after charging battery, navigation, radio and air didn't com on.
Car had been sitting for a while, and the battery went down. After charging the
battery, the navigation, radio and air didn't come on.
You can try disconnecting a battery cable, wait about 30 seconds then reconnect it, this will reset the computer system. Doing this may cause the alarm system to activate so make sure you know how to shut it off before performing this procedure. Today's electronics need a stable and steadily voltage supply even when sitting, when voltage starts to drop nasty things can happen to control systems, so either use a battery maintainer if your gone for an extended period or remove the battery completely. This will prevent any further damage to electronic systems. HTH
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