Quote:
Originally Posted by steamship
Maybe someone who can read current flow diagrams can assist. Here is the relevant diagram, and from it I can see that the two heavier wires go to the actual motor. Not sure about the other two.
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There's not really any info there to read, except that the symbols imply that there is some electronics involved. The ECU terminals are marked S+/S- (as opposed to the M+/M- of the motor terminals), so my guess is 'S' stands for signal and that they provide some sort of feedback. It could be a serial data link (probably unlikely), PWM (possible) or a simple 0-5 volts signal. I'd start by putting a (DC) voltmeter across the wires to see how it changes. If that's inconclusive an oscilloscope should reveal what's going on.
The fact that there are only 2 'signal' wires would lead me to suspect that it's just a simple voltage/resistance measurement, anything more sophisticated would require a power connection too. While it's possible to send power and data over the same wire, I think it's rare to see that in automotive applications.
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Mark
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2002 FE S8 Ebony Black Pearl
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