file.newsgroup.cars.102878 Maven / Gradle / Ivy
From: [email protected] (Aaron Lung)
Subject: Re: electronic odometers (was: Used BMW Question ..... ???)
In article <[email protected]> [email protected] (Daniel L. Lovall) writes:
>
>It shouldn't be THAT hard if you know much about digital electronics. If the
>counter is made with standard TTL chips, all you should need to do is find
>the chip(s) used for counting, figure out what mileage you want to put in,
>and preset it but wiring the preset pins directly to low/high (you'd also have
>to know what the conventions are for low and high). It might be a little more
>involved than this, but it shouldn't be beyond someone with a BSEE or BS EET.
>All the display does is convert what the counter chips say into digits using
>a "translation table" stored in ROM.
>
Nobody is using discrete IC's to do these functions anymore if at
all. I doubt any of the Motor electronics had any to start with.
...Much less TTL.
I can almost guarantee that it'll a fruitless attempt to figure out
how BMW does it without breaking anything and invalidating any
warranty on the car. If you're lucky, you'd still be able to
start the car.