Thanks to both of you for the input. I had already attempted the correct battery connection method before posting, to no avail. Using a multimeter, I did some voltage and continuity checking and found all fuses good and 12V being applied to (one of) the rear plugs on the ECC. This led me to believe ...

I know this is an old post, but I have encountered a similar problem with my 2001 V70 T5 (Manual Shift). Please consider (and answer) the following: 1. From online research, it seems that these Climate Control Modules are very sensitive to electrical circuit spikes and expire often...one account sai...