Join Date: Nov 2009
Location: Gaithersburg, MD
Mentioned: 36 Post(s)
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The dash light power is a Pulse-width modulated supply from the BCM (in other words it switches on and off, and the ratio of on to off varies to adjust the light level). The Dimmer switch is just a variable resistor that's an input into the BCM to tell it what level is requested.
You may just have a loose connection somewhere. Start with the supply point, which is the BCM connector C4. Unfortunately that's the one BEHIND the BCM in the footwell.
Owner of "Campbelle", a Brazen 2008 GXP ... with mods piling up...