GMC 2008 Sierra 1500 Pickup Owner's Manual page 208

APPROACH LIGHTING
This feature allows you to select whether or not to have
the exterior lights turn on briefly during low light
periods after unlocking the vehicle using the Remote
Keyless Entry (RKE) transmitter.
Press the customization button until APPROACH
LIGHTING appears on the DIC display. Press the
set/reset button once to access the settings for
this feature. Then press the customization button to
scroll through the following settings:
OFF: The exterior lights will not turn on when you
unlock the vehicle with the RKE transmitter.
ON (default): If it is dark enough outside, the exterior
lights will turn on briefly when you unlock the vehicle
with the RKE transmitter.
The lights will remain on for 20 seconds or until the lock
button on the RKE transmitter is pressed, or the
vehicle is no longer off. See Remote Keyless Entry
(RKE) System Operation on page 2-5 for more
information.
NO CHANGE: No change will be made to this feature.
The current setting will remain.
To select a setting, press the set/reset button while the
desired setting is displayed on the DIC.
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CHIME VOLUME
This feature allows you to select the volume level of
the chime.
Press the customization button until CHIME VOLUME
appears on the DIC display. Press the set/reset button
once to access the settings for this feature. Then
press the customization button to scroll through the
following settings:
NORMAL: The chime volume will be set to a normal
level.
LOUD: The chime volume will be set to a loud level.
NO CHANGE: No change will be made to this feature.
The current setting will remain.
There is no default for chime volume. The volume will
stay at the last known setting.
To select a setting, press the set/reset button while the
desired setting is displayed on the DIC.