System Operation
Interior Lighting
System Operation
System Diagram
Network Message Chart
BCM (Body Control Module) Network Input Messages
HVAC (Heating, Ventilation, and Air Conditioning) Module Network Input Messages
Battery Saver
NOTE: The battery saver time-out is 1 minute if the vehicle has less than 201 km (125 mi).
NOTE: The battery saver does not control the parking lamps if the headlamp switch is in the PARKING LAMPS ON position.
To save battery voltage, the BCM (Body Control Module) provides automatic shut-off of the interior and exterior lamps after a time-out period when the ignition is off. The BCM (Body Control Module) monitors the ignition state and input from the RKE (Remote Keyless Entry) system to determine when to energize or de-energize the battery saver relay and to shut the power off to the lamps. A timer in the BCM (Body Control Module) starts when:
- the ignition changes to OFF,
- any door or liftgate becomes ajar while the ignition is off,
- an UNLOCK button of the RKE (Remote Keyless Entry) transmitter is pressed while the ignition is off,
- a valid keypad code is entered while the ignition is off,
- or the courtesy lamp switch (integrated into the FLM (Front Lighting Control Module)) is used to turn the courtesy lamps on while the ignition is off.
When 10 minutes have elapsed, the BCM (Body Control Module) automatically shuts off voltage to the lamps. The timer restarts (voltage is restored if the BCM (Body Control Module) is in battery saver mode) if:
- the ignition transitions out of OFF,
- any door or liftgate becomes ajar,
- the UNLOCK button of the RKE (Remote Keyless Entry) transmitter is pressed,
- a valid keypad code is entered,
- the courtesy lamp switch is pressed.
Courtesy Lamps
The BCM (Body Control Module) controls all the interior lighting functions and timing by monitoring inputs from the:
- door ajar switches
- liftgate ajar switch (manual liftgate)
- LTM (Liftgate/Trunk Module) (power liftgate)
- ignition state
- courtesy lamp switch (integrated into the FLM (Front Lighting Control Module))
- RKE (Remote Keyless Entry) system
- vehicle speed
The BCM (Body Control Module) sends a 12 volt signal to each door ajar switch and the liftgate latch (manual liftgate) or the LTM (Liftgate/Trunk Module) (power liftgate). When the doors and liftgate are closed, the voltage signals are pulled low, indicating a closed door or liftgate.
The BCM (Body Control Module) monitors input from the RKE (Remote Keyless Entry) transmitter (messaged from the TPM (Tire Pressure Monitor) module on vehicles without IA (Intelligent Access) or from the RFA (Remote Function Actuator) on vehicles with IA (Intelligent Access)) to determine when to activate/deactivate the illuminate entry feature.
The BCM (Body Control Module) monitors input from the FLM (Front Lighting Control Module) over the communication network to determine when to activate/deactivate the courtesy lamps. When the courtesy lamp button is pressed on the FLM (Front Lighting Control Module), it sends a headlamp switch status message to the BCM (Body Control Module) indicating the request.
The BCM (Body Control Module) monitors the ignition state to determine when to activate/deactivate the illuminated exit feature.
Based on the input, the BCM (Body Control Module) controls the solid state relays to provide power to the courtesy lamps.
The BCM (Body Control Module) also provides an overload protection of the interior courtesy and puddle lamp output circuits. When an excessive current draw is detected, the BCM (Body Control Module) disables the affected interior courtesy or puddle lamp circuit driver. REFER to Field Effect Transistor (FET) Protection.
Illuminated Entry
The illuminated entry requests the dimmable backlighting, the parking lamps and the courtesy lamps to illuminate when the ignition is off and a door or liftgate is opened, the RKE (Remote Keyless Entry) transmitter UNLOCK button is pressed, or the vehicle is unlocked using the keyless entry keypad. If no doors are open, the illuminated entry requests the lamps off after 25 seconds have elapsed, the ignition is switched out of off, the RKE (Remote Keyless Entry) transmitter LOCK button is pressed, or the vehicle is locked using the keyless entry keypad.
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 (Remote Keyless Entry) transmitter or the keyless entry keypad, 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 liftgate becomes ajar, or 25 seconds have elapsed.
Theater Lighting
The theater lighting feature ramps-up the courtesy lamps over 0.7 second when courtesy lamp activation is requested. The theater lighting feature ramps-down the courtesy lamps over 1.7 seconds when interior lighting deactivation is requested by any feature other than the panic alarm or battery saver.
Dark Car Feature
The dark car configuration disables the activation of the illuminated entry and illuminated exit features when active. The courtesy lamps can still be activated by the instrument panel dimmer switch.
Interior Lamp Arbitrator
The interior lamp arbitrator (programming within the BCM (Body Control Module)) chooses between the interior lighting delay, the illuminated entry and exit, the battery saver, and the alarm flash processing to determine which feature has precedence of activating and deactivating the interior lamps.
Demand Lamps
The BCM (Body Control Module) monitors the ignition state and inputs from the RKE (Remote Keyless Entry) system to determine when to energize the battery saver relay. When the battery saver relay is energized, voltage is provided to the demand lamps. REFER to Battery Saver.
When the BCM (Body Control Module) is not in battery saver mode, the battery saver relay is energized to provide voltage to the demand lamps.
Ambient Lighting
The HVAC (Heating, Ventilation, and Air Conditioning) module provides the power and ground to the ambient lighting system, while the touchscreen is used to cycle through the different color variations or turn the ambient lighting feature on or off. There are 3 LEDs (Light-emitting Diodes) (red, blue and green) housed within each LED (Light-emitting Diode) assembly. By illuminating various color combinations, the LEDs (Light-emitting Diodes) are able to produce 7 different colors of ambient light.
The ambient lighting LEDs (Light-emitting Diodes) provide illumination to the:
- cupholders (located in the center console)
- storage compartment(s)/map pocket (located in the center console)
- front footwells (located under the instrument panel)
- rear footwells (located in the rear of the center console)
- inside pull handles (located in each door trim panel)
- door map pockets (located in each door trim panel)
The APIM (Accessory Protocol Interface Module) uses software to monitor the user interface from the touchscreen. Based on the ambient lighting system selections made using the touchscreen, the APIM (Accessory Protocol Interface Module) sends ambient light color request and ambient light intensity request messages over the communication network for color and brightness settings. The HVAC (Heating, Ventilation, and Air Conditioning) module retains the last color and brightness setting between uses.
The BCM (Body Control Module) transmits parking lamps on, illuminated entry/exit feature active, and open door information over the communication network to the HVAC (Heating, Ventilation, and Air Conditioning) module.
Based on the input received from the FCIM (Front Controls Interface Module) (user preferences) and the BCM (Body Control Module) (parking lamps on, illuminated entry/exit, open door) over the communication network, the HVAC (Heating, Ventilation, and Air Conditioning) module provides voltage to the ambient lighting LEDs (Light-emitting Diodes). The HVAC (Heating, Ventilation, and Air Conditioning) module also provides the ground source for the ambient lighting LEDs (Light-emitting Diodes).