Cobalt L4-2.0L SC VIN P (2005)
Courtesy Lamp: Description and Operation
COURTESY/ILLUMINATED ENTRY LAMPS
This group includes lamps that may be manually turned ON by placing the interior lamp switch in the ON position, or by opening a door.
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The dome lamp
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The reading lamps
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The rearview mirror lamps
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The vanity mirror lamps
The dome lamp switch has 3 positions: DOOR, OFF, and ON. When in the DOOR position, the dome lamp operation is controlled by the body control
module (BCM). The ON position provides a ground for continuous operation. Ground is provided at G302. The OFF position turns OFF any dome lamp
operation. The courtesy lamps, may be manually turned ON by placing the instrument panel (I/P) dimmer switch in the DOME position. When the dome
lamp switch is in the DOOR position, the dome lamp will illuminate when a door is opened. When a door is opened, the courtesy lamps turn ON. After
all the doors have been closed, the courtesy lamps will remain illuminated approximately 10 seconds after the last door closes. When the driver places
the dome lamp switch in the OFF position, the dome lamp will be disabled.
The inadvertent power control circuit of the BCM supplies battery positive voltage to the dome lamp, reading lamps, and vanity mirror lamps. When any
door is opened, the door jam switch contacts close and the door open input to the BCM is grounded.
If the driver inadvertently leaves any interior lamp ON, the BCM will turn it OFF after 20 minutes.
The courtesy lamps will normally turn OFF using the theater dimming feature. The BCM provides a pulse width modulated ground to the dome lamp for
the theater dimming feature. The courtesy lamps will also turn OFF immediately if a door lock command is received with all the doors closed, or if the
ignition switch is turned to the ON position.
