Operation
OPERATION
APPROACH LAMPS AND TURN SIGNAL LAMPS - OUTSIDE REAR VIEW MIRROR MOUNTED - 300C HERITAGE EDITION ONLY
The approach lamps will illuminate when:
- RKE Unlock is selected
- Any door is opened - courtesy lamps on
- Dimmer thumbwheel in the Dome Lamp On position.
The one criteria that must be met for this to happen is the vehicle must be in PARK. Basically anytime the vehicle is in PARK and the courtesy lamp are illuminated, the approach lamps will illuminate. There are four LED's in the rear view mirror, the one on top is the approach lamp.
The bus signal comes from the CCN, but the Driver or Passenger Door Modules actually turn the lamps ON and OFF. With the IOD fuse pulled, the approach lamps will never illuminate. In the bus asleep condition with the door ajar, the Door Module will default to the last known state of the approach lamps and will not turn OFF until commanded to do so by the CCN.
The three lower LED's are the for the turn signal. At any time that the turn signals are used with the ignition is the RUN/start position, the LED's will flash with the vehicles standard equipment turn signals.
The LED's cannot be serviced, repaired, or replaced separately from the mirror glass. If it is found to be a inoperative or burned out LED, the mirror glass must be replaced.
AUTOMATIC HEADLAMP SYSTEM
Automatic headlamps are controlled by the Cab Compartment Node (CCN). With the headlamp switch in the AUTO position, the CCN will control the headlamp, parking, side marker, tail and instrumentation lamps based on ambient light levels. Ambient light levels are monitored by the CCN using the ambient light signal present. Ambient light readings are averaged to limit cycling the lamps ON and OFF when passing through areas with varying light levels. The automatic headlamps will only function when the engine is running with the RPM greater than 300. When the headlamp switch is in the AUTO position (Automatic mode), the Headlamp Time Delay system will function when the ignition switch is placed in any position other than run/start.
DAYTIME RUNNING LAMPS
Power is reduced using pulse-width modulation (PWM) to the high beams, where by the power is switched on and off rapidly instead of remaining on continuously. The duration and interval of the power pulses is programmed into the IPM.
HEADLAMP TIME DELAY SYSTEM
The headlamp time delay system is activated by turning the headlamps ON (high or low beam) while the engine is running, turning the ignition switch OFF, and then turning the headlamp switch OFF. The Cab Compartment Node (CCN) will allow the headlamps to remain ON for 90 seconds (configurable) before they automatically turn off (If the key is in the ignition during the headlamp time delay mode, then both the headlamps and park lamps (including panel dimming) will be ON). Refer to the Owner's Manual for more information.
If the headlamp switch is in the Auto Headlamp Position, the headlamps are ON due to the night signal from the ambient light sensor and the ignition switch is in any position other than run/start, the CCN shall enter a 90 second (configurable) Auto Headlamps time delay mode. If the key is in the ignition during the headlamp time delay mode, then both the headlamps and park lamps (including panel dimming) will be ON. If the key is not in the ignition, then only the headlamps will be ON. The CCN will allow the headlamps to remain ON for 90 seconds before they automatically turn OFF. Refer to the Owner's Manual for more information.
SMARTBEAM(R) SYSTEM
The optional SmartBeam(R) (auto high) system includes the SmartBeam(R) module with digital imager camera and electronic circuitry integral to the electrochromic inside rear view mirror, the SCM, the FCM, the EMIC, the Electronic Vehicle Information Center (EVIC) and the headlamp switch. First, the Auto Low/High option must be enabled using the customer programmable features function of the EVIC, the high beam must be selected with the control stalk being pushed forward, then the A (Automatic) position must be selected using the headlamp switch. Finally, the vehicle speed must be greater than 32 kilometers-per-hour (20 miles-per-hour).
Once all of these prerequisites have been met, the SmartBeam(R) camera and its circuitry within the electrochromic mirror automatically sends the appropriate electronic headlamp beam select switch status messages to the FCM over the CAN data bus. The FCM then responds to these messages by providing a pulse width modulated voltage output to the proper headlamp bulbs through the right and left low and high beam feed circuits to illuminate the headlamps. The FCM also sends the appropriate electronic messages to the EMIC to control the illumination of the high beam indicator.
The SCM continues to monitor the headlamp switch, and will send the appropriate electronic messages to the SmartBeam(R) circuitry in the inside rear view mirror and to the FCM to manually invoke the beam select switch momentary optical horn (flash-to-pass) feature or, when a detent switch position is selected to override SmartBeam(R) operation.