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Hummer H2For those who like a little more gleam to their Hummer, the H2 offers a similar rugged look as the H1, but as a lower cost, and with more added features, making it almost a massive luxury SUV.
TBH never really considered, or got into, the odometer topic for various reasons, however I did consider reverse engineering the IPC mainly to address some of the many reliability issues people had with it. If I could get my hands on an old one I would, ditto for the BCM (scrap parts not easy to acquire in the UK)
There's so many items of interest in the Hummer, many involving electronics, mechanics and software, the latter being one I've yet to touch on. Pretty much deal with components as they are encountered, for example :-
Boring for many, but challenging nonetheless, it's all aimed at understanding the issues and helping folks keep their stuff going.
Coming back to the odometer, having now seen the work out there, no doubt one could to write a utility (Python maybe) to read/set the mileage plus any other parameters, there must be people who do this.......
I can see it may pose a legal question after upgrading unless zero miles was the new staring point, not sure if physically transferring the original EEPROM would get around this, it's not really my area.
After much thought I figured the best course of action on the odometer is adding it manually and having the owner send me video of proof so I can save for my records. This way if I'm contacted by someone verifying information I have video proof of mileage. However, who's to say that is the cluster with correct mileage when video is created. Too many problems for one parameter
Yes many issues, however necessity, being the mother of invention, will no doubt yield a solution.
Perhaps a transference method maybe, e.g. plug the new console into the OBD2 port, then hit "copy" to transfer all current settings including mileage
It would need an OBD2 connector link-up, but it would mean the new H2 Digital Cluster could be trialed and tested before full install running in some kind of mirror mode?
Petretti much how a TECH2 works and even the little ELM devices....
Yes many issues, however necessity, being the mother of invention, will no doubt yield a solution.
Perhaps a transference method maybe, e.g. plug the new console into the OBD2 port, then hit "copy" to transfer all current settings including mileage
It would need an OBD2 connector link-up, but it would mean the new H2 Digital Cluster could be trialed and tested before full install running in some kind of mirror mode?
Petretti much how a TECH2 works and even the little ELM devices....
Yes, I'll have to figure out how to extract the mileage possibly create an app to extract current information and port into new display. Right now I'm working on getting the display and functionality in place. Searching Molex connectors for plug and play. Making it an easy swap display.
From a legal point of view, as far as I am aware as long as the replacement cluster displays and tracks mileage correct there is no legal issue with replacing it. One could even drive it a few miles without a cluster and it would realistically still be valid even though a few miles were not recorded. This is due to the way mileage is tracked. Just changing to a larger tires size without programming the new tire size into the PCM will technically make the recorded mileage no longer valid. A LOT of people put on larger tires like 37 or even larger. Of course when this is done the speedometer is no longer reporting the correct speed and mileage is no longer tracked accurately. On many GM vehicles, using a Tech2 you can change the installed tire size from a pre-defined list of valid sizes for the vehicle which corrects this. Often times there are no other listed valid sizes though and often the size you want to install might not be listed. For that I have an EFILive which lets me correct it to whatever size you want.
Another many are not aware of but when you program the correct tire size in the PCM it does more than just correct the speedometer and odometer accuracy. It also adjusts the shift points and pressures in the transmission to better deal with the different size tires and actually will shift better.
This tracked mileage also varies a bit even with stock tires as when they wear they get smaller in diameter. This wear discrepancy is commonly known in the industry but no so much with the public but it is small enough to not be considered an issue.
GM also provided a template in the eSI system for printing a decal to be placed in a door jamb if the odometer has been replaced without reprogramming (or just to note that it has been replaced and correctly programmed). In any case I'd personally think that it would be acceptable if a replacement is within say 25 miles to consider it to still be valid. Where it becomes illegal is when you are dramatically altering the displayed mileage and not disclosing it or doing so the artificially increase resale value.
As a retailer selling clusters or replacement clusters where the mileage is tracked specifically within the cluster it might be prudent to just go ahead and include and odometer disclosure decal for the end buyer and maybe require buyers to fill out (electronic filled out form with a checkbox and way to sign is fine) and affidavit that the buyer is certifying that the mileage they are asking to be programmed is correct. A pic or video is not really good as those are easily altered or just found online. From a legal perspective you are putting the legal end of it upon the buyer by having them provide an affidavit and providing them with a disclosure decal. This is how many of the larger places that specialize in custom clusters and cluster repairs operate.
Please don't forget about us 08 and 09 H2s. Maybe a shift light when we're in manual mode. I'm not sure about what all is the same with these compared to the early ones. How about color modes (light schemes), I'd rather have crazy stuff. Maybe somehow read it off the windshield like newer higher end cars. It would have to be something external mounted on the dash or wherever... I'm gonna stop now and see how much crap is gonna come my way. Thanks. Oh, maybe a theme like Army or Veteran, Combat Vet, fav team... ok, done!
From a legal point of view, as far as I am aware as long as the replacement cluster displays and tracks mileage correct there is no legal issue with replacing it. One could even drive it a few miles without a cluster and it would realistically still be valid even though a few miles were not recorded. This is due to the way mileage is tracked. Just changing to a larger tires size without programming the new tire size into the PCM will technically make the recorded mileage no longer valid. A LOT of people put on larger tires like 37 or even larger. Of course when this is done the speedometer is no longer reporting the correct speed and mileage is no longer tracked accurately. On many GM vehicles, using a Tech2 you can change the installed tire size from a pre-defined list of valid sizes for the vehicle which corrects this. Often times there are no other listed valid sizes though and often the size you want to install might not be listed. For that I have an EFILive which lets me correct it to whatever size you want.
Another many are not aware of but when you program the correct tire size in the PCM it does more than just correct the speedometer and odometer accuracy. It also adjusts the shift points and pressures in the transmission to better deal with the different size tires and actually will shift better.
This tracked mileage also varies a bit even with stock tires as when they wear they get smaller in diameter. This wear discrepancy is commonly known in the industry but no so much with the public but it is small enough to not be considered an issue.
GM also provided a template in the eSI system for printing a decal to be placed in a door jamb if the odometer has been replaced without reprogramming (or just to note that it has been replaced and correctly programmed). In any case I'd personally think that it would be acceptable if a replacement is within say 25 miles to consider it to still be valid. Where it becomes illegal is when you are dramatically altering the displayed mileage and not disclosing it or doing so the artificially increase resale value.
As a retailer selling clusters or replacement clusters where the mileage is tracked specifically within the cluster it might be prudent to just go ahead and include and odometer disclosure decal for the end buyer and maybe require buyers to fill out (electronic filled out form with a checkbox and way to sign is fine) and affidavit that the buyer is certifying that the mileage they are asking to be programmed is correct. A pic or video is not really good as those are easily altered or just found online. From a legal perspective you are putting the legal end of it upon the buyer by having them provide an affidavit and providing them with a disclosure decal. This is how many of the larger places that specialize in custom clusters and cluster repairs operate.
I appreciate your input. It's helped me realize so much more that goes into the hummer platform. Having developed clusters and infotainment systems for vehicle startups, I have to remember the little details for developing and selling a custom cluster for Hummers. Good thing I'm developing this on my own H2. It allows me to find these issues during testing. I reached out to my lawyer about this information and getting legal documentation created when I go to market.
Please don't forget about us 08 and 09 H2s. Maybe a shift light when we're in manual mode. I'm not sure about what all is the same with these compared to the early ones. How about color modes (light schemes), I'd rather have crazy stuff. Maybe somehow read it off the windshield like newer higher end cars. It would have to be something external mounted on the dash or wherever... I'm gonna stop now and see how much crap is gonna come my way. Thanks. Oh, maybe a theme like Army or Veteran, Combat Vet, fav team... ok, done!
Nothing wrong with being different. I put a red background flash as an indicator alert. I guess adding a flash to gear change is not a bad option. I'll add that to the menu section of the display along with theme changes. Military theme would look good on the gauges especially if tailored to branch colors.
Probably would make it considerably more complex from a development standpoint but maybe add a BT chip and create a phone app to allow buyers to customize the appearance with different skins. Someone wants an analog look, sure, digital look no problem. Custom theme builder - "picture a must be formatted as a jpg no larger than xxxx kb and be exactly aaa x bbb pixels in size.
As I mentioned before - developing something like this for the GMT800 platform means it is technically applicable to all GM trucks and SUV's which is a much broader market. The first few years (1999-2002) did use a different electrical system than 2003-2007 models though but both are considered GMT800 platform vehicles. Still a wide market and the 99-07 trucks and SUV's are becoming very desirable for many due to their high reliability, low cost of parts, and ease of modifications.
Last edited by MixManSC; Sep 16, 2022 at 12:15 PM.
