HV battery cooling fan issues

The aux battery can on charge in ready mode be as high as 14.2 volts. This is because it is an AGM "absorbed glass mat" battery, and these have a slightly higher voltage than normal flooded lead acid batteries.

John.

 

So that's probably good thing. On someone's advice, I checked a white connector above the LH side taillight (can anyone explain how is this connector relates to the HV battery blower??). I found some sign of corrosion, but nothing what I would associate with "poor connection". However it seems helped. After cleaning that connector the fan turned on as it should, changed the speed as the temp increased. I only tested twice as takes a bit of time to cool the bastard below 35C. I'll try it a few times and report if the improvement is permanent.

 

This chat is very useful for me and it will be great if we had the same in France. I want to share an issue with my 2005 Prius which occured in October 2020. The cooling fan didn't run. I checked the relay : OK. I check the fan : OK. The connector which is above the fan was corroded and one wire was already connected outside the regular connector. The corrosion seemed limited but I cleaned to get a better connection. I drove again the Prius and the fan started when the battery was warm. The problem was solved.
Hope it will help Prius owner.