Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
Check the connector at the instrument cluster for being loose, then if it's ok, unplug it, turn the headlights on park, make sure then test the voltage at the B1 connector of the harness with a voltmeter. It should be the where the gray wire is It should have 12 volts or battery voltage with the engine off. It's it not, make sure the dimmer isn't set to low. If it does have 12 volts, check the ground attached to the right side of the brake pedal bracket for being loose.
If it didn't have 12 volts at B1 (gray wire), and if all of the other lights don't work (hazard/turn signal, traction control switch, surveillance mode switch), then test the voltage at both sides of the rear park lamp fuse in the right I/P junction block and also wiggle to see if it's loose. If it's voltage is less than 12 volts, check the voltage at the "right I/P 1" fuse in the underhood top fuse block and if it has 12 volts, replace the park lamp relay.
Here are the 2 wiring diagrams for the Instrument Illumination Circuit,
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