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CajunDodge - 2008 Dodge RAM 1500 ST SWB, Bright Silver Metallic, Magnum V-6
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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.