LV ELECTRICAL SYSTEM 138 2. AUTO LIGHT FUNCTION: • Auto Light function is activate if the auto light switch is in auto mode and ignition is ON. • Light sensor sends the light information to BCM, all the time it is active. BCM shall analyze the data and act accordingly. • Both auto light and auto rain function has separate control. Rain Light sensor Controller interfacing with BCM to activate the auto light function: • LIN based controller supplies the LIN signal to the Body Control Module. • BCM gets the auto wipe activation input from the combination switch. BCM shall communicate the analog sensitivity settings to RLS. RLS detects the intensity of rain based on these threshold values. BCM shall then activate the auto wipe function as per signals from rain sensor. • BCM gets the auto light activation input either from the master light switch or from the combination switch or from a separate switch on fascia. BCM shall communicate with the LIN based light sensor and receive the signals from light sensor. • These signals to be evaluated by the BCM, decides when to activate the Auto light function, which includes: Parking light ON Head lamp ON (Low/high beam) Solar Sensor Function: Solar sensor delivers the sun intensity received by its two solar diodes (left and right) via LIN to the BCM (LIN-Master). BCM receives LIN messages from RLS and updates the Left solar radiation & Right solar radiation information over CAN, provided Ignition is ON." 3. AUTO DEFOG MODE: FATC system uses Rain Light Humidity Solar (RLHS) sensor (placed behind IRVM) to measure humidity level around windshield glass and estimate chances of condensation build-up over windshield. When there is a chance of condensation, FATC will activate Auto-Defog Mode to avoid condensation formation over windshield. This ensures windshield will be clear for safe driving experience. NOTE: Auto defog function would be activated in Auto mode only. Defog symbol will be visible on infotainment unit whenever Auto-Defog Mode gets activated. In Auto defog mode FATC would automatically adjust blower speed, air distribution mode, air intake mode.
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