RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Dome Lamp: Description and Operation
The dome lamp is controlled by the instrument cluster which provides power at all times, regardless of the ignition switch position. The ground circuit
for the lamp is switched through the integral dome lamp switch or through the door ajar switches via the instrument cluster.
The dome lamp lens and bulb are available for service replacement. If either of the lamp switch or bulb holders is faulty or damaged, the dome lamp
assembly must be replaced.
For service of the dome lamp bulb, refer to the appropriate wiring information.
The dome lamp is activated by the door ajar switches via the instrument cluster. When all of the doors are closed, the lamp can be activated by
depressing the lens. When any door is open, depressing the lamp lense to activate the lamp switch will not turn the lamps off.
The instrument cluster monitors the door ajar switches. When a door is open the instrument cluster grounds the low side drivers to turn ON the lamp.
Upon closing all doors, the instrument cluster initiates a 30 second timer. If any of the doors are opened during the "time out" cycle, the instrument
cluster will reset the timer until all doors are closed. The instrument cluster will faid to off when the doors are closed and the ignition is turned ON, the
time out expires or the power locks are activated.
