CTS V6-2.8L (2006)
Courtesy Lamp: Description and Operation
COURTESY/ILLUMINATED ENTRY LAMPS
Courtesy/illuminated entry lamps are lamps that may be illuminated by opening a door, manually operating a switch or through a remote control door
lock receiver (RCDLR) command. This group consist of the following lamps:
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Door courtesy lamps
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Footwell lamps
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Overhead console courtesy/reading lamps
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Rear compartment lamps
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Vanity mirror lamps
The rear integration module (RIM) controls battery positive voltage and ground to the interior courtesy lamps in the following manner. Battery positive
voltage is supplied through the INTERIOR LAMP fuse to both the switch side and coil side of the interior lamp relay. The RIM provides a ground to the
control circuit of the interior lamp relay during all power modes except when battery run down protection is active. With the interior lamp relay
energized battery positive voltage is supplied to all the interior lamps in this group. The ground side circuits of the door, footwell and overhead courtesy
lamps are controlled by a pulse width modulated (PWM) ground circuit of the RIM. The RIM pulses the on time of the ground circuit between 0-100
percent at a frequency of approximately 100 hertz. By decreasing the on time percentage of the controlled ground circuit the intensity of the lamps will
decrease. This effect is called theater dimming. The RIM will illuminate these lamps under various condition which will be described in the following
information.