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The dash lights are incorporated with the parklights. The heater control lights are incoporated with the dash lights. Make sure the dimmer switch is in the full illumination mode. It is possible the park light that is not working is burned out and causing a resistance issue amongst the park light circuitry. Replace the non working park light and retest
Sounds like the connection behind the instrument cluster is loose, i had a customer with the same problem only on a 2012 camry and it turned out to be the connection on the cluster. I just adjusted the tension on the connection by bending the contact pins a little.
Hello This sounds like a bad earth or a wire has broke. Check any wires that go through the A post to the door. Opening and closing the door makes these wires brittle, especially the black one which is the thickest and can cause all kinds of strange problems. Move back the rubber cover and move each wire. If this does not help ask me again and I will try to give you some more pointers.
You need to replace the bulbs behind the heater control. The bulbs have rather large filaments, and hitting the control sometimes makes the filaments "weld themselves" back together for a short time. I would not suspect a short or a loose wire.