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My '04 manual says this:
Your inside rearview mirror includes two reading lamps.
The lamps will go on when a door is opened. When
the doors are closed, each lamp can be turned on
individually by pressing the switch for that lamp.
There is also an interior console flood lamp located
underneath the rearview mirror which comes on during
nighttime operation or when the reading lamps are on.
It appears you are asking about the Approach Lights. In the Options area of the DIC, you can configure Approach lights ON or OFF. If ON, here is what the manual says:
If you choose APPROACH LIGHTS ON, the fog lamps, front turn signal, rear back-up and courtesy lamps will come on for 30 seconds when you press UNLOCK on the remote keyless entry transmitter. This will occur only when it is dark outside.