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The first time my SYS light flashed was when my alternator went out while I was driving and the battery was losing charge on my way back home. The next time it flashed was while I was working in the car with the doors open and I removed both of the courtesy light fuses. After finishing the work I went for a drive and forgot to put the courtesy light fuses back in and that caused the SYS light to flash. Put the fuses back in and haven't seen SYS flash since.