Quote:
Originally Posted by Fredvon4
BUT back to your idea... no soap.. they had several major area function "how it works" sections with pictures of all the components, interfaces, and CAN Line A and B signalling....
I saw that many of the sensors, and different components, were identified as model specific or requiring TAN and the "other*" code to set a feature or make communicate to the SAM or the ECU**...
*Other... there are actually three other codes besides a TAN code ( maybe, more I noted 2~3 discrete coding methods in the "notes")
** ECU is used by me as a generic name we can relate to...smart does NOT use this acronym and I forget the designation they give the Main computer
Bottom line...IIRC ...the Speedo assy "cluster" is "branded" to the ECU and SAM by a code The item also and had a bunch of superscript #1/2/3 next to it's description with the mandatory micro fine print with the notes or cautions
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smart call the ecu the MEG in the 450 and the ME-SFI in the 451.
TAN code is a "one size fits all" word to save confusion. Apart from the proper TAN, there are things that can be activated with button pushes and things that can be actuated using the MB-star program without a code from Germany.
The sensors have to be there and although the speedo, ECU and SAM are coded together, the info has to be available on the CAN bus for diagnostic purposes. It would be pointless for it to be excluded from the speedo.
Especially considering that all other CAN info is sent to the speedo, the coding on the speedo just decides what it shows and what it ignores.
I have learnt to ignore "how it works" type manuals as they only put down what the techs need to know. This was apparent when I hacked into the 450 LIN bus and displayed readings that were only designed for the Roadster.
Don't work with what they have done, work around what they didn't bother to do.