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C5 Tech... this is a weird issue. I can't find anything online regarding it so anything would be helpful.
When the brakes are applied, or the right indicator is being used, the interior lights on the dash cluster, HUD controls, DIC controls, radio & A/C turn on. Here's a video.
I start pumping the brakes at 0:16. My interior lights are unmodified but my exterior lights are all converted to LEDs. Currently they're all in working order.
I would start by removing bulbs on the right side one at a time to see if they may be the issue.Start at the rear first as they are easier to remove than the DRL.My dash lights would come on when I applied my brakes.Found a bad rear light,replaced it and everything was fine.