Trailhunter Coded Like Xmas Lights

[trailhunger]

Drain the main engine battery and find out!...
Last night, I ran accessory mode a couple of times while working on wiring some pigtails in the dark. I had the camper lights on and assumed the system would shut down auxiliaries to preserve 1-2 engine startups. But nope—turns out you can completely drain the main engine battery and theoretically strand yourself in the middle of nowhere. Best to run generator mode as much as possible.

The initial timeout on accessory mode is the line in the sand. You push past it and demand power from the truck, you're in no-man's land. Surprised it gives you power beyond that initial timeout though No clear info if the hybrid cell can backup the main engine battery but it doesn't appear to based on this experience...

After noticing the camper lights were dimming, I decided to start the engine, but that’s when things got interesting. The engine wouldn’t start, and the dash lit up with a slew of codes—everything from the parking brake to check engine, radar SBPK, main system malfunction, and a “visit dealer” alert. The whole nine yards.

I trickle-charged the battery for a few hours, and the engine eventually started, but three main alerts refused to clear. The truck drove fine and even started up in 25-degree weather this morning. I tried disconnecting the battery a couple of times, but it didn’t clear the errors. So, I ordered a Carista.

This afternoon, I jumped in the truck, fired it up, and it was like nothing had ever happened—zero errors. The truck was back to normal without me clearing anything (though the infotainment system logged the errors, which I deleted).

So, yeah, if your main engine battery dies, give it some time, drive it a bit, and you should be back to normal operations assuming the battery health is good.

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[Lets_Taco_Bout_It]

You mean something like this???
lol I FAFO the hard way too

 

[trailhunger]

Yep! thought I'd have to bring it in for a radar recalibration SMH. But yea thank you baby Jesus for clearing the codes magically at some random point midday without me doing really anything to the truck LOL

 

[Lets_Taco_Bout_It]

lol you have more patience than I. I had the roadside tow it to the dealership down the road b/c I couldn’t figure out how to jump a hybrid system. Was too nervous about anything electrical. They replace the normal battery and reset the codes.

me watching them tow my truck while I’m not home, through my home cameras:

 

[TrustButVerify]

Drain the main engine battery and find out!...
Last night, I ran accessory mode a couple of times while working on wiring some pigtails in the dark. I had the camper lights on and assumed the system would shut down auxiliaries to preserve 1-2 engine startups. But nope—turns out you can completely drain the main engine battery and theoretically strand yourself in the middle of nowhere. Best to run generator mode as much as possible.

The initial timeout on accessory mode is the line in the sand. You push past it and demand power from the truck, you're in no-man's land. Surprised it gives you power beyond that initial timeout though No clear info if the hybrid cell can backup the main engine battery but it doesn't appear to based on this experience...

After noticing the camper lights were dimming, I decided to start the engine, but that’s when things got interesting. The engine wouldn’t start, and the dash lit up with a slew of codes—everything from the parking brake to check engine, radar SBPK, main system malfunction, and a “visit dealer” alert. The whole nine yards.

I trickle-charged the battery for a few hours, and the engine eventually started, but three main alerts refused to clear. The truck drove fine and even started up in 25-degree weather this morning. I tried disconnecting the battery a couple of times, but it didn’t clear the errors. So, I ordered a Carista.

This afternoon, I jumped in the truck, fired it up, and it was like nothing had ever happened—zero errors. The truck was back to normal without me clearing anything (though the infotainment system logged the errors, which I deleted).

So, yeah, if your main engine battery dies, give it some time, drive it a bit, and you should be back to normal operations assuming the battery health is good.

Tldr;

Don't kill your battery or the truck won't start.

 

[bking]

The system is very sensitive. When they were working installing my cap, they did something and it started throwing codes. Tons of them. Before I even knew what was happening, my dealer was calling me asking me to bring it in immediately. I cleared the codes in the shop with Carista (I had it in my truck) and they came back. After a couple of battery disconnects everything cleared and has been fine since. I was impressed that they dealer knew about it before me. I found out the hard way with my Wife's Subaru that Japanese cars don't monitor power like their American counterparts and shut off systems that are draining batteries. Live on a dome light in a Japanese car and you're done. My 99 Silverado knew to shut off accessory when it was getting low. Toyota can do better.

 

[CrispyTacoLover]

lol you have more patience than I. I had the roadside tow it to the dealership down the road b/c I couldn’t figure out how to jump a hybrid system. Was too nervous about anything electrical. They replace the normal battery and reset the codes.

me watching them tow my truck while I’m not home, through my home cameras:

Was your truck ok after being towed like that?

 

[Lets_Taco_Bout_It]

Was your truck ok after being towed like that?

yep no issues. They actually put it on skates

 

[trailhunger]

Tldr;

Don't kill your battery or the truck won't start.

ah but you did read it. OpenAI for the condensed version. Good shit in there for people who actually use the aux & accessories

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