Porsche 911 GT3 Owner's Manual page 214

Winter operation
The capacity and ability of the battery to store
power decreases at low outside temperatures.
Additionally, more power is consumed while
starting, and the headlights, heater, rear window
defogger, etc., are used more frequently.
f Let your Porsche dealer test the battery's
capacity before winter sets in.
The battery will discharge more quickly if your
vehicle is not driven on a daily basis over a
distance of several miles. The more often you
drive your vehicle, and the longer the distance
driven on each trip, the more opportunity the
vehicle's charging system will have to recharge the
batteries.
Replacing battery
The service life of the battery is subject to normal
wear; it depends greatly on care, climatic condi-
tions, and driving conditions (distances, loads).
f Only use an original Porsche battery, with the
correct part number, as a replacement.
f Please observe the disposal instructions for
batteries.
Putting vehicle into operation
After the battery is connected or after an comple-
tely discharged battery is charged, the multi-
functional PSM light lights up on the instrument
panel and a message appears on the on-board
computer to indicate a fault.
This fault can be remedied with a few simple
steps:
1. Start the engine.
2. With the vehicle stationary, perform a few
steering movements to the left and right and
then drive a short distance in a straight line
until the multifunctinal PSM light goes out and
the message on the on-board computer
disappears.
3. If the warnings do not disappear, then:
Drive carefully to the nearest authorized
Porsche dealer.
Have the fault remedied.
4. After the warnings disappear:
Stop the vehicle in a suitable place.
f Perform adaptation of the power windows:
Please see the chapter "STORING END
POSITION OF THE WINDOWS" on Page 29.
Practical Tips, Emergency Service
213