Hi I replaced my battery yesterday and now my JVC KD-S630 will not turn on whatsoever, no lights. I do not know how to reset, should I be checking a fuse or something. Thanks.

SOURCE: JVC KD-G400 Radio reciever

Try pressing select or Fm/Am button + button 5 for 3sec the disply should say eorope. Good luck

SOURCE: DOESN'T WORK AFTER INSTALLING A NEW CAR BATTERY

did you check the fuse on the back of the radio. it should be a small maxi fuse that might be rated any where from 5 to 20 amps. most of the time it might be helpful to unplug the radio harness and re plug it after 1 minute.

SOURCE: setting clock on jvc radio

Hey here is an instruction page for your clock.
http://resources.jvc.com/Resources/00/01/13/LVT1775-001B.pdf

SOURCE: my jvc kd-g441 will only show display and

get a new cd player

SOURCE: JVC KD-G310 stopped working after battery change

have you pulled the deck and checked the built in fuse beside where wiring harness plugs in