Quote:
Originally Posted by DonR
Why would anyone need a bulb out idiot light. Looking out the windsheild and half the road is dark is a pretty good indicator.
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It's not so much an idiot light, but that the ECU will note a fault code if a circuit's not measuring up as expected.
It's an engineer's mind on thoroughness, when they already include an ECU code for high/low/no voltage on engine sensors, to extend the same to other circuits on the car.