This thread is not about an install but it looks like the driver heated seat has burned out or has it.

I know the lower switch does not light up and does not generate heat, but now the higher heat switch does light up but no heat.

I did a search, came up empty.

What steps to rectify?

1) Check the fuse, for starters? But one light on switch works.

 

There was a thread on here where a guy opened up his seat and looked at the heating element. It had a spot, I believe it was on the seat back where the circuit had burned through and opened up. He was able to solder it back together and everything worked once again.

You'll have to look at both circuits, measure them with an ohm meter to see which one is open, either the seat or the seat back. Then remove the leather cover and see if you can find the spot that has failed. They can be repaired, it may be time consuming but it's possible.

Search around a bit more on here and hopefully you can dig up that thread.

 

I think there's also a circuit breaker built into the seat that you could check, as well as checking to see if the wiring to the seat gets power.

 

I have a similar problem.. the passenger side seat doesn't heat up but the lights work in the up or down position. The drivers seat works, the light doesn't light up though

 

Looks like the passenger seat doesn't heat up as well, but the switch does light up.

Havn't had a chance to check the wiring or anything. Too bloody cold.

 

If the switch lights work, which you say they do, then it's not a fuse problem. If the fuse for the heated seats was blown none of the lights would work either. As far as circuit breaker mentioned earlier is concerned that is for the power seats motors has nothing to do with the heated seats.

The power goes from the fuse box to the switches and then to the coils in the seats. It appears either you are not getting power from the switches to the seats or both seat coils are bad. Maybe someone removed a connector for the seats somewhere?