Lincoln Nautilus Manuals

Lincoln Nautilus: Interior Lighting / Interior Lighting - System Operation and Component Description. Description and Operation

Lincoln Nautilus 2018-2023 Service Manual / Electrical / Lighting / Interior Lighting / Interior Lighting - System Operation and Component Description. Description and Operation

System Operation

System Diagram


Item Description
1 BCM
2 DDM
3 PDM
4 APIM
5 FDIM
6 GWM
7 RGTM
8 Door Ajar Switches
9 Headlamp Switch
10 Overhead Console
11 Overhead Console
12 Rear Courtesy Lamp
13 LH Rear Courtesy Lamp
14 RH Rear Courtesy Lamp
15 RH Welcome Mat Lamp
16 LH Welcome Mat Lamp
17 Luggage Compartment Lamp
18 Liftgate Cargo Lamp
19 Demand Lamps
20 Illuminated Scuff Plates
21 Exterior Door Handle Lamps
22 Interior Door Ambient Lighting LEDs
23 Instrument Panel Ambient Lighting LED
24 Footwell Ambient Lighting LEDs
25 Floor Console Ambient Lighting LEDs
26 without Vista Roof
27 with Vista Roof

Network Message Chart

  DDM And PDM Network Input Messages


Broadcast Message Originating Module Message Purpose
Welcome mat lamp activation   GWM Provides welcome mat lamp request from the GWM to activate the exterior mirror welcome mat lamps.

  GWM Network Input Messages


Broadcast Message Originating Module Message Purpose
Ambient light color/intensity request   APIM Indicates the color and brightness setting selected from the display interface. This commands the ambient color and brightness setting as requested by the operator.
Welcome mat lamp activation   BCM Provides welcome mat lamp request from the GWM to activate the exterior mirror welcome mat lamps.

  BCM Network Input Messages


Broadcast Message Originating Module Message Purpose
Ambient light color/intensity request   GWM Indicates the color and brightness setting selected from the display interface. This commands the ambient color and brightness setting as requested by the operator.

Battery Saver

NOTE: Time-out is 10 seconds if the vehicle is in factory mode or 1 minute if the vehicle is in transport mode.

The BCM provides automatic shut-off of the courtesy and demand lamps after a time-out period when the ignition is OFF. When 10 minutes (30 minutes for demand lamps) have elapsed, the BCM automatically shuts off voltage to the lamps. A timer in the BCM starts/restarts (voltage is restored if the BCM is in battery save mode) when:

  • the ignition transitions to OFF.
  • the front or rear interior lamp was switched ON.
  • any door becomes ajar.
  • any button of a RKE transmitter is pressed.
  • a door is unlocked using the passive entry feature.
  • a valid code was entered on the keyless entry keypad.

Courtesy Lamps

The BCM controls the courtesy lighting functions and timing by monitoring inputs from the following:

  • Ignition state
  • Courtesy lamp switch (integrated into the front interior lamp assembly)
  • Door ajar switches
  • RGTM (power liftgate)
  • RKE system

The BCM sends a voltage signal to each door ajar switch. When the doors are closed, the circuit is switched to ground and the voltage is pulled low, indicating closed doors.

For power liftgate, the BCM sends a voltage signal to the RGTM . When the liftgate is closed, the circuit is switched to ground and the voltage is pulled low, indicating a closed liftgate.

The BCM monitors the ignition state and inputs from the RKE system to determine when to energize the interior light relay. When the interior light relay is energized, voltage is provided to the interior lamps. The BCM controls the voltage side of the courtesy lamps for the illuminated entry and exit features.

For keyless entry, the BCM monitors input from the RKE transmitter (directly from the integrated keyhead transmitters (IKTs) on vehicles without push button start) or from the RFA module (on vehicles with push button start) to determine when to activate/deactivate the illuminated entry and exit functions.

When the welcome mat lamps are requested, the BCM sends a message over the HS-CAN1 to the GWM then the GWM sends the message to the DDM and the PDM over the MS-CAN .

The DDM and the PDM provide voltage to the left and right welcome mat lamps based on messaged input from the BCM .

The interior overhead courtesy lamps can also be activated from the courtesy lamp switch mounted on the front interior lamp. The front interior lamp controls the courtesy lamp function of the rear overhead interior lamps. When the courtesy lamp button is pressed on the front interior lamp, the courtesy lamp function for all the overhead lamps is turned on/off. If any door is open, the BCM command overrides the function of the front courtesy lamp switch and activates the courtesy lamps.

There are three control switches on the front row lamp:

  • Global On
  • Global Off
  • Door Defeat

The global on and off buttons activate or de-activate the overhead courtesy lamps while the doors are closed.

The door defeat button deactivates the overhead courtesy lamps so when the doors are opened the courtesy lamps remain off. When the door defeat function is activated, the door defeat button illuminates amber in color and when de-activated, the button illuminates blue and the courtesy lamps return to normal operation.

If any door is open and the door defeat function is activated, the global on and off buttons will continue to function and activate or de-activate the overhead courtesy lamps.

Illuminated Entry and Exit

The illuminated entry and exit features provide temporary illumination of the parking lamps, the dimmable backlighting, the ambient backlighting and the courtesy lamps. Refer to the table for additional information.

NOTE: An arbitrator (software programming) within the BCM determines which actions take precedence over others (for example, an open door keeps the courtesy lamps on even when a command to lock the doors is received).

Action Parking Lamps Courtesy Lamps Dimmable Backlighting Ambient Lighting
RKE transmitter or mechanical unlocking of the doors On for 25 seconds On for 25 seconds On for 25 seconds Off
RKE transmitter or mechanical locking of the doors Off Off Off Off 3 seconds after courtesy lamps turned off
Open a closed door after previously unlocking (no ignition state change since unlock) Off (on for remaining time if unlocked from transmitter or mechanical unlocking of the doors) On Off On
Close all doors Off On for 25 seconds On for 25 seconds On for 25 seconds
Ignition changed to ON Off On for 25 seconds Off On
Ignition changed out of ON Off On for 25 seconds On for 25 seconds On for 25 seconds
Open a door after the ignition is changed to OFF Off On Off On (color is red on the open door)
Ignition is OFF and doors are unlocked from the door lock switch Off On for 25 seconds Off Off
Ignition is OFF and doors are locked from the door lock switch Off Off Off Off

Demand Lamps

When the BCM is in not in battery saver mode, the interior light output is energized to provide voltage to the demand lamps.

Ambient Lighting

The ambient lighting subsystem consists of the BCM , and the Light Emitting Diodes (LEDs) located within the floor console, front and rear door panels, instrument panel and front and rear footwell areas. The ambient lighting is operational when the ignition is in any state other than OFF (the exception is when it is used in conjunction with the illuminated entry/exit features), the headlamps are on and the outside ambient light level is low. The BCM provides the voltage to the ambient lighting system, while the touchscreen ( FDIM ) is used to cycle through the different color variations or turn the ambient lighting feature on or off. A LIN circuit is routed from the BCM to all of the Light Emitting Diodes (LEDs). There are 3 Light Emitting Diodes (LEDs) (red, blue and green) housed within each LED assembly. By illuminating various color combinations, the Light Emitting Diodes (LEDs) are able to produce different colors of ambient light.

The APIM uses software to monitor the user interface from the touchscreen. Based on the ambient lighting system selections made using the touchscreen, the APIM sends ambient light color request and ambient light intensity request messages over the communication network for color and brightness settings. The BCM retains the last color and brightness setting between uses.

Welcome Mat Lamps

The welcome mat lamps are located on the bottom of the exterior mirrors. They project an image onto the ground a short distance from the vehicle when the lighted entry is enabled. For auto-fold mirrors, the welcome mat lamps turn on when the lighted entry turns on and the power mirrors fold in upon locking or using the switch on the door.

Component Description

Door Ajar Switches

The door ajar switches (ground switches) each receive a voltage signal from the BCM on independent circuits. When the door is closed, the door ajar switch is closed, routing the signal to ground. When the door is opened, the door ajar switch opens.

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