Thread: Seeing PWM Data
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Old 01-11-2019, 05:08 PM
oldskewel oldskewel is offline
Join Date: Nov 2014
Location: SF Bay Area
Posts: 888
oldskewel is on a distinguished road
You're talking about one of the mysteries of my 2001 3.0i that has puzzled me ever since I came across it. All my lighting is stock. No LEDs retrofitted.

Why does BMW specify dual filament bulbs (specifically for the front turn signal / parking lights) and then only send two wires to the bulb? I've asked that a few times on here, never with a real response. Any thoughts?

I did not check to confirm whether both filaments light up when installed and lit. Confused, but can live with that.
2001 X5 3.0i, 190k miles, AT, owned since 2014
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