Design And Function: Function

WARNING: This page is about a different car, the 2004 Volvo S40, 2003 Volvo S40, 2002 Volvo S40, 2001 Volvo S40, and 2000 Volvo S40. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Components Which Require Battery Current

Courtesy of VOLVO CARS OF NORTH AMERICA.

The function of the battery in a car is to supply the car with a stable voltage in all situations. One of the tasks of the battery is to provide a current when starting the engine. Other tasks are to provide a current to components (such as the parking lamps) which require current when the engine is not running (i. e. when the generator (GEN) is not charging). The battery also operates as an energy reserve when the capacity of the generator (GEN) is insufficient and needs to be supplemented.