Today after work I walked out to my '08 G35 sedan and found the battery totally dead. The doors wouldn't unlock, and it didn't turn over when I tried to start it. I noticed the Intelligent Key Warning Light flashing dimly in the instrument panel.

I got a jump start and drove home. At home, the Intelligent Key Warning Light continued to flash. I replaced the battery in my key, but it didn't make any difference. As far as I can tell, everything works fine -- I can lock/unlock the car and start it normally.

Has anyone seen this before? I'm hoping to avoid a trip to the dealer, but I also don't want to get stranded again.

 

Try an ECU reset now that everything is working. Use the gas pedal method instead of messing with the battery.

 

How old is your battery? If it's 3 years or older, just replace it. I had similar issues when my battery was going out. Replace it before you get stranded.

 

Your car battery was going out or your key fob battery?