Deactivation Procedure

1. Disconnect the battery ground cable, refer to Section 414-01 Battery, Mounting and Cables.

1. Wait one minute for the backup power supply in the air bag electronic crash sensor (ECS) module to deplete its stored energy.

As for the battery - yes it can be faulty. Usually you will get a code B1676 logged in multiple modules which states battery voltage below threshold. If you have this code, test the battery. As a rule of thumb, its always good to have the battery tested anytime you have electrical fault, easy and usually free to do if you don't have a tester yourself. Depending on climate and environment, you should get several years. Not sure what its like in Atlanta, but in Texas, we're lucky to get 4 years, anything past that they should be in Guinness Book. Here in New Zealand where I am now, most Jaguars and Land Rovers are getting get around 6-7 years out of the original battery, the humidity level here is not as high as it is in Houston.