[SOLVED] Interior button illimination LEDs not working

ilovemyrav · Sep 19, 2023

Hello all,

I recently realized that the illumination LEDs of buttons in the central console do not work. What I mean with "illumination" is that faint light you see on some of the buttons when you turn the headlights on. I went through the maintenance manuals and troubleshoots. However, all of the troubleshooting aim to find out if the actual button LED is defective or not. Mine seems like more systemic.

I tried to find a fuse that would feed the ILLUM signal but could not find any. I will also check if there is a relay somewhere that switches the ILLUM on/off. However, I would like to ask you guys first if you have any experience with a similar problem and can guide me towards the right path.

Model: 2008
Trim: Base
Engine: V6

LEDs that do not turn on with the headlight that I can see:
Climate control knobs, hazard light button, lock button, central console light.

Thank you.

DL175 · Sep 19, 2023

The bulbs for the HVAC are not LEDs for the Base model (and Sport). First make sure the brightness lighting control is turn to maximum. I suspect the fuse could be blown from an accessory that is plugged in somewhere. Check the fuses with a voltmeter with headlights ON and the car running.

ilovemyrav · Sep 21, 2023

I checked all fuses. I broke my back checking the interior fuse box

Excellent user friendly placement Toyota!

Long story short no burnt out ones. I think at this point it needs to go to a shop :-(

I really hope the ILLUM line does not connect lamps/LEDs in series!

Thank you DL175!

road_rascal · Sep 22, 2023

I had to replace a bulb on one of the HVAC knobs a few years ago after my phone mount fell and hit blend door knob. As I recall it wasn't too difficult to pull the panel off and replace the bulb.

ilovemyrav · Oct 24, 2023

[SOLVED]

After revisiting to troubleshoot the problem I was able to solve it.

TLDR
Replaced the 7.5A PANEL fuse in the interior fuse box.

Symptom:
All central console buttons with internal night time illumination fail to illuminate.

Troubleshoot:
The central console illumination part of the wiring diagram shows the source of the ILLUM signal:

Following the 3B junction box connection we find the source relay and fuse:

Fix:

Find the interior fuse box. Helpful video here.
The fuse box cover has the layout of the fuses:
Find fuse 17 (7.5A PANEL) and check it. If it is blown replace it.
Test the illumination of the buttons.

That's it. I hope this helps someone with a similar problem.

[SOLVED] Interior button illimination LEDs not working

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