Hi,
> The window could still be wound up, well maybe after a delay, so
whatever
> the problem it wasn't fatal
This time, for you it wasn't fatal. Sometimes it really was nightmares
(esp.
on 307s).
> Also I don' understand why window switches need to be multiplexed, it
seems
> to add an unnecessary complication but then I am no electronics expert.
OK, I'll give my point here.
Multiplexing (muxing in electronics slang) was bought into automotive
industry to reach two goals : one was the amount of wiring needed for the
car (a 405-class had something like 6km - 4 miles), the other being the
invasion of electronis (most of them wanted by the customer himself,
commonly called "comfort features") and for a better interaction between
the
car elements (engine ECU & peripherals for example) - think "pollution
reduction".
So here we are : comfort and cost reduction.
The muxing is (I should write "was" as we could consider it like oldie
now,
first muxed cars at PSA's being the XM and the 605 - on a lighter
integration though) extactly like the relays-to-automates revolution in
industrial installations : replacing the horrible number of relays by only
one automate (Industrial Programmable Automates ?) and a couple of relays.
So we encountered the same nightmare stories due to some hardware and / or
software design issues, exactly the same way. Happily, most of issues were
only software-related at PSA (I except the first 307s and Picasso's where
the BSI itself was subject to some water getting inside).
Errr, I hope it remains easy to understand.
Regards,
--
G.T
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