Temp gauge re-code
 

So I was inspired by a "how to" BMWscanner 1.4 link that Overboost provided in a previous thread to try and recode my temp guage. Mucked around a bit last night and wasn't succesful (most of the info is for E46, E39 etc.) but sure looks do-able. I think I just need to use NCS expert dummy or try out the checksum fixer in BMWscanner. Has anyone done this on an E53?

I think Crowz previously posted a how to.

He certainly did - and its a goodie.... :thumbup:

PA Soft 1.4 | Crowz Nest

How can I help? Did you get my how to? Grab some shots of your EEPROM and I'll see if we can find the code in there. Thinking it should be the same lines...

https://xoutpost.com/1121333-post23.html

When I try to write BMW scanner comes up with 5 errors and eeprom doesn't change. I'll try it again but from what I have read either a person has to change to exactly the right values so that checksum remains intact or recalculate the checksum, which supposedly is doable in BMW scanner? Looks like you guys didn't have the checksum issue?

As wrote that last post I just realized that maybe it has something to do with me loading and writing a saved file instead of making the changes directly in the editor live.

Yeah, that's a good document. I wrote it :nanana:

Yes, Ill PM you my number. I can guide you through it.

Thanks! :) I'll give it another try tonight and see how it goes. I would like to get the checksum thing figured out to feel like I understand a little more on whats going on. Did you guys do the speedo too?

No, speedo and heated seat temperatures are fine as they are IMHO. No need for reprogramming the EEPROM there for me. The temp gauge is a must though. A 40 degree Celsius buffer (104F) is still a questionable BMW engineering design. Not sure WTF they were thinking... :dunno:

Just save your original .bin file for safe keeping and just make the changes live. Just click or cursor over to the appropriate hex value and change. Then just write to the EEPROM. No checksum validation needed.

The first hex byte of a line represents the number of data bytes to follow in that line and the last byte is a simple checksum. You aren't changing either of those.