On 2021-04-14 05:43, micky wrote:

What are the devices in these two parts of a schematic

https://imgur.com/a/mnnzq3O

On the left is probably the lighting for the 2005 Solara trip computer.
The schematic calls it the Upper Console Panel Sub-Assembly which I
think is the part above the radio (but the schematic lists the clock
illumination separately and makes no reference to the outside
thermometer, so that just lives the sort-of trip computer.)

I understand the LEDs but why zener diodes, and another diode (since
there is 12V DC at the top and ground at the bottom)?

The zeners take over when a LED fails open circuit. The other LED then
still gives some light.
The middle and bottom diodes protect against polarity reversal (one
would have been enough, but probably there are two identical assemblies
in ssries).