Interior Lighting - System Operation and Component Description

System Operation

System Diagram

Network Message Chart

  DDM And PDM Network Input Messages

  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. A timer in the BCM starts when:

• the ignition transitions to OFF.
• the front or rear interior lamp was switched ON.
• any door or luggage compartment lid/luggage compartment lid 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.

When 10 minutes (30 minutes for demand lamps) have elapsed, the BCM automatically shuts off voltage to the lamps. The timer restarts (voltage is restored if the BCM is in battery saver mode) when:

• the ignition transitions out of OFF.
• the front or rear interior lamp was switched ON.
• any door or luggage compartment lid/luggage compartment lid 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:

• Door ajar switches
• Ignition state
• RKE system

The door modules provide voltage to the left and right puddle lamps based on messaged input from the BCM over the communication network.

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.

The door modules provide ground for the door ajar switch.

The BCM monitors the ignition state and inputs from the RKE system to determine when to energize the interior light output. When the interior light output is energized, voltage is provided to the interior lamps. The BCM controls the ground 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 RFA module, to determine when to activate/deactivate the illuminated entry and exit functions.

The interior 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 interior lamp. When the courtesy lamp button is pressed on the front interior lamp, the courtesy lamp function for all the 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.

The interior courtesy lamps can also be activated from the courtesy lamp switches mounted on the front of the overhead console. The front interior lamp controls the courtesy lamp function of the rear interior lamp.

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 courtesy lamps while the doors are closed.

The door defeat button deactivates the 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 courtesy lamps.

Illuminated Entry

The illuminated entry requests the dimmable backlighting, the parking lamps and the courtesy lamps to illuminate when the ignition is off and the vehicle is unlocked using an RKE transmitter, keyless entry keypad or by passive entry feature. If no doors are open, the illuminated entry requests the lamps off after 25 seconds have elapsed, the ignition is switched out of off or the vehicle is locked using an RKE transmitter, keyless entry keypad or by passive entry feature.

Interior Lighting Delay

The interior lighting delay feature provides temporary illumination of the dimmable backlighting, the parking lamps and the courtesy lamps after the doors are opened and then closed. The interior lighting delay feature keeps the lamps on for a period of 25 seconds after all the doors are closed. If during the 25 second delay time the ignition has been switched out of off, or if the vehicle is locked using the RKE transmitter, keyless entry keypad or by passive entry feature, the lamp illumination is discontinued.

Illuminated Exit

The illuminated exit requests the dimmable backlighting, the parking lamps, and the courtesy lamps to illuminate for 25 seconds after all doors are closed and the ignition is turned off. The illuminated exit deactivates when the ignition transitions out of off, a door or luggage compartment lid becomes ajar, or 25 seconds have elapsed.

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.

The BCM supplies voltage signal to the luggage compartment lamp. The luggage compartment lid ajar switch is grounded. When the luggage compartment lid is opened, the luggage compartment lamp is grounded.

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 7 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.

Dark Car Feature

The dark car feature disables activation of courtesy lamps due to a door unlock, door ajar or removing the key from the ignition cylinder. The courtesy lamps may still be activated by the dome lamp switch, post crash alert, and perimeter and panic alarms.

The dark car feature is enabled/disabled through programmable parameters in the BCM .

Component Description

Door Ajar Switch

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.

Ground is provided to the door ajar switches from the door modules.

Luggage Compartment Lid Ajar Switch

The luggage compartment lid ajar switch (ground switch) receives a voltage signal from the BCM . When the luggage compartment lid is closed, the luggage compartment lid ajar switch is closed, routing the signal to ground. When the luggage compartment lid 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 . This is used by each interior lamp to power the courtesy LED within it.

The front interior lamp sends a message to the rear lamp to activate/deactivate it through a LIN circuit.

A dedicated ground circuit is provided for map lamp functionality.

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