Why Prius ECU can't reduce battery temperature while Dr Prius app can?

When that white plug in the back rear right quarter get corroded the fan certainly does not work as expected and when they're corroded and broken it doesn't come on at all . It forces you back there to fix it jumper it something I now in the four twos here the fans seem to work as expected . I'm in the 100 not blowing batteries . We also not hard on car I other cars to beat on.

 

@amitt are you getting any codes?

Repair Manual excerpt attached:

 

No codes, i was just actively monitoring temps on dr prius on a hot day. I had suspected this fan for a couple of years now, tried to clean twice, and put some oil on the splinder of the motor.

But when i saw the texhstream mode 4/5 attempt with no fan response, i knew that something is wrong with that auto mode PWM.

Tombukt, that symprom will happen only in auto mode , but work fine in manual active test mode or via dr prius?