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Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)
> The mandated OBD-II protocols are only a small subset of what that box
> will translate. OBD-II doesn't apply to the other system, like ABS,
> airbag, climate control etc., these codes are also done through the
> VCT2000. Also when software is loaded into various modules, it also
> comes through the VCT2000 box.
What's mandated is certain data that a vehicle must provide and a standard
format for providing it. To be compliant, Volvo can make anything else they
like available on the OBD bus in any format they like, as long as they
include all the mandated stuff. The job of the interface box should be to
provide a conversion between OBD interface's electrical characterisitcs,
levels, modulation, timing and so forth, and those of the computer port so
that data can pass between the two. The computer software is where the data
gets sorted out to determine whether we're passing standard or proprietary
information in any given chunk of data. At least that's how it works in most
of the tools that are available for US cars that I'm familiar with. So the
question remains: what's going on in the VCT besides signal conversion?
Niels Bengaard - 17 Jun 2005 16:19 GMT
> What's mandated is certain data that a vehicle must provide and a standard
> format for providing it. To be compliant, Volvo can make anything else
[quoted text clipped - 8 lines]
> that I'm familiar with. So the question remains: what's going on in the
> VCT besides signal conversion?
The VCT unit only converts signals.
It can connect to all the systems in the car and not only read error codes
like a normal OBD interface can.
If you want to code new keys you can do that with the VCT unit, if you want
to reprogram cabin lights, climate control etc. the only way is with the
VCT.
I dont think you find an interface in the aftermarket that can do the same
with a Volvo as the VCT.
The VCT is a workshop tool that works along with Vadis, an OBD interface
doesnt.
Niels
Mike F - 17 Jun 2005 18:32 GMT
> > The mandated OBD-II protocols are only a small subset of what that box
> > will translate. OBD-II doesn't apply to the other system, like ABS,
[quoted text clipped - 13 lines]
> of the tools that are available for US cars that I'm familiar with. So the
> question remains: what's going on in the VCT besides signal conversion?
I don't believe there's anything else. Just more signals than are
required under OBD-II. They're just charging what the market will bear,
and some to cover their development costs.

Signature
Mike F.
Thornhill (near Toronto), Ont.
Replace tt with t (twice!) and remove parentheses to email me directly.
(But I check the newsgroup more often than this email address.)