The dimming action on mine is very subtle, although I believe it to be working and I've no complaints.
My rear view vision in daylight is clear, just as though it was a slightly tinted conventional mirror. It sounds as though your's is defective?
I've never seen an adjustment for it, despite spending a lot of time playing with the vehicle settings.
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GONE: 2015 V60 D4 181 (VEA) R-Design Lux Nav manual in black
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