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seat heater (& mystery box)
In message <01bce4d4$a3caae20$3c34f8ce@server> "Lino M. Valadas" writes:
> >the back seat, activate locks and see if it hums.
> >>BTW, there is a black box (controller?) just inside the right end of
> >>rear seat--outboard of the battery. It doesn't show up in the Bentley
> >>controller- layout diagram. Whazzit?
There is a _small_ black box with two wires attached under the rear seat of
many post-1988 cars. It's an accelerometer.
Many ABS systems use _only_ wheel sensors to determine if the vehicle is
moving. The problem is that if you're very unlucky and all of the wheels lock
at once, the system has no input to tell it you're still moving. It was
possible to fool the system fitted in my 1987 Ford Granada this way, especially
on wet ice - it was one of my favourite demonstrations.
Audi has fitted accelerometers since the late 1980s to overcome this problem.
Committee Member, UK Audi [ur-]quattro Owners Club