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Look to the left directly under the driver side left AC vent you will see a dial. Turn it to the left or right to totally remove the courtesy light and dim the dash light. That's the only way i know you can remove the annoying light
Yes it can but you'll need a good scan tool that can do component testing and the vehicle workshop manual or access to Alldata to know the values you should be getting from your test.
You might not get any code if your vacuum system is the culprit.