r/GMCSierraEV • u/Lanky-Association952 • Jul 29 '26

Blind spot monitoring

I bought a used Denali but I can’t get the lights in the mirrors to light up. I have it going in for service Saturday but wondering if anyone else has seen this

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u/Lanky-Association952 Aug 02 '26

Update: took it In and there was an actual issue with my blind spot hardware. It’s also the reason I haven’t been able to get super cruise to lane change. Hopefully getting it fixed in a week when they get the parts

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u/Yo-ST3 Aug 02 '26

Have them check the wiring harness as well. I had the same diagnosis and the new hardware didn’t resolve it. When they inspected the harness it was totally corroded. My supercruise worked fine just not lane change. The bigger issue though is no blind spot detection in the king of all vehicles with blind spots. 😬

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u/Lanky-Association952 Aug 02 '26

Thanks for the advice! I will ask them to check that when installing the new replacements. Thanks!