Some additional - explanation. Cadillac decided that turning on the HIDs and then moving the shutters (low to high beam) would be too slow and would represent extra wear an tear on the HIDs (high voltage startup, etc.). So, as Texas Jim says, the Flash-to-pass only works when the HIDs are already on (same thing for the CTSs with HIDs). His suggestion that something associated with the shutters has come loose or is way out of adjustment, if you didn't hear the noise before, is probably correct.
Flash To Pass Noise
I noticed last night when I pressed the flash to pass I would hear like a clunking noise or banging noise. Has anyone else ever had this problem or hear a noise when using flash to pass? Thanks.
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