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This may not sound like a big deal to some, but...
When the door is opened on a C5, the interior lights come on and the Instrument Panel lights are also supposed to come on. My IP lights do not come on. Other owners tell me that theirs do. I remember seeing my first C5 when they were new in the showroom and they did it. I have scoured the service manual and checked wiring connectors, all to no avail. All lights work fine when the light switch is turned to parking and head light settings. So I assume it has to do with the door switch or BCM. Anybody got any ideas where to look next?