The CID ( Central Information Display ) hasn't got a green light on it - the display unit with the controls on is the CID.
The grey box with the single green led & 2 connector plugs is the MCU ( Main Control Unit )
The cooling fans on a RRE only work when the MCU activates them, they don't run all the time like the older model Reflex.
Have you checked the battery isn't defective?
Check / tighten the 3 nuts under the trucks battery isolator plug - DISCONNECT the battery first before you go in with the 13mm spanner!
Loose isolator nuts where a known issue, that's Toyota quality control processes for you.
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