I had intermittent trouble with the images as well, so I converted Philbert's post to a PDF for posterity. Hope he doesn't mind me sharing it here!
Well Phil I was going to post my experience installing seat heaters But yours is excellent and does everything I would have. Thanks for posting and saving me the work!Then it was simply a case of tidying up the wiring, and reinstalling the seats (and wiring underneath!) and trim, and connecting the negative battery terminal of course. Recommend testing the system before doing all that is recommended, just in case you missed a connection.
Feedback: This is the best $100 mod I’ve done on any car and despite the hours of time and patience, I think it’s attainable for most anyone with mild skill (I’m pretty good mechanically but not electrically, so that took me longer to figure out the wiring). As mentioned earlier, the first seat took 6 hours and the second one quarter that time, after I’d learned it.
I don’t notice the pads under the upholstery, and neither does my wife.
The heaters are quick to warm and are HOT. There are 4 settings, each a “click” on the turn wheel you see in the photos. There are 5 positions: OFF, 1, 2, 3, 4 (Caliente!). Unlike OEM heated seat switches, these don’t “reset” once the car is off and turned on again – they remain where you left them since they are mechanical. Small tradeoff in my opinion. I’d buy these again and recommend them to anyone who wants to make their non-limited RAV4 a little more winter weather friendly.
Our parking brake was “soft”, talking about 12-14 clicks to engage fully – I wanted it tighter and came across this handy write up (just needed a 10mm wrench and some patience).
Hope this helps – learned a lot here and wanted to give back to help others interested in this.