Dodge 2013 Dart Owner's Manual page 204

202 UNDERSTANDING THE FEATURES OF YOUR VEHICLE
Power Lumbar — If Equipped
Vehicles equipped with power driver or passenger seats
may be also be equipped with power lumbar. The power
lumbar switch is located on the outboard side of the
power seat. Push the switch forward or rearward to
increase or decrease the lumbar support. Push the switch
upward or downward to raise or lower the lumbar
support.
Power Lumbar Switch