherwise very different between the two generations.

 

Yea, I know the dash, engine, transmission, drive train electronics and stuff like that. It's terrible about the transmissions always going bad.

 

Everyone has their own preference. I have a iOS application (https://apps.apple.com/us/app/multid...d/id1436306300) I can place on an iPad to read/clear DTC's plus vehicle data which would cost far less just creating that software. I have an idea for an updated center stack screen using an iPad 10.2 inch connected to hardware I've been working on since 2021 to control all aspects of a vehicle.

 

GM went to the high speed CANBUS in 2008, the prior Hummer used the old style bus. This is also why you can only use the older LBZ/7 versions of the Duramax put into the pre 08 Hummers.

The 08/09 can be retrofitted with any of the newer Duramax's like the LMM, LML and L5P because their ECM's also use the high speed canbus and can be interfaced.

Along with the good comes a little bad, the newer bus makes the new Hummers more complicated and difficult to work on as well. Just about everything in the truck talks to the computers. Not only do you need a Tech II but also an MDI-2 and a laptop running TIS-2000 software to service and program all the systems.

 

So with an 08 a can move up in the line of diesel engines if I want. Thats so cool then . As far as the iPad or another pad, that seems like a pretty good deal then.