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I have a 1994 Sierra...maybe it's the same. Turn the radio power off. Then press the set button. Then press the volume and/or scan buttons to change hour and mins. I don't recall which does hours and which does mins. But...the radio power is definitely off in order to set it. Hope this helps!

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17y ago
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Q: How do you reset the clock on a 1998 GMC Sierra?
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