Pontiac 1996 Grand Prix Owner's Manual page 104

Rearview Mirror Reading Lamps Roof Console Reading Lamps (Option)
These lamps go on when you open the doors. When the
doors are closed, turn them on and off with the switches.
These lamps are part of the optional roof console. They
will go on when you open the doors. When the doors are
closed, push the button to turn the lamp on and' off.
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