[s-cars] How does it know your headlight ain't on?

[JC]

I have no doubt this would happen.  In my extensives DMM testing I even
tried testing the 'input' pins on the bulbcheck relay one by one to see if I
could figure out which 'sense' lead was triggering it (I think there are 3
or 4 inputs to the logic... one for each headlight, one for turns, one for
brakes, maybe one for parking lights?) but I couldn't ascertain any major
difference between the pins.  I'd been hoping for something like "ahhh yes I
see it's the lead from the brakelights that is different".  Either I haven't
really understood how it works, or, my relay is just bad.

>
> And it's quite sensitive. I've recently replaced the rear
> center brake light with a LED strip and the reduced current
> draw is sensed and causes the warning to come up every time I
> touch the brake for the first time after start up.
>


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