TACH-cluster replacement-resetting ODO?

[CTScott]

As a side note, a while back nickhjort sent me some pics from when we were trying to figure out if we could get the 07-08 clusters to drive cruise control lights.

Looking back though the pics recently I realized that the cluster has a "core" module with the microcontroller on it, which is plugged into a "carrier" board (i.e. the big circuit board with the lights and speedo). The mileage on the cluster end is stored in flash memory within this microcontroller. If the cold boot via battery disconnect doesn't work, It may be possible to move the core over from the old to new cluster. The question is if the microcontroller is programmed generically and it drives whatever is available on the carrier it is plugged into, or if it is programmed specifically for the carrier.

Speed Core.jpg

[walterokus]

Originally Posted by CTScott

As a side note, a while back nickhjort sent me some pics from when we were trying to figure out if we could get the 07-08 clusters to drive cruise control lights.

Looking back though the pics recently I realized that the cluster has a "core" module with the microcontroller on it, which is plugged into a "carrier" board (i.e. the big circuit board with the lights and speedo). The mileage on the cluster end is stored in flash memory within this microcontroller. If the cold boot via battery disconnect doesn't work, It may be possible to move the core over from the old to new cluster. The question is if the microcontroller is programmed generically and it drives whatever is available on the carrier it is plugged into, or if it is programmed specifically for the carrier.

Attachment 27136

Hi mi name eis walter and from Santiago de Chile South Americas
I change my yaris cluster 2007 is changed by a cluster of yaris 2009.
cluster 07 years' -> http://i29.tinypic.com/2uz8bcx.jpg
cluster 09 years' -> http://i25.tinypic.com/144cqyq.jpg

cluster 09 'works great on the yaris 07'
http://i27.tinypic.com/2uz9lza.jpg

my cluster 07 'with the ODO = 18,500 km, and the cluster 09' is ODO = 5500 km,

if I change the cards that control the ODO, the card 07 in the replacement cluster 09, I left my true mileage?

[jdms]

Originally Posted by CTScott

As a side note, a while back nickhjort sent me some pics from when we were trying to figure out if we could get the 07-08 clusters to drive cruise control lights.

Looking back though the pics recently I realized that the cluster has a "core" module with the microcontroller on it, which is plugged into a "carrier" board (i.e. the big circuit board with the lights and speedo). The mileage on the cluster end is stored in flash memory within this microcontroller. If the cold boot via battery disconnect doesn't work, It may be possible to move the core over from the old to new cluster. The question is if the microcontroller is programmed generically and it drives whatever is available on the carrier it is plugged into, or if it is programmed specifically for the carrier.

Attachment 27136

Has anyone tried this yet? I just read through it all and didn't see anyone saying this didn't work.

[goku87]

ive been scouring junk yards here, back home, and on the internet-a-plenty.

i'm almost tempted to say screw it and get the one from the stealership.

its only $460.00ish....

only.......

[CTScott]

Originally Posted by jdms

Has anyone tried this yet? I just read through it all and didn't see anyone saying this didn't work.

Someone from Puerto Rico did, and it did not work for him - The new cluster had a blank display for mileage with the old cluster's core. It may be that you can only swap out ones from the same vintage, or it may be that it just doesn't work.