Heated seat won't heat up 2002 cadillac deville. What to check to see problem'

1. Blown Fuse: A blown fuse can prevent power from reaching the heated seat system. Check the owner's manual for the location of the fuse for the heated seats and replace it if necessary.
2. Bad Relay: A bad relay may also prevent power from reaching the heated seat system. Check the relay for the heated seats and replace it if necessary.
3. Bad Heating Element: The heating element in the seat may have failed. If this is the case, you will need to have the seat cushion removed to replace the heating element.
4. Loose Connections: Check for loose connections in the wiring to the heated seat system. Make sure that all connections are tight and secure.
5. Control Switch Failure: The switch that turns on the heated seat may have failed. If the switch is not functioning properly, it will need to be replaced.
6. Bad Wiring: The wiring in the heated seat system may have become damaged or frayed over time. If this is the case, you will need to have the damaged wiring repaired or replaced.

check fuse relay switchs connectors under seat

How to Fix Broken not working seat Heater 2003 10 Cadillac CTS CHEVY GMC SEAT HEATER TROUBLESHOOTING

Many Caddys have/had small "radiators" for heat to the rear passengers located under the front seats. Most shops (or owners) never check them or know they exist.

Try the fuse for the heated seats (check your driver's manual for location). If not, you may need to swap in a new coil.

Welcome to FIxYa.com

I gather you have a over heating issue or no heat which one so to help you

Thank you for using FixYa.com

Regards, Lee Davidian

Check the fuses/circuit breaker for the heated seats, check the switch but most likely it is the pad under the seat cover. This is a high failure item.

The battery is on the passenger side under the lower seat cushion. When removing the rear cushion make sure you disconnect the wiring for the rear heated seat cushion if it is equiped with heated seats

over heating changed thermostat cab heat quit working at the same time. What can I check next.

HELLO.THE BATTERY ON YOUR CAR IS UNDER THE BACK SEAT.SIMPLY PULL UP ON THE FRONT OF THE SEAT BASE AND THE BATTERY WILL BE THERE. (CARFULL IF YOU ARE TAKING THE SEAT OUT THERE IS A CONNECTION ON THE PASSENGER SIDE UNDER THE SEAT FOR THE HEATED SEAT ELEMENT SIMPLY UNPLUG AND THATS IT GOOD LUCK RAY.