Volvo VNL 780 Operator's Manual page 162

152 INSTRUMENTS AND CONTROLS
The red courtesy light comes on when the door is opened. The lens is red to alert oncoming
traffic from the rear that the door is open. It is also used during night driving to light up the
floor area and steps without distracting the driver with a glaring light.
CAUTION
DO NOT use sleeves of any kind over
bulbs in the interior lamps. The bulbs
may over heat causing damage to the
fixture including possible fire.
W8003521