Battery Power Protection; Exterior Lighting Battery Saver - GMC Yukon 2021 Owner's Manual

140 Lighting
displayed and it is recommended that the
driver reduce the electrical loads as much as
possible.

Battery Power Protection

This feature shuts off the dome and reading
lamps if they are left on for more than
10 minutes when the ignition is off. This will
keep the battery from running down.

Exterior Lighting Battery Saver

The exterior lamps turn off about 10 minutes
after the ignition is turned off, if the parking
lamps or headlamps have been manually
left on. This protects against draining the
battery. To restart the 10-minute timer, turn
the exterior lamp control to the position
and then back to the or position.
To keep the lamps on for more than
10 minutes, the ignition must be on or in
ACC/ACCESSORY.