Battery fan gets no power

Can you post a picture of the warning light you get, as well as whatever trouble codes you pull from the HV battery ecu.

Again, my experience on my 2006 is that I can only hear the fan at speed 3 (of 6) at around 125°F. 127 is certainly NOT overheating.

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Can’t get that info as this issue has not happened in many months… I have been running the hybrid assistant app to manage the hv blower and I haven’t had any issue since… I am however looking to fix the Toyota onboard management of the blower.

does anyone know what the Toyota factory temperature trigger points are for blower speeds?

 

Someone on this board sent me a wiring diagram for the blower relays and connections… gonna take a closer look, … make sure all is well…

 

<shrug> then keep using the app all the time.

The battery ecu has a number of codes to cover problems with the temperature sensors, the fan electrics, as well as general cooling function. If there was really a problem, there should be a code. (FYI, Hybrid Assistant doesn't pull codes).

It sounds like the cooling fan doesn't work the way YOU think it should. Can't help you there. Nothing specific in Service Info about what temperatures they want. Good luck.

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✌️

 

Do not interfere with the machine's operation.

All control and management algorithms are laid down by Toyota engineers and all factors are taken into account, and not only temperature.

It was not for nothing that they gave a 10-year warranty on the battery.

Or do you think that the factory laid down the wrong algorithms, and you, not knowing these algorithms, will make your own, which will be cooler than the factory ones?

 

I would prefer to let Toyota manage the car and its systems… but it was failing to manage the battery temp and threw over temp alarms on dash. That’s where I stepped in, eventually found I could read the hv temps and manage the blower that Toyota should be managing… App has saved the day for some time now… time to try and get to bottom of why Toyota management is not working correctly. I bought car used with 190k ..
Car appears to have been serviced thru 160k by Toyota dealerships…according to Toyota vin records…
Trying to get this car to tip top shape…

 

So then it would seem to me something should be wrong with the body control module doesn't that run the fans and that sort of thing of course by sensors but these sensors are inside of the battery and they're known to be working because you can read them with an app so the car computer or module should be able to read them without an app so if they're not maybe that's the problem I know nobody wants to change a computer because location and all that but if that's where you're at Pasadena said 127 is not overheating It's getting that way but so the fan comes on at 1:27 and brings the temperature right down to 95 97 or whatever? You just don't want it to see that 125 or 7 I got it

 

Which if you want any help with, we need data. Per post 41, exactly which warnings did you see, and what temperatures at that time. What codes in which ecu.
Leave the app fan control off for a few days, see what happens. Otherwise it's all guessing.

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Something about intentionally letting the HV battery overheat in order to throw a code … that states… “hv battery is over heated”…gives me pause… I don’t recall the code it threw nearly a year ago… but I do recall the hv battery temp was at 127f and the blower was not running. I will continue to search for Toyota acceptable HV hv battery operating temp range. I know that if I leave the app off… the car will sound and perform like it’s getting reduce contribution from the hv battery…if I then check the temps… they will surely be somewhere around 110f.

 

110ºF (43ºC) and 127ºF (52ºC) are not really alarmingly high battery temperatures.

Are you running the A/C in the car? If so, what temperature do you have it set at? If not, what generally is the ambient temperature inside the car?

What was the inverter temperature when this event happened a year ago?

 

I didn’t have the all the current tools or apps at the time of issue. I know the car threw me a “HV battery too hot”…and was able to observe 127f with hybrid assistant app, but it can’t read ecu codes…so I have no codes. A/C was off, cabin temp was likely upper 70s…. 127f seems to be an issue as car threw warning on dash.
It would be very helpful to find the official Toyota HV battery min/max temps. I am also gonna pull apart rear side panels to take a closer look at blower circuitry/relays…hopeful next week or so. someone here sent me a good schematic for blower.

stay tuned…
Frank

 

Have you used some light tissue paper at the air intake in the back seat (RHS) to see if any air is being pulled in? When the fan is running at speeds up to 3, it is hard to feel the airflow without using something like some light paper cut into small strips.

 

no
No… but I will give that a try. I have not been able to feel or hear any air movement in the past… only with the hybrid assistant app can the blower be heard and the temps come down.