One problem related to hazard flashing warning light unit has been reported for the 1999 Jeep Cherokee. The most recently reported issues are listed below.
I own a 99 grand Cherokee lareado every now and then the hazard lights, brake lights, and turn signals go out all at the same time. I checked fuses are all good, light bulbs new, and this problem still exist. Also the headlights are really foggy looking making it hard to see on dark roads.