ELECTRICAL 111 2. AUTO LIGHT FUNCTION: Auto Light function is activated if the auto light switch is in auto mode and ignition is ON. The light sensor send the DATA to LIN based controller through LIN communication which indicate the ambient light condition & tunnel condition "RLS sends when to activate the light and with which speed the wipers needs to be activated over LIN to BCM'. 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 PWM signal to the Body Control Module. The signal 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) Cockpit dimming signals PWM FAIL SAFE MODES OF RLS & BCM: AUTO LIGHT: During below failure conditions the BCM will operate the low beam & parking lights: RLS software fails and there is no LIN communication between RLS and rain light controller. (Addition with low beam & parking lights user can operate manual High beam through combination switch). Wiring harness failure (open circuit or short to battery or short to ground) between RLS to RL controller or RL controller to BCM. (Addition with low beam & parking lights user can operate manual High beam through combination switch). BCM software failure. (Only low beam & parking light is possible).refer BCM H/W failsafe/lime home mode from BCM section. Master light switch (Head lamp) switch gets failed or disconnected or any wiring harness issue (open circuit or short to battery or short to ground) between MLS & BCM. (Only low beam & parking light is possible).
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