Silverado electrochromic mirror

On a 2000 Silverado, how do you operate the electrochromic mirror. According to the manual you're supposed to hold the temperature button on the mirror down for 15 seconds to turn it on or off. An LED on the mirror lights when its on. But no matter how long you hold the button down, the light stays on, and I assume , so does the electrochromic effect on the mirror. Anyone had this problem? JAG

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JAG
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