While performing normal diagnostics, the voltage may be found on any one of the following underhood electrical center fuses with the ignition o: F26UA, F31UA, F34UA, F39UA, F40UA, or F56UA. These fuses are switched ignition and should not have any voltage with the ignition off. This can cause multiple modules to stay awake and never go to sleep causing a dead battery. These concerns can be intermittent and may be more apparent during wet weather conditions.
Water intrusion into either of the headlamp assemblies, headlamp assembly connections, X110, or X120, could cause any one of the above conditions.
Inspect each headlamp assembly for water intrusion. If the water intrusion is found, disconnect the appropriate headlamp assembly and evaluate the condition. If the condition is alleviated, replace the headlamp assembly as necessary. If disconnecting the headlamp assembly does not alleviate the condition, check for water intrusion in the headlamp assembly connections, X110, or X120, and repair as necessary.