Check the relay for the heater. Was working on the rear heater on my FJ62 yesterday. Relay would click but still wasn't getting anything through it.
Here's the wiring diagram for it. https://www.ih8mud.com/tech/88lc-wire/88lc-wd3.gif
I figured out the problem. When I pulled the instrument cluster forward the wiring harness came apart so that is an easy fix! I also found the “switch lighting” bulb in the white plastic insert.