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.” 2. AUTO RAIN FUNCTION: Rain sensor recognizes hitting raindrops on the • windshield and releases the wiping processes of the windshield wiper according to number of the raindrops. Auto rain function is activated if the auto wipe • switch (Part of combination switch) & ignition is ON. P1, P2, P3, P4 & P5 have different sensitivity • level, which is select by driver when auto wipe function is activate. P1 is highest sensitivity & P5 is lowest • sensitivity. FAIL SAFE MODES OF RLS & BCM C. AUTO LIGHT: During below failure conditions the BCM will operate the low beam & parking lights: On detecting the any rain light sensor error • state fault BCM shall log the DTC. LIMP HOME: However, If Lights were made ON by BCM and there is any sensor error or LIN communication error, BCM should continue the LOW beam and park lamps as long as IGN is ON && AUTO is ON. If AUTO==OFF during LIMP HOME then low • beam and park lamps shall be turned OFF. Wiring harness failure (open circuit or short to • battery or short to ground) between RLS to BCM. (Addition with low beam & parking lights user can operate manual High beam through combination switch). AUTO WIPE: Under the “Auto” position condition. If the ECU detects an error on the rain sensor, the system works as following: LV SYSTEM 173
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