car wont start on 2002 Infiniti Q45

all electronic devices(seat,navigation,lights,alarm)are working,but when i turn the key nothing happens?

Asked by for the 2002 Infiniti Q45
Check voltage at the battery, just because the seats etc work, does not mean that the battery has the immense energy it takes to turn over and start your Q. The battery must have a minimum of 12.6 volts at the terminals, if it is 12.4 or lower, then it is discharged.