Check the silver ring around the shift knob
The same thing happened to mine when I installed my HU. I removed the silver plastic ring that goes around the shift knob (per the HU install instructions I found on the forum; btw, this ring didn't need to be removed for an HU install), and when I put it back on, it didn't go on properly. It was a little crooked which prevented the s-button from getting pressed all the way in. So, check that silver ring -- remove it and put it back on again. The s-button should click when you press it all the way down. If it doesn't, it probably means it's not getting pressed all the way in.
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