Interior Lamps

INTERIOR LIGHTING SYSTEMS

INTERIOR LAMPS
The interior lighting consist of the following three groups.

This first group includes lamps that may not be dimmed.
- Reading/Courtesy Lamps
- Ignition Key Cylinder Lamp
- I/P and Rear Compartment Lamps
- Vanity Mirror Lamps

COURTESY/ILLUMINATED ENTRY LAMPS
The second group include lamps that may be manually turned on by placing the interior lamp switch in the on position, or by opening a door.
- Reading/Courtesy Lamps
- I/P Courtesy Lamps

The courtesy lamps, may be manually turned on by placing the interior lamp switch in the on position, or by opening a door. When the sunload sensor assembly indicates a low light condition, the following scenarios will occur. When a door is opened, the I/P courtesy, the overhead courtesy/reading and the ignition key cylinder lamps turn on. After all the doors have been closed the lamps will remain illuminated approximately 25 seconds after the last door closes. When the sunload sensor assembly indicates daylight conditions, the interior lamps will not illuminate at all.

The INT LP fuse in the fuse block - rear supplies battery positive voltage to the normally open switch contacts of the INT LP relay. The INT LP fuse also supplies battery positive voltage to the INT LP relay coil. The door modules communicate on a simple bus interface (SBI). When you open any door, the switch contacts of the door jamb close. When a door open switch signal is grounded, the door module sends a message to the drivers door module (DDM) in order to indicate that a door is open. The DDM sends a class 2 message to the rear integration module (RIM) in order to indicate which door is open. The RIM activates the INT LP relay in order to provide battery positive voltage to the interior courtesy lamps. When a door is opened, front or rear, the interior courtesy lamps illuminate. The RIM provides a pulse width modulated ground to all interior courtesy lamps for the interior lights theater dimming feature. Some of the courtesy lamps are also used as reading lamps, each reading lamp may be manually turned on or off using it's own respective switch.

The courtesy lamps will normally turn off using the theater dimming feature. The courtesy lamps will also turn off immediately if an all door lock command is received with all the doors closed, or if the ignition switch is turned to either the ON or RUN position.

KEYLESS ENTRY INTERIOR ILLUMINATION
When the remote control door lock receiver (RCDLR) receives a door unlock command from the remote function actuator (RFA) transmitter, the RCDLR will send a class 2 message to the rear integration module (RIM) indicating that an UNLOCK command has been received. The RIM must have inputs that indicate that the ignition switch is OFF, all the doors are closed, and the sunload sensor assembly is indicating low light conditions. The RIM will then activate the INT LP relay, providing battery positive voltage and also a pulse width modulated (PWM) ground to the interior lamps. The RIM will keep the courtesy lamps on approximately 40 seconds and then turn them off through the theater dimming feature. If the door locks are activated to the LOCK position, or if the ignition switch is turned to either the ON or RUN position the courtesy lamps will deactivate immediately. When the sunload sensor assembly indicates daylight conditions, the interior courtesy lamps will not illuminate at all.

I/P COMPARTMENT LAMP
The RIM energizes the INT LP relay which provides battery positive voltage to the I/P compartment lamp. When the I/P compartment is opened, its switch closes to provide a ground circuit and the I/P compartment lamp illuminates.

IGNITION KEY CYLINDER LAMP
The IP fuse in the fuse block - rear supplies positive battery voltage to the ignition key cylinder lamp. The HVAC control module with C67 or IPM with CJ2 controls the switched ground. When the interior lamps are activated by the RCDLR the ignition key cylinder lamp will illuminate for about 40 seconds, or by opening any door, the ignition key cylinder lamp will illuminate for about 25 seconds.

REAR COMPARTMENT LAMP
The RIM energizes the INT LP relay which provides battery positive voltage to the rear compartment courtesy lamp. When the rear compartment is opened, its switch closes to provide a ground circuit and the rear compartment lamp illuminates.

VANITY LAMPS
The RIM energizes the INT LP relay which provides battery positive voltage to the vanity mirror lamps. When the vanity mirror cover on the sunshade is opened, its switch closes to provide a ground circuit and the vanity lamp illuminates.

INTERIOR LAMPS DIMMING
The third group includes lamps which may be dimmed. This group may use a combination of vacuum fluorescent (VF) illumination and of incandescent lamps.
- Door switches and the window switches
- Driver information center switch
- Fog lamp switch
- Hazard warning switch
- Head up display switch
- Heated seat switches
- HVAC control head assembly
- Memory seat switch
- Radio
- Instrument panel cluster (IPC)
- Shift indicator lamp
- Steering wheel control switches
- Traction control switch

When the ignition switch is turned to the ON position, the vacuum fluorescent (VF) displays turn on at maximum brightness. When the park lamps are on and the sunload sensor assembly indicates low light conditions, all incandescent backlights turn on at the dimming level indicated by the I/P dimmer switch. At the same time all vacuum fluorescent (VF) displays dim to match the indicated dimming level. The fuse block - rear supplies battery positive voltage to the normally open switch of the PRK LP relay. The dash integration module (DIM) supplies battery positive voltage to the PRK LP relay coil. The DIM also provides ground to the relay coil. When the DIM energizes the PRK LP relay, current flow from switch goes through the DIMR fuse to the incandescent dimming circuit of the DIM. With the park lamps on, the DIM sends proportional voltage to the circuit in response to an input from the instrument panel integration module (IPM). The potentiometer of the I/P dimmer switch receives a reference voltage and ground from the HVAC control module with C67 or IPM with CJ2. The potentiometer is an input to the control module. When the driver selects a dimming setting, the control module responds with a message to the DIM indicating this setting. When the I/P dimmer switch is moved from MIN to MAX, all vacuum fluorescent (VF) displays, as well as all incandescent backlights respond from minimum intensity to maximum brightness in response to the I/P dimmer switch.

The incandescent backlighting for the doors also operate in response to a class 2 message regarding dimming intensity. The IPM sends the message to the driver door module (DDM). The DDM sends an SBI message regarding dimming intensity to all the other door modules.

The driver may select parade mode by manually turning on the park lamps during daylight conditions and the displays will become maximum brightness and can not be dimmed.

BATTERY RUN DOWN PROTECTION/INADVERTENT POWER
To provide battery run down protection, the interior lamps will be deactivated automatically under certain conditions. The rear integration module (RIM) initiates a 10 minute timer if the interior lamp relay control output is still active and the ignition switch is in the OFF position. The RIM timer is set to 3 minutes until the vehicle mileage is above 20.3-24.7 km (12.6-15.4 mi). At the end of the designated time, the RIM will deactivate the interior lamp relay, disabling the interior lamps. This feature will be cancelled if any power mode other than OFF becomes active. The RIM will reset the timer if any interior lamp switch is turned on, a door is opened or the remote control door lock receiver (RCDLR) is activated.