Courtesy Lamp: Description and Operation

The Illuminated Entry Feature is controlled by the Central Processing Unit (CPU). The CPU receives inputs from the left and right Door Courtesy Lamp Switches and the left and right Outside Door Handle Switches. The CPU controls the Courtesy Lights, Ignition Key Cylinder lamp, Left and Right Door Key Cylinder Lamps. When all doors are closed and door handles released, the CPU Door Courtesy Lamp Switches input [circuit 300 (R/W)] and the Outside Door Handle Switches input [circuit 302 (R/Y)] are open to ground, and the illuminated entry feature remains dormant. When a door handle is raised. the circuit 302 (R/Y) is grounded, applying ground to the CPU. The CPU then applies ground to circuit 304 (P). The Ignition Key Cylinder Lamp, and the Left and Right Door Key Cylinder Lamps light. When the door handle is released, these lamps remain lit for 20 to 40 seconds. When either door is open, circuit 300 (R/W) to the CPU Door Courtesy Lamp Switches input is grounded. The CPU then applies a ground signal at circuit (333), turning the Courtesy Lamps on. When all doors are closed, the CPU slowly reduces current to the Courtesy Lamps, causing them to dim over a 5 second time period. At that point the CPU turns off the Courtesy Lamps.