take a volt meter and test the voltage at the battery with the car running. around 14 volts, your good, under then you might need an alternator. Next have somone do a battery load test to see if the battery is any good. If the alt is not charging, chances are it needs an alternator but could have other problems also. So cars chaging systems are controled by the pcm and that could be the problem, BUT, I dont think these cars are set up like this.