I'm in!! Take my money!!

 

The Body Control Module eeprom is storing the mileage? I'll have to contact someone tomorrow to verify this. Don't think I'm discounting you I just need verification.

 

mileage is stored in the cluster i had to transfer my original eeprom to the replacement chevy taho cluster board to transfer my mileage. it does check somewhere else to compare if the data match's.

 

Thanks for the information. I'll spend some time today contacting some shops that work on these vehicles along with the dealerships. I found a pdf on the h2's wiring and hardware.

 

The main eeprom for mileage is indeed in the cluster. Just to the lower right corner of the PRNDL VFD. My understanding is that it is reported to the BCM by the cluster but only as a static copy of the current - in other words what the BCM shows will only get updated by the cluster.

 

Your conceptual design looks fantastic, pitch, roll, yaw and back-up camera would be great too!

Once you have a LCD panel with Serial Comms , the world opens-up, for example adding DTC libraries, even if only for the basic stuff or just the codes with the ability to clear them.

This is diagram for an 04' Instrument Cluster, heavily annotated but quite hi-res.

I'm no expert, but it looks like the 12-Way connector brings in all the key controls, some functions appear to handled by discrete logic, others by Serial Comms.

As well as the eeprom as MixManSC and bronxteck discussed, these are some of the functions that would need replicating for a plug-and-play solution:-

• Mal Function Indicator and it's functions (Check Engine Light)
• Serial Class-2 software layers, for example the circuit diagram shows the following sub-functions, there other system functions such as Steering Switches, DIC messages, Languages, Options for example:-
  • PRND321 display
  • Fuel Level
  • Battery Volts
  • Tachometer
  • Speedometer
  • Transmission Fluid Temp
  • Engine Oil Pressure
  • Engine Mileage eeprom (as mentioned)

Hard wired logic functions:-

• Washer Fluid Low detection
• Lighting/Dimming Controls
• Steering Controls - Left & Right Selector Switches (Trip, Fuel, Personalization, etc)
• Left & Right Turn Indicators

The ABS, Traction Control, Airbag, Battery, Tow/Haul, Low Fuel, Cruise Control, Brake, Seat Beldt, Security, High Beam also are handled by Serial Class2.

Been trying to get my hands on an old/scrap cluster for some time to reverse engineer as it's a component that seems to have a lot of questions/issues.

As for the Serial Comms I've yet to explore that universe 😀

 

That looks awesome, I will want to buy one once this is all said and done… I think you have covered all the bases on the gauges though, look forward to seeing the progress!

 

Thanks for the diagram and information. I spent much of yesterday finding wiring diagrams and testing can bus signals/information. Searched for Automotive grade components like rear view camera, infrared cameras, wire connectors, pcb connectors, etc. So far the biggest hurdle is the Odometer. Once I can get that figured out properly everything else will move along smoothly.

I also noticed the cluster is different for 2007-2009 H2's. However, data/signals should be the same.

 

Thank you. I will post more as it progresses.

 

Update: Spoke with Paul from Predator Inc. Seems the odometer reading is the issue on the H2's. They have to send out the clusters to get reprogrammed. Still reaching out to other companies for more info. Looks like I need to address this issue or maybe thats why other companies have given up cause they couldn't. Either way I'll have a solution just might need to be manually input and saved by the end user into the new Digital cluster.