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Have you had your battery tested? How old is it?
Have you tried moving the dimmer wheel to see if it’s intermittent? Possibly the dash lights are getting dimmed all the way down.
Could you post up a pic of your instrument cluster, and perhaps the heater ac switches?
Are you talking about the lights on the switches themselves, and not the backlighting?
Cluster needs to be rebuilt if your not getting odometer, PRNDL. Etc. Not sure on your radio. The circuit controlling those is your accessory switched 12v wire.
It kind of sounds like a ground issue, might be looking for a common ground for that lighting circuit. A subscription to www.alldatadiy.com will give you access to factory wiring diagrams including ground locations. You might be able to access it on the GM up fitter site as well.This is an intermittent problem. Only does it every now and then. But when it does it, no PRNDL, no ododmeter/dic message, radio, heater, ac light. The radio plays, but you can't see what station your on, the heater and ac works, you just can't see the settings. Next time you start the car up, all is normal.
Had the cluster rebuilt a few years ago, because of speedometer issue.