Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
That's about it, the dimmer switch, unless of course there are bulbs burnt out. The "ILLUM" fuse in the fuse block is in between the dimmer switch and the instrument cluster bulbs. Measure the voltage at that fuse while moving the dimmer switch from dim to bright and make sure that the voltage varies according to the dimmer switch position.
There are 6 bulbs in the instrument cluster. They are actually on the same circuit as some other bulbs, so if they all are dim, perhaps the dimmer switch is just plain bad. The other bulbs are 1 bulb for the air bag, 1 bulb for the fog lamp switch, 1 bulb for the selectable ride switch, 1 bulb for the roof beacon switch, 4 bulbs for the HVAC module, 1 bulb for the traction control switch and 2 bulbs for the transfer case control switch. So, are all of these the same brightness or dimness as the instrument cluster bulbs?
here is the wiring diagram,
Like I said, test the voltage at that "ILLUM" fuse in the fuse block. It feeds all of those bulbs I mentioned from the dimmer switch.
Is the entire panel you are talking about just the bulbs in the instrument cluster or all of the bulbs on the instrument panel which some refer to as the dash. The instrument cluster is only the small part that has all the gauges, speedometer, etc.
What about all of those other bulbs I mentioned, they are all fed from the same dimmer switch nd "ILLUM" fuse. Are the instrument cluster bulbs just dim or out completely? Does anything happen at all when moving the dimmer switch from dim to bright?
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