Ford Escape: Interior Lighting / Description and Operation - Interior Lighting - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

  GWM Network Input Messages

  BCM Network Input Messages

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 saver 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 and timing functions by monitoring inputs from the following:

• Ignition state
• Courtesy lamp switch (integrated into the overhead console)
• Door ajar switches
• Liftgate ajar switch (manual liftgate)
• RGTM (power liftgate only)
• 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 the manual liftgate, the BCM sends a voltage signal to the liftgate latch. When the liftgate is closed, the circuit is switched to ground and the voltage is pulled low, indicating a closed liftgate.

For the 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.

Illuminated Entry and Exit

The illuminated entry and exit features provide temporary illumination of the parking lamps, dimmable backlighting, ambient backlighting and 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).

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 door panels and front 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 turn the ambient lighting feature on or off. A LIN circuit is routed from the BCM to all of the Light Emitting Diodes (LEDs). The Light Emitting Diodes (LEDs) illuminate ice blue in color.

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 intensity request messages over the communication network for brightness settings. The BCM retains the last brightness setting between uses.

Component Description

Door and Liftgate Ajar Switches

The door and liftgate 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.

Interior Lamp

All of the interior demand lamps receive voltage from the demand lamp relay (integrated into the BCM ) when the battery saver feature is not active. This is used by each interior lamp to power the demand LED within it.

All of the interior courtesy lamps receive voltage from the interior lighting output of the BCM .

The front interior lamp sends a message to the rear lamp(s) to activate/deactivate them through a LIN circuit.