illum is short for illuminate. I would suspect this is your dash lights.
lights for dash heater controls
Yes, so wdo just stand on engine fuse box.
Well, isn't that a happy little question! "ILLUM" stands for "illumination" in a fuse block information. It's there to let you know which fuse controls the lights or backlighting for a particular component in your vehicle. Just remember to always refer to your vehicle's manual for specific details and keep on painting those happy little fuses!
The fuse for the clock in a 2002 Toyota Sequoia is located in the engine compartment fuse box. Specifically, it is usually labeled as "ILLUM" or "CLOCK" on the fuse box cover. To access the fuse, open the engine compartment and locate the fuse box, then check the corresponding fuse for any signs of damage or a blown element. If the fuse is blown, replacing it should restore power to the clock.
It stand for Screw Terminal (ST)
Cigarette lighter.
In a 1991 Nissan D21, the fuse that controls the instrument panel lights is located in the fuse box inside the engine compartment. The specific fuse is typically labeled as "ILLUM" or "DOME." To access the fuse box, open the hood and look for the plastic cover near the battery. Always refer to the vehicle’s manual for the exact fuse location and specifications.
Ignition off draw.
The Gauges and Dash Lights have a fuse called "Illum / Guages". The fusebox located by the driver door should contain the fuse. If you look at the back of the cover of the fuse box it will tell you what fuse to check. The Dome Light (the light on the roof) has a fuse inside the engine fusebox.
That is in the fuse panel inside the car. Marked I/P illum (instrument panel illumination)
courtesy
Possibly Fuel Injectors.