My previous training & experience tells me the bulb out circuits read current draw [side to side] for info… one side burned out = less current draw = indicator ON.
I installed a couple tiny LED bulbs into the citilights the other day… Looked great…. BUT the Bulb OUT light was on afterwards…..
I swapped back the regular incandescent bulbs and things are great once more..
There needs to be a specific load on the circuit for the bulb out indicator to not light up. LEDs don't put enough load on the lighting circuits to meet this requirement, hence the bulb out indicator when you use them.
If you shop around there are LED conversion that have a resistor in them to fool the bulb out circuitry, as this is a common issue with nearly all late model cars.
"Old style" flashers are current dependent. This was intentional; it signaled when you had a bulb out...
There are newer, solid state flashers that solve the rabid flash rate problem.
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