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Discussion Starter #1 (Edited)
Despite many hours of diagnosing and frustration, I haven't been able to figure out why the interior dome lights, map lights and vanity mirror lights in my '10 9-3X are very dim. (The footwell lights, door lights, and lights in the cargo area work as they should.) Also, as each additional light in the circuit is switched on, the lights that are already on dim even more. This would obviously point to a grounding issue. However, I have checked and cleaned the grounds in the cargo/trunk area. I have also checked and replaced fuses, replaced and reprogrammed the BCM twice, and checked the wiring in the headliner and A-pillar. Now that the BCM and the wiring in the headliner and the A-pillar have been seemingly ruled out, I am not sure where to go next. Door modules perhaps? It occurred to me yesterday, that this problem may have occurred with other GM cars since they share components across platforms. These bloody can-bus systems which rely on computers are super tricky to work on and diagnose.
 

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Check grounding point G3, which is under trunk floor in left.
BCM controls interior light power, but all lights are controlled by REC.
 

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Discussion Starter #3
Check grounding point G3, which is under trunk floor in left.
BCM controls interior light power, but all lights are controlled by REC.
Thank you for the reply. I checked and cleaned the ground in the trunk/cargo area twice. However, I didn't realize that the REC controls lights. Do you know exactly how it functions? If I understand correctly, I think it sends some kind of grounding pulses.
 

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Normally BCM commands main relay and this power goes thru REC to lamps (bulbs). REC controls voltage to bulbs. Ground also goes thru REC to grounding point G3.
 

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Disconnect the 2 vanity mirrors in the sunshades and see if that helps.
 
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