Last night I noticed that my passenger side seat heater switch was invisible. No light to indicate its presence or its status (low/high). Is it just a little fuse bulb that I can replace, and if so, how do I get to that little thing? Any help would be awesome. Thanks in advance!

 

The fuse is #15 in the fuse box by your left leg on the kick panel. If the driver's seat switch is lit, then it is the bulb in the other one because one fuse works both seats.

Also check and see if the seat gets warm. If it does, then it is definitely the bulb. I think it is an LED, but you should let the dealer check it out and replace it if necessary.

If you need to pull the fuse, there is a fuse puller in the fuse box under the hood.

 

Yeah, it works. I'm willing to do the job my self. Especially because I did all of my maintenance and mods myself. I have no credentials besides bein' a self-proclaimed bad ass mechanic, so im sure my warranty would be caput as is. Im not willing to pay for that sh!t. So i wanna try it myself, how do I get to the bulb?

 

There are 3 bulbs in the switch. If none are working, it isn't likely that all 3 bulbs blew at the same time, so it sounds like something else.

To get to the switch, you have to remove the center console panel. Click here for the instructions.

Here's a scan for the switch test.

And you can click here for the parts list.

 

As I type my 04 TL is having the exact same switch replaced. The dealer told me that the bulb can not be replaced and they are putting in a new switch. Quite honestly I don't see how any mods that you have made to your car should void this problem under warranty coverage. I would ask them first and save yourself the trouble.