How to make the HV battery fan to run all the time?

The controller for the fan is located in the black plastic outlet duct mounted to the passenger side of the HV battery.

 

Also, there should be a related code.

 

No codes… unless the battery is allowed to reach over 125f… in which a code for high battery temp is set…
Thanks

 

I believe that is the fan rectifier, and seems to work correctly as the app is able to vary the fan speed. Issue is … the battery temp sensors are reporting the temperature… but something is failing to turn on the fan. App will do all this…thus implying all parts are working. Appears the ecu may have incorrect or no temperature kick on setting in place. I will however take a closer look at that outlet duct component you are referring to.

Thank You
Frank

 

There's nothing to rectify: the power source is already DC and the fan motor runs on DC.

The controller in the duct is not much more than a nice heat-sinked transistor, able to take the pulse-width-modulated SI speed signal from the ECU and drive the fan motor with it. Indeed, your ability to alter the fan
speed manually confirms it is fine.

What does the Data List show as the selected fan speed, at various battery temperatures?

That would imply your ECU is running different firmware than everybody else's ECU. Seems a stretch.

 

Unfortunately, there are no fan icon in hybrid assistant on the Prime so you can't adjust its speed.

 

My hybrid assistant app shows fan speed, and "A" in the fan symbol which designates the app auto control the fan...
Try rotating your phone to display in wide screen... I believe the fan control will show then...

Thanks

 

Thanks for the schematic! This is helpful...
Today I attempted a ecu reset by removing the ground cable from the 12v battery for 5 minutes. This seemed to clear the ecu as removing the 5amp 12v battery fuse did not clear anything.
Now I noticed that toyota ecu will control the fan ...speeds 1-3 ... around 100f fan is at speed 1, at 106f fan speed is at speed 2, at 116f fan went up to speed 3. This is better...but not good enough as the center hv battery bank was red at 121f ...the 3 banks were as follows. 117f, 121f, 116f.
Once I launch and enable Auto fan control on hybrid assist app... fan speed goes to speed 6 (Maximum) and battery temps begin to drop toward 102f over a 20 min period... this is ideally were the battery accepts the maximum 25 amps regenerative or engine charging rate.
I wish I could see what the toyota fan controller speed set points are... suspect only toyota service center can do such...
Gonna may a youtune video soon discussing this issue...
Thanks

Frank