A family member of mine had this same issue. They took it down to the local mechanic. They hooked it up to a computer system for cars and reset the computer chip.
All the lights cleared. The reset of the chip cost her around $100. Sometimes these diags find that you have an electrical problem.
You better hope that the chip just needs to be reset. Because electrical problems can be pretty dang expensive, soo much...that most people just deal with it.
We've had a similar problems multiple times with our 89 astro. It's turned out to be the chip several times. It's also turned out to be a loose wire a few times too.
Have a look and if you don't see anything loose, just take it in. It should be an easy fix.
It could be a fuse or messed up wires that would to be checked by a certified mechanic. Thank you.
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