New answers tagged headlight
When looking at the car (and I think you have most of it already covered in your question): The leading edges are the most susceptible ... this would include any part of the front fascia The A-pillar and maybe the leading edge of the roof Any part of the side which when looking at it, dips in, then comes back out ... the part which comes back out is ...
There are a couple of possibilities here aside from a bad relay (which appears to have been ruled out by your tests): the light switch has gone bad (stays permanently on) there is an electrical short somewhere in the controller circuit (which the light switch controls) that is bypassing the light switch and always completing the circuit
My suggestion is that the filament inside of the bulb is loose. When you rap on it, it reconnect briefly, which lights the bulb. It will continue to do this until it completely burns out. This will probably require a replacement bulb to fix.
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