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System Description INFOID:0000000003533333 Control of the headlamp system operation is dependent upon the position of the combination switch (lighting switch). When the lighting switch is placed in the 2ND position, the BCM (body control module) receives input requesting the headlamps (and tail lamps) illuminate. This input is communicated to the IPDM E/R (intelligent power distribution module engine room) across the CAN communication lines. The CPU (central processing unit) of the IPDM E/R controls the headlamp high and headlamp low relay coils. When energized, these relays direct power to the respective headlamps, which then illuminate. https://www.nicoclub.com/service-manual?fsm=QX56/2007/LT.pdf
It's possible that the condensate drain for the air conditioning evaporator is plugged. This will water on the carpet on humid days to form quickly. If there is antifreeze in the water then the heater core is leaking.
I have been able to reset the check engine light by disconnecting the positive battery terminal for 15 to 20 minutes. This will cause to system to reset and the light should go out. The system will automatically go through a diagnostic cycle to check for problems.
It sounds as if you are having a battery problem. You need to have the battery checked at an Infinity Dealer. The battery should have warranty on it (pro rated) with such a new vehicle. Hope this helps.
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