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One circuit is constant power to keep the clock and station pre-set memory maintained. The other is for the radio in general. If the clock works, pull both radio fuses and put them back in one at a time to see which one is constant power. If one of them is blown, you can usually see the wire inside it is burned with a gap. I don't believe there is a separate fuse for the CD player apart from the one for the radio. If the radio works but the CD player doesn't, I'm guessing it's an internal problem.
Check your fuse block to make sure the fuse is good - if so, then your radio may have burnt. Also look on the back of the radio to see if there's a fuse mounted in the case. If it's an aftermarket radio, it could have the light wired to the dash light switch which would make the front light up without radio function. Hope this helps!
This is not a fuse problem, it may be a dirty laser lens or a broken loading mechanism, buy a CD player cleaner disk, if that won't work you will have to pull the unit out and send it in for repair at an authorized GM electronics repair station.
I assume you didn't install the radio yourself then? Some installers put a inline fuse in. This would be located behind the radio. Some radios even have a fuse built into themselves, also on back side of radio. If those two solutions don't help ya, check the other fuses. Maybe the wiring for the radio was hooked into a different system other then the radio.
does your cd player come on randomly? it sound like a loose connection on the rear of the radio? check the fuse on back of unit.....or fuse in car!! and how lond have you had the cd player?? could just be worn out!!