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Old 06-20-2024, 04:23 PM #1
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Constantly losing power to gauge cluster

Hey all

What started out as a once in a blue moon occurrence has now rapidly become a reliable and very annoying problem, arguably at the worst time it could have. Seemingly whenever it's warm outside - about 80 degrees and above - I randomly lose power to my gauge cluster in the middle of driving. Sometimes it's within 5 minutes, sometimes it's after half an hour, but either way there's no rhyme or reason for it. This means I not only lose my tach and speedo, but all window and HVAC functions as well while driving around in the sun

I've noticed sometimes shutting down and letting the car sit for a minute or two will restore it, but if that doesn't work I have to unplug/replug the dash to get power again. That seemingly works out every single time

I've checked every wire I can for splits or cracks and have tried double-checking any ground I come across but everything seems totally fine. All fuses are good too - some of which I even replaced just for the giggles to see if it would stop it from happening again but to no avail

Anybody have any ideas what could be causing it? Is my dash dying or something? I'm worried that if I replace it altogether then my odometer will change
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Old 06-20-2024, 05:36 PM #2
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Hmm that is odd, that it only happens above 80 degrees. That might lead me to a possible relay. Ambient when cooler then 80 might just be enough to keep the relay cool. Any hotter and the relay shuts off. But I could be wrong too. Have you checked the circuit opening relay? I believe it's the blue one in the fuse box under the hood.

I don't have a wiring diagram in front of me now, so I can't check common grounds and powers.

Any recent electrical work on that system on your rig?
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Old 06-20-2024, 07:06 PM #3
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Hmm that is odd, that it only happens above 80 degrees. That might lead me to a possible relay. Ambient when cooler then 80 might just be enough to keep the relay cool. Any hotter and the relay shuts off. But I could be wrong too. Have you checked the circuit opening relay? I believe it's the blue one in the fuse box under the hood.

I don't have a wiring diagram in front of me now, so I can't check common grounds and powers.

Any recent electrical work on that system on your rig?
Nothing recent, no; the most recent was trying to tap in my diff locker switch to the dash light, but it didn't work so I removed it, and that was back in the winter as well The relay makes a bit of sense, I believe you're right that it's in the engine bay so it could be getting pretty toasty. I might look into replacing it just to be safe and see any changes

Update: reconnected the dash before I went into work and it did the trick. Went out to my truck again on lunch and it's dead again Very strange, hasn't done that before. Usually once it's "fixed" it stays on for a week or so

Anybody know what relay these functions run through? I found it in a thread a few months ago but can't find that particular post anymore
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Last edited by Devbot; 06-20-2024 at 09:30 PM.
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Old 06-28-2024, 04:37 PM #4
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I have included the overall wiring diagram for the 2000 3rd gen. Hopefully it will help you find your gremlins. :-) I am chasing a tail circuit gremlin myself but I need to get a Honda civic done and off my lift to get the 4 runner in the shop.. :-)
Attached Images
File Type: pdf Overall_EWD-2000.pdf (546.3 KB, 6 views)
File Type: pdf Overall_How_to_Read_EWD_2000.pdf (87.0 KB, 6 views)
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Old 07-09-2024, 09:14 PM #5
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Damn thought I was in the clear.... I swapped my tail relay and put a fresh 10 amp fuse in the gauge cluster spot and didn't have the problem for quite some time, only to try and start up my car after sitting in 100 degree sun all day and it all went blank again :/
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Old 07-09-2024, 11:40 PM #6
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Originally Posted by brillo_76 View Post
I have included the overall wiring diagram for the 2000 3rd gen. Hopefully it will help you find your gremlins. :-) I am chasing a tail circuit gremlin myself but I need to get a Honda civic done and off my lift to get the 4 runner in the shop.. :-)
You wouldn't happen to have a wiring diagram for the interior fuse box would you? If not it's no big deal
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Old 07-10-2024, 09:24 AM #7
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Besides the Overall EWD Everything else is individual circuits. I unfortunately, do not have a gauge diagram. :{
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Old 07-16-2024, 04:12 AM #8
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Anyone know where I can find the integration relay on a 2000? When I try and look it up I just find people saying it's under/hugging the interior fuse box, but all I see is one solid unit. Is it perhaps integrated to the fuse box instead of a separate part?
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Old 07-16-2024, 09:53 AM #9
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This is my experience with wiring on my 4runner.
I was having issues in the cluster with the Gear indicator being intermittent, the cruise stopped working and the reverse lights stopped working. We traced the bad wiring to the harness from the neutral safety switch wire loom running from the trans through the engine bay to the fuse box. We unwrapped all the tape around the harness and found a crap load of exposed wires from corrosion or heat exposure, we ended up replacing almost every wire in that loom by hand. So I'd started by unwrapping and seeing if you've got the same issue. Good luck.
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Old 07-16-2024, 10:26 PM #10
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Anyone know where I can find the integration relay on a 2000? When I try and look it up I just find people saying it's under/hugging the interior fuse box, but all I see is one solid unit. Is it perhaps integrated to the fuse box instead of a separate part?
The body ECU is the "integration relay" from what I can find (or has it built in to it...). U can remove and replace the Board but there are many different part numbers even between the same yrs from what I've found (I save the broads from the fuse blocks I save from wrecked 4runner's/Tacoma's. U have to remove the cover on the fuse Box/panel to get access it the unit.
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Old 07-17-2024, 01:26 AM #11
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The body ECU is the "integration relay" from what I can find (or has it built in to it...). U can remove and replace the Board but there are many different part numbers even between the same yrs from what I've found (I save the broads from the fuse blocks I save from wrecked 4runner's/Tacoma's. U have to remove the cover on the fuse Box/panel to get access it the unit.
Well that blows
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