Both - the driver and passenger front seats aren't heating up. When the switch is depressed, the light on the button lights up, but the seats don't heat up. The fuse under the dash is ok.
Check continuity on the seat heaters. If that's ok, check the grounds. Check power to the heaters while you are there.
SOURCE: rear window defroster, no driver heated seat
check the ground on the passenger side of the rear window under the trim panel. That is what was wrong with mine.
SOURCE: Air Conditioned Seat Not Working
check the rail system on the seat. sometimes it pulls the wire out and it doesn't get good enough connection
SOURCE: heat light switch comes on..but the heated seat is
MORE THAN LIKELY THE HEATING ELEMENT HAS MALFUNTIONED. ITS A PRETTY COMMON PROBLEM IN HEATED SEATS
SOURCE: heated seats do not work
First off, I would contact your local Jeep dealer and have them run your VIN # to check for any recalls. The 1999-2004 Grand Cherokees had a recall on the seat heaters. If your vehicle doesn't fall into the VIN # range then either your seat heater switch has gone out, or you have a broken element in the seat heater. I have replaced more seat heaters than switchsm the elements heat up and break. Hope this helps out.
Best of luck
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