2015 GMC TERRAIN Seats Problems

VEHICLE WAS BEING DRIVEN ON RURAL STATE HIGHWAY CONTAINING HILLS AND CURVES TO GET SERVICED FOR LOW TIRES. ABOUT 20 MINUTES INTO DRIVE THE SEAT HEATER WAS TURNED ON. ABOUT 5 MINUTES LATER THE RADIO, SPEEDOMETER, TACHOMETER, FUEL, TEMPERATURE GAUGES AND TURN SIGNALS QUIT WORKING. A TOOL SYMBOL SHOWED UP ON THE OPTIONS SCREEN. DURING THE REST OF THE DRIVE THE RADIO WOULD COME ON INTERMITTENTLY. AT THE SERVICE CENTER A CODE SCANNER SHOWED NO CODES. THE VEHICLE BATTERY (NEW) WAS CHECKED AND CABLES WERE CHECKED FOR LOOSE CONNECTIONS AND CORROSION. THE ISSUE CONTINUED THROUGHOUT THE SERVICE. AFTER SERVICE THE VEHICLE WAS PARKED FOR SEVERAL HOURS. AT STARTUP FOR THE RETURN DRIVE THE ISSUE HAD SELF CORRECTED AND DID NOT RETURN.

THE FRONT PASSENGER SEAT BELT CHIME COMES ON EVEN WHEN THERE IS NOTHING OR ALMOST NOTHING IN THE SEAT. THIS MOSTLY HAPPENS WHEN THE AMBIENT TEMPERATURE IS ABOVE 45 DEGREES FAHRENHEIT AND EITHER DURING A BRAKING EVENT OR ACCELERATION EVENT (EITHER FROM A STOP OR DURING AN OVERTAKE MENUVER). IT ALSO OCCURS WHEN THE VEHICLE SPEED GOES ABOVE 60MPH. IN ALL THESE SITUATIONS THE CHIME COMES ON AT MOST IN-OPPORTUNE TIMES WHILE THE VEHICLE IS IN MOTION STARTLING THE DRIVER CAUSING HIM/HER TO TAKE THE EYES OFF THE ROAD TO LOOK AROUND WHAT IS GOING ON WITH THE VEHICLE. THIS ISSUE HAS RESULTED IN MULTIPLE NEAR MISS OCCURRANCES WHILE I HAVE MY 15 MONTH OLD BABY IN THE VEHICLE! THE ISSUE STARTED OCCURRING IN AUGUST 2015 (ABOUT 4.5 MONTHS AFTER I GOT THE VEHICLE). THE DEALER SAYS THAT THIS IS A KNOWN PROBLEM WITH THESE VEHICLES AND THAT NOTHING CAN...