Battery Replacement on 99 Avalon xls

[edge10]

I need to replace the battery on a 99 Avalon xls. It has factory alarm and Stereo with tape/CD . Is the anything that needs to be done with the alarm or the radio lockout before the new battery is installed?

[toyomoho]

Determine if the stereo has theft protection (the front panel should have words to this effect). If so, was the code set. If it was and you remove power the code will need to be inputted to get the stereo to work (or get it from the dealer but this may cost money).

The car alarm depends on what type. It may go off and if the car has an engine immobilizer the engine will not start until the alarm is reset.

The best way to change the old battery is to keep power to the battery cables via small wires from the new battery. By doing this, power will never be lost to the cars systems.