It was -11 yesterday and my deck didn't fire right away! So I removed the face let the car warm up for 10 and bam it fired.
Today on the other hand I wasn't so lucky - it took almost 30 minutes for it to go.
FYI - It's not a power,ground,ign, issue cause the amps fire and the deck illuminates itself - I just don't get the screen and functionality of the HU
HU - ECLIPSE CD 7100