Chevrolet 2001 Blazer Owner's Manual page 130

Overhead Console (If Equipped)
The overhead console includes reading lamps, a
compartment for a garage door opener, a temperature and
compass display and a storage compartment for sunglasses.
Some models have a driver information system in the
console. See "Driver Information System" later in
this section.
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Reading Lamps
The lamps can also be swiveled to point in the
desired direction.
Press the button near each
lamp to turn the reading
lamps on and off.