A 2009 with an orignal battery? In temps up to 50C? I am not saying this IS the issue, but the days are surely numbered.

How did you 'fix' the other issues? What was wrong, what was the fix for each?

Www.newtis.info for schematics

You really need to understand that modern cars do not enjoy the shade tree mechanic tactics from 1970, like 'discharging' by shorting out contacts, etc. These are complex solid state active devices. Know WHAT you are doing, BEFORE you do it.