Lamps/Lighting - Interior (Service Information): Operation

The internal lights are categorized by function. The following tables below identify the internal lights that are powered during each respective function:

Function
Front Footwell/Ingress Egress Lights
Front Overhead Light
Rear Overhead Light
Liftgate Lights

Power and Ground 

• The lamps in the courtesy lamp circuit are provided with a path to ground at all times.
• The primary power feed for the courtesy lighting is supplied by a Pulse-Width Modulated (PWM) high side driver located in the Body Control Module (BCM).

Courtesy Lamp Operation 

• The BCM controls the output of battery voltage for the courtesy lamps based upon hardwired inputs from the dimmer module and electronic message inputs from the Keyless Ignition Node (KIN) and the Radio Frequency Hub (RF-Hub).
• After all of the ajar switch inputs to the BCM transition to open, the BCM will keep the courtesy lamps illuminated for about 30 seconds, then fade the lamps to OFF (theater dimming) over about 3 seconds.
• The BCM also provides courtesy lamp operation based upon a resistor multiplexed input from the interior lighting thumbwheel of the dimmer module, and provides an Illuminated Entry feature in response to certain electronic ignition status  message inputs received from the KIN, the RF-Hub and the Occupant Restraint Controller (ORC) over the CAN data bus. A courtesy lamp DEFEAT mode input based upon a resistor multiplexed input from the interior lighting thumbwheel of the dimmer module thumbwheel will cause the BCM to override normal courtesy lamp operation.
• The BCM provides a battery saver (load shedding) feature for all courtesy lamps, which will automatically turn these lamps OFF if they are left ON for more than about 10 minutes after the electronic ignition status  message transitions to OFF. If any courtesy lamp input is received subsequent to a 10 minute load shed and prior to a new ignition cycle, the courtesy lamps will turn OFF after 90 seconds.

Function
Overhead KUPA Light
Front Footwell/Ingress Egress Lights
Map Pockets
Door Handles

Power and Ground 

• The primary power feed for ambient lighting is supplied by a PWM high side driver located in the BCM.
• Ambient lighting located in each front door is supplied power by a PWM high side driver in each respective door module.

Ambient Lighting Operation 

• The ambient lighting thumbwheel provides a resistor multiplexed input to the BCM.
• The BCM controls the front door ambient lighting using electronic messages sent to the door modules over the CAN data bus.
• The door modules then regulate the voltage output to the front door ambient lighting LED units accordingly.
• The BCM provides direct hardwired outputs to control the door ambient lighting LED units.

Thumbwheel Control Operation 

• Vehicles equipped with the ambient lighting option have a second, dedicated ambient lighting thumbwheel located in the dimmer module.
• This thumbwheel controls the Light Emitting Diode (LED) units in the inside door latch release handle pockets and the door map pockets.
• The ambient lighting can be turned ON at full brightness or OFF using the ambient lighting thumbwheel.
• When the exterior lighting is turned ON, the ambient lighting can be dimmed using the ambient lighting thumbwheel.
• The ambient lighting is also controlled by the courtesy lamp circuit and will be turned ON at full brightness whenever the other courtesy lamps are turned ON, regardless of the ambient lighting thumbwheel setting.

Function
Driver Vanity Light
Passenger Vanity Light
Glovebox Light
Front Overhead Light
Rear Overhead Light

Switched/Convenience Lighting Components 

• Lower Glovebox
• Drivers Vanity Mirror
• Passenger Vanity Mirror
• Front Overhead Ready Lamp
• Rear Overhead Reading Lamp (Side Rails)
• Front Puddle Lamps
• Rear Puddle Lamps

Power and Ground 

• The primary power feed for switched/convenience lighting is supplied by a 7.5A PWM high side driver located in the BCM.
• The primary feed for the front door puddle lamps is supplied by its dedicated door module. Whereas, the rear puddle lamps are fed directly by BCM.

Switched Convenience Lighting Operation 

• The BCM provides a battery saver (load shedding) feature for the reading lamp circuit as well as the courtesy lamp circuit, which will automatically turn these lamps OFF if they are left ON for more than about 10 minutes after the electronic ignition status  message transitions to OFF. If any reading lamp input is received subsequent to a 10 minute load shed and prior to a new ignition cycle, the courtesy lamps will turn OFF after 90 seconds.

Function
Side Mirror Approach Lights

Approach Lamp Lighting Components 

• Drivers Door Mirror Approach Lamp
• Passenger Door Mirror Approach Lamp

Power and Ground 

• Approach Lighting located in each side front mirror is supplied power by a 1.5A PWM high side driver in each respective door module.

Approach Lamp Lighting Operation 

• If the dome lamp are activated and the courtesy lights are ON then the approach lamps will also be ON.

Function
Driver/Passenger Door Sill Lighting

Driver and passenger sill lighting is independent of each other. When the driver or passenger sill light is required to be turned on, the respective DDM/PDM is responsible for activating the output. When either DDM/PDM detect the door ajar switch state to be closed, the DDM/PDM will then deactivate the output.