2024 Tacoma WEIRD Electrical Issues - Help!

[TacoDallas]

Hey all, I have a 2024 TRD Offroad Premium AT. Recently, at startup the lights for the fan speed and etc... start bright but dim to nothing as well as the following issues at the same time :

No wipers except on ultra high speed
Tachometer shows zero even when driving
Dome lights do not work
Turbo gauge gets stuck
Radio display in gauge cluster goes blank
Fuel gauge "KM to empty" gets stuck and reads incorrectly

This all eventually starts working again at varying times once you drive for a while. It all seems to start when the truck is first started and then all comes back slowly.
The dealership just did all 3 recalls and could not see any codes. Of course it would not do it for them but as soon as I brought the truck home it all started again.
Any ideas?

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[RedTacoma26]

Based on your description, I would look at the battery first. After startup the voltage maybe low and as you drive it the alternator brings the voltage back to a normal level. This might explain why things start working as you drive it.

 

[djevans]

I'd consider starting with physically checking, tightening, (maybe removing them, sanding, and retightening the connection point) every ground connection point on the vehicle. Remember though, you're under warranty I suspect. (You don't want to do anything that would void the warranty(but you could check to determine if they are secured tightly) I don't have a list, but you will have more than a single battery negative to frame in most cases. "Generally," the battery negative lead attaches to the engine, then other bonding grounds like engine to body, maybe body to dash, even under the dash, I've found them everywhere. I haven't worked as a mechanic since 1974, so a lot has changed but not grounds. They need to be perfect. Finding no anomalies with the grounds, start looking to see If there are any common connection points for the items that are failing. Did you have any dash work done? Maybe some other work? I've found bonding grounds left off or loose from former repairs. This can be really tedious. Check as many plug sets (connectors, for being loose or even corrosion) as you can reach. Call Toyota. You've got to be under warranty, so maybe just keep taking it back. Leave it with them. Let them drive it for a week or two. One more thing... I keep a USb volt meter plugged in to every vehicle I ever own. It finally paid off this week as a matter of fact. My wifes' 2026 LEXUS RX350 Luxury battery charge voltage became erratic. I then had a "BATTERY DEFECTIVE" message pop up on the screen after a few days. It's at Lexus right now. Lexus seemed to know immediately and felt it may be related to a firmware update.

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