The heated seats stopped working.

You have a power seat circuit breaker in rear fuse box, that circuit is hot all the time. The orange wire carries voltage to seat adjuster switch. You need to check ground for adjuster switch, also.

If circuit breaker is overheating it will cause an open circuit.

Pull the release straps located in the trunk. The right strap operates the passenger's side rear split seat. The left strap operates the driver's side rear split seat. Fold the seatback down from the inside of the vehicle

could have faulty heated seat switch or heating unit in seat has open circuit.

To fold-down rear seat on 2007 Chevy Malibu, follow these steps:
1. Open the trunk
2. Pull on one or both the handles located on the upper side of the trunk
3. The handle located on the driver's side will unlatch the bigger part of the read seat
4. The handle on the passenger side will fold down the smaller portion of the rear seat.
5. Once done, you will have a seat that's nicely folded down.

It sounds electrical. I would check your fuses.

Find and check the connectors under the seat for looseness, sometimes these get knocked loose by items pushed under the seat.

Then check the resistance between the connectors going to the seat with a multimeter. They should read something - it they don't the heating pads are shorted (broken).

Then check the voltage at the connector going to the seat with the car and seat heat switch on.

This should tell you where the problem is, please post results here.

its not the module,,its more than likely the drivers side seat heater element,i would say the seatback element,remove the seat cover,just unlatch it under the seat from the rear of seat under it and then pull up its velcrod on,,and then youll see a little burn on the heater pad and thats your problem,then you need a new element,,,thats why theydont work,it causes a open in the system

Likely, the heating element in the seat has failed. The reason is simply that the drivers seat is in use more than any other seat in the vehicle. You can check continuity of the element with an ohmeter across the seat side of the heater connector. Check for power at the harness side with a volt meter. If there is power but no continuity, heater element has failed. Personally, I'd probably just live with it but you can either attempt to install a new heater element or if you can find a similar seat in a salvage yard, just buy it and put it in! (whole seat probably costs less than the element!!!

Motor on the seat may have gone out, contacts in switch got dirty or worn, or assembly reached limit and stuck. Try sitting in it pushing back hard and adjust. If not youll need to replace switch,b take seat apart to fix or replace.

check under the seats and make sure the connector is still connected. as for touching cables together DONT do it you asking for trouble.