Corvette CCM Reverse Engineering Anyone?

[-=Jeff=-]

Getting a dump from your LT5 CCMs would be phenomenal, as would if any of your 4 CCMs were from cars that originally had C60 climate control (manual). I know you have a C60 unit installed in your car right now, but I'm guessing it didn't actually come that way from the factory.

Actually, 1990 is the only year to Offer C60 with the ZR-1 and C68 was an option. My 1990 is one of the rare C60 ZR-1s ( less than 200 ordered that way)

To dump the CCM, you'll need to plug a laptop into your ALDL port and use steveo's flashhack software. It's available here: https://ecmhack.com/flashhack/#Downloads

EDIT: just read this again, so it is on the same serial lines as the ecm, I can do this tonight hopefully, I can also get a 1992 CCM dump from a friend's ZR-1 at some point, it this is easy and no harm done on a dump, I might b able to get 1991-1995.. but no promises

When you run the program you'll be greeted with a selection window. Choose "ALDL Universal Read" and then click "Run." Then go to Parameters tab -> Device ID and change the value from f4 to f1. Then go back to the Operations tab and click Read Calibration. This will download the entire CCM. You can then save the BIN and toss it up as a forum attachment.

Nice, sounds easy enough.. How do I attach to the CCM for a Dump.. the other 3 are on the workbench

NomakeWan I see you added an eeprom car to your collection - cool! Anyway, thanks for helping -=Jeff=- get started dumping memory.

Jeff - it's been a while and I've moved on to other projects so I might be slow to respond but will do everything I can to help. When you get the memory dumped post them up along with everything you know about them except the mileage as I'd like to verify my assumptions without bias of knowing ahead of time.

I am not sure I know the exact mileage of each but know options

I've definitely been able to reprogram the '95 CCM. I currently have a '94 along with the harness side connectors thanks to AngryCorvair but have yet to take the time to re-assemble my test bench to dump it's memory. Having the memory dumps from yours will be very beneficial for owners of eeprom based cars (93 and older LT1s, all ZR-1s).

Disclaimer - you will have to open the unit up and short the reman pin to ground to be able to unlock the CCM, but I'm sure NomakeWan mentioned this. I'm sure you also know that getting them out of the car is no picnic.

I cleared up some space in my inbox so PM is now available again.

I have removed the CCM before.. it is not too bad (disclaimer.. my last C4 was an 89 in which I swapped to a 1991 full interior with working CCM)

What I would like is the digital data on the 92-96 LCD display, the 90-91 did not have it, but I know the wiring I need to change to allow the use of the 1992 CCM and 1992 PROM in the ECM to allow these features. so I really would like to switch form LT1 to LT5, I have a friend with a 1994, had a bad CCM and it was replaced before he bought it, but it was from an LT1 car, an I would like to help him by fixing that bit.

I would also like to correct the mileage of the 1992 CCM to match that of my 1990 when I do the switch, but that may not be an option