Inspect the electrical system for excessive electrical drain (parasitic current drain) if the vehicle battery meets one of the following conditions:

Inspect the vehicle for excessive parasitic current drain if a battery needs recharging and no obvious cause exists.

Failure of one or more of the on-board solid state control modules, such as the PCM, may cause a high parasitic drain on the vehicle's battery. After the circuit continuity is restored, disconnecting the battery in order to install an ammeter or in order to test for excessive current drain may not continue. Cycling the engine control switch to the ON position and then to the LOCK position may cause such a drain to recur. Unless the vehicle's systems are reactivated in a road test, some drains will not recur.

Do not rotate the engine control switch to the following positions with an ammeter installed between the battery terminal and the battery cable:

Use a current drain test tool in order to test the battery for parasitic current drain. Refer to Battery Electrical Drain/Parasitic Load .