
Minor Repairs 267
Electrical System
In order to avoid damage and faults in electrical or electronic systems, electrical accessories should be installed at an authorized Porsche dealerfUse only accessories approved by Porsche.
Replacing fuses or relays with the engine running or the ignition on could cause electrical shock.fDisconnect the negative terminal on the battery during all work on the electrical system.fPlease see the chapter “BATTERY (12 VOLT)” on page 271.
Relays
Relays should be checked or changed only at an authorized workshop.
Changing fuses
In order to prevent damage to the electrical system due to short circuits and overloads, the individual circuits are protected by fuses.
The fuse boxes are located in the side walls of the driver’s and passenger’s footwell respectively. 1. Switch off the load with the defective fuse. 2. Detach the appropriate plastic cover at the finger hole.3. Remove the relevant fuse (see fuse assignment) from its slot using the yellow plastic gripper A (left fuse box) in order to check it.A blown fuse can be identified by the melted metal strip.4. Replace only with fuses of the same rating. Spare fuses can be found in the left-hand fuse box, next to the yellow plastic gripper.We recommend that you use genuine Porsche fuses for replacement.
Information
If a fuse blows repeatedly, the cause of the fault must be corrected immediately.fPlease contact an authorized Porsche dealer.
A - Plastic gripper B - Spare fuses C - Diagnostic socket
Fuses in left footwell
Row A
Changing FusesWARNINGh
No. Designation A
1 Lower left: Air-conditioning fan 40
2 Upper left: PSM control unit 40
3 Lower right: Seat adjustment 25
4 Upper right: not used
14_991_Turbo_21.book Seite 267 Mittwoch, 9. April 2014 2:19 14

268 Minor Repairs
Row B
Row C
No. Designation A
1 Front lid light Front lid actuator
High beam, FL
Low beam, FL
Side marker light, FR
Turn signal lights, RL, FL
40
2 Raised brake light, spoiler
Rear lid actuator
Rear fog light, right
Reversing light, left
Brake light, left
Tail light, left
Daytime driving light, FL
15
3 Alarm horn 15
4 Interior lighting
Hall sensors
Orientation light
License plate light
Rear wiper electronics activation
Heated rear window relay
Central locking LED
Door panels LED
Ambient light
Raised brake light
Rear fog light, left
Brake light, right
Reversing light, right
Daytime driving light, FR
Tail light, right
15
5 Fuel pump relay and control unit 20
6 Filler flap close/open
Washer pump, front/rear
10
7 Front spoiler control unit 30
8 Air conditioning control unit 7,5
9 Instrument cluster Steering columnstopwatch
10
10 PCM 25
No. Designation A
1 Center console button panel Gateway control unit
Diagnostic socket Ignition lock Passenger compartment monitoring sensorLight switch
Bluetooth phone charger
15
2 Start-relevant loads
Footwell lights
Electric ignition lock anti-removal lock
Turn signal light indicator, FL/FR
Emergency flasher button LED
Electric ignition lock light
Side turn signal lights, FR/FL
High beam, FR
Low beam, FR
Turn signal light indicator, RR
Side marker light, FL
40
3 Vehicle Tracking System control unit 5
4 Horn 15
No. Designation A
5 Cabriolet: Convertible-top lock closing mechanism open/closed
Filler flap
Cabriolet: Convertible top storage compartment catch open/close
Rear spoiler control extend/retract
30
6 Power window control unit, FL 25
7 Headlight cleaning system 30
8 PSM control unit 25
9 Alarm siren 5
10 Not used
No. Designation A
14_991_Turbo_21.book Seite 268 Mittwoch, 9. April 2014 2:19 14

272 Minor Repairs
Risk of damage to the fabric, metal or paint from battery acid or electrolyte.fDo not allow battery acid to come in contact with fabric or painted surfaces.fSpilled electrolyte must be rinsed off at once with a solution of baking soda and water to neutralize the acid.
Charge state
A well-charged battery prevents starting problems and has a longer service life.
In order to avoid unintentional battery discharge:
fSwitch off unnecessary electrical loads in city traffic, on short trips or in a line of traffic.fAlways remove the ignition key when leaving the vehicle orswitch off the ignition on vehicles with Porsche Entry & Drive.fAvoid using the Porsche Communication Management system and the audio system when the engine is not running.fPlease see the chapter “CHARGING THE BATTERY” on page 274.
Information
In the cold season in particular or if the vehicle is used primarily for short distances, it may be necessary to recharge the battery from time to time.
Battery care
fEnsure that battery is securely mounted.fKeep battery surface clean and dry.fKeep terminals and connections clean. Corrosion can be prevented by coating the terminals and connections with petroleum jelly or silicone spray.fEnsure that terminal clamps and the vent hose are firmly secured.
Winter driving
The ability of the battery to deliver and store power decreases at low outside temperatures. Moreover, the battery is more heavily loaded in the winter months, e.g. by the heated rear window, the more frequent use of additional lights, the blower and the windshield wipers, etc.fHave the battery checked before the start of winter.
Information
Keep the battery fully charged to prevent it from freezing.
A discharged battery can already freeze at –5 ºC, but a fully charged one only freezes at –40 ºC. fIf the battery is frozen, thaw it out before connecting jump leads.
Laying up the vehicle
If the vehicle is left for long periods in the garage or workshop, the doors and lids should be closed.fRemove the ignition key or disconnect the battery if necessary.
Information
fWhen the battery is disconnected, the alarm system ceases to function.
If the vehicle was locked before the battery was disconnected, the alarm will be triggered when the battery is reconnected.To deactivate the alarm system: fLock the vehicle and unlock it again.
Alarm system, central locking
fThe status of the central locking and alarm system does not change when you disconnect the battery.
Information
Even if you put your vehicle out of operation, the battery still discharges.fThe battery must be charged, i.e. connected to a charger, approximately every 6 weeks in order to preserve battery function.fStore a battery that has been removed in a dark, cool place that is not exposed to frost.
Replacing the battery
The battery is subject to normal wear: its service life depends heavily on the care you give it, climatic conditions and the conditions of use (distances, loads).
It is not possible to use the details on the battery case to determine a comparable battery that meets all the specific requirements of Porsche.fHave the battery removed and installed only by your authorized Porsche dealer.fOnly use an original Porsche battery, with the correct part number, as a replacement. Only this battery meets the specific requirements of the vehicle.
NOTICE
14_991_Turbo_21.book Seite 272 Mittwoch, 9. April 2014 2:19 14

Minor Repairs 273
fAfter you install a new battery, it must be initialized in the control unit.Please contact your authorized Porsche dealer.fPlease observe the disposal instructions for batteries.
Putting vehicle into operation
After the battery is connected or after a fully discharged battery is charged, the PSM warning light lights up on the instrument panel and a message appears on the multi-function display in the instrument panel to indicate a fault.
This fault can be corrected with a few simple steps: 1. Start the engine. To do this, turn the ignition key or the control unit (on vehicles with Porsche Entry & Drive) to ignition lock position 2 twice. 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 PSM warning light goes out and the message is erased from the multi-function display in the instrument panel.3. If the warnings do not disappear, then: Drive carefully to the nearest authorized Porsche dealer.Have the fault corrected.4. After the warnings go out: Stop the vehicle in a suitable place.5. Store the end position for the power windows.
For information on storing the end positions for the power windows: fPlease see the chapter “STORING END POSITION OF THE WINDOWS AFTER CONNECTING THE VEHICLE BATTERY” on page 63.6. Teach tires on vehicles with Tire Pressure Monitoring.
For information on teaching the Tire Pressure Monitoring System (TPMS): fPlease see the chapter “TIRE PRESSURE MENU (TIRE PRESSURE MONITORING SYSTEM, TPMS)” on page 105.7. Store end position on vehicles with a sunroof.
For information on storing the end position for the sunroof: fPlease see the chapter “STORING END POSITION OF THE SUNROOF” on page 66.fPlease see the chapter “STORING END POSITION OF THE ROLL-UP SUNBLIND” on page 67.
External Power Supply, Emergency
starting with jumper cables
If the battery is flat, the battery of another vehicle can be used for starting or as an external power supply with the help of jump leads.
Both batteries must be 12 V batteries. The capacity (Ah) of the donor battery must not be substantially less than that of the flat battery.
The flat battery must be connected correctly to the vehicle’s electrical system.
A short circuit may be caused if unsuitable jumper cables are used or if jumper cable starting is not performed properly. Such short circuits can cause a fire.fUse only standard jumper cables with sufficient cross section and completely insulated alligator clips. Follow the instructions provided by the jumper cable manufacturer.fRoute the jumper cables so that they cannot be caught by moving parts in the engine compartment.The jumper cables must be long enough so that neither vehicles nor cables touch another.fThe vehicles must not touch, otherwise current might flow as soon as the positive terminals are connected.fEnsure that tools or conductive jewelry (rings, chains, watch straps) do not come into contact with the positive jumper cable, the positive battery post or live parts of the vehicle.fImproper hook-up of jumper cables can ruin the alternator.
Jumper Cable HazardsWARNINGh
14_991_Turbo_21.book Seite 273 Mittwoch, 9. April 2014 2:19 14

274 Minor Repairs
fDo not lean over the battery due to danger of chemical burns from leaking acid.
fImproper use of booster battery to start a vehicle may cause an explosion.fKeep sources of ignition away from the battery, e.g. naked flame, burning cigarettes or sparks due to cable contact.fBefore connecting jumper cables, it is essential to thaw out a frozen battery.
Risk of damage due to short circuit.fNever connect jumper cables directly to the battery. Always connect jumper cables to the emergency starting terminals in the luggage compartment.
+ = Battery positive terminal A – = Ground point for external power supply/emergency starting B
Supplying external power/ Performing emergency starting with jumper cables
Always observe the sequence below: 1. Remove cover in luggage compartment. To remove the cover:Please see the chapter “TIRE FILLING COMPRESSOR” on page 198.2. Connect the positive lead (red) to the positive terminal A of the discharged battery first, then connect it to the positive terminal of the donor battery.3. Connect the negative lead (black) first to the negative terminal of the donor battery, then to the ground point B. 4. Leave the engine of the donor vehicle running at a higher engine speed.
5. Start the engine. An attempted start using jump leads should not last more than 15 seconds. Then wait for at least one minute.6. With engine running: Disconnect the negative lead from the ground point B first, then from the negative terminal of the donor battery.7. With engine running: Disconnect the positive lead from the positive terminal of the donor battery first, then from the positive terminal A of the discharged battery.
Charging the battery
Automotive batteries lose their efficiency when not in use. The charge available in your battery can be measured with a battery hydrometer. We recommend that the battery voltage be tested by your authorized Porsche dealer who has the appropriate equipment.
If the car is not driven for prolonged periods, the battery must be charged at least every 6 weeks. A discharged battery allows rapid formation of sulfates, leading to premature deterioration of the plates.
Battery Acid Leakage
Battery Charging and Jumping Hazards
WARNINGh
DANGERh
NOTICE
14_991_Turbo_21.book Seite 274 Mittwoch, 9. April 2014 2:19 14

Minor Repairs 275
fCharge battery in a well-ventilated area due to hydrogen gas explosion risk.fNever charge a frozen battery. It may explode because of gas trapped in the ice. Allow a frozen battery to thaw out first.
fIf you get electrolyte, which is an acid, in your eyes or on your skin, immediately rinse with cold water for several minutes.
Your authorized Porsche dealer will be pleased to advise you about a suitable charger.fAlways observe the instructions provided by the charger manufacturer.fIf the battery is frozen, thaw it out first before charging it.fWhen charging the battery, ensure adequate ventilation.1. Connect the charger to the emergency starting terminals.Only plug into the mains and switch the charger on when it is connected up correctly.2. Switch on the charger. 3. After charging the battery, first switch off the charger and then disconnect it.fPlease see the chapter “PUTTING VEHICLE INTO OPERATION” on page 273.
Changing Car Key
(Remote Control) Battery
Information
fPlease observe the regulations for disposing of batteries.
Car key
If the battery in the remote control becomes too weak, the message “ Replace ignition key battery ” will appear on the multi-function display in the instrument panel.The battery should be changed in this case.
Changing the battery (CR 2032, 3V)
1. Remove the emergency key.
For information on the emergency key: fPlease see the chapter “EMERGENCY KEY” on page 17.2. Lever off the cover on the back of the key housing using a small screwdriver.3. Change the battery (check polarity). 4. Re-fit cover and press together firmly. 5. Insert the emergency key.
Battery Explosion Hazards
Eye or Skin Contact
DANGERh
CAUTIONh
14_991_Turbo_21.book Seite 275 Mittwoch, 9. April 2014 2:19 14

278 Minor Repairs
A-Height adjustment
Height adjustment
1. Switch ignition on. 2. Switch on low beam. 3. Open luggage compartment lid. 4. Remove the relevant toolbox. 5. Open up the cover A for the adjusting screw. 6. Place Allen wrench (5 mm) on adjusting screw. 7. Adjust low beam in the corresponding direction.
Towing
Certain state statutes and local ordinances prohibit towing with a chain, rope or even a tow bar. In addition, damage to your vehicle may result from improper procedures. Consult your authorized Porsche dealer for details.
Flatbed towing is the preferred type of towing to be used on Porsche vehicles.
Information
fAlways observe the laws governing towing and tow-starting.fExercise extreme care when your vehicle is being towed.
No power assistance is available on the towed vehicle when its engine is not running. Greater force is therefore required when braking and steering.fExercise extreme care when your vehicle is being towed.
When the engine is not running, adequate lubrication of the transmission is not guaranteed. Observe the following points to avoid damage to the transmission.
Towing a vehicle on all four wheels
We urge that wherever possible, a car transporter or trailer be used to transport a 911 Turbo vehicle that cannot move under its own power. This is the safest way to transport a down vehicle.
For those instances where a car transporter or trailer is not available, the vehicle may be towed on all four wheels only, provided the following
conditions are strictly met. Failure to meet these conditions will result in serious and expensive damage to the PDK transmission.
If the vehicle's transmission or shifter is already damaged, serious damage will result if the vehicle is not towed with all four wheels off the ground.
Porsche cannot be held responsible for damage incurred in cases where a vehicle has been transported on one or both of its axles.
Towing a vehicle on all four wheels:
fThe vehicle must not be towed if the PDK transmission is in emergency operation mode (“ Transm. failure Park vehicle safely”). The vehicle must be transported with a car transporter or on a trailer.fIf a selector lever emergency release was performed, the vehicle must not be towed. The vehicle must be transported with a car transporter or on a trailer.fMove PDK selector lever to position N. To properly engage selector-lever position N on the display and at the selector lever, the engine must be started once before towing the vehicle. The vehicle can be towed as soon as the selector lever is in position N and selector- lever position N appears on the display.fThe vehicle must always roll on all four wheels when towed.The ignition must be switched on so that the brake lights and turn signal lights operate.fDo not exceed a maximum speed of 30 mph (50 km/h).Maximum towing distance 30 miles (50 km).If towing distances are greater, the vehicle must be transported with a car transporter or on a trailer.
Towed Vehicle HazardsWARNINGh
NOTICE
14_991_Turbo_21.book Seite 278 Mittwoch, 9. April 2014 2:19 14

Minor Repairs 279
Towing a vehicle on one axle:
Raising an axle, irrespective of whether at the front or rear, is only permissible if the drive shaft (cardan shaft) has been removed beforehand. The ignition must be switched off.fThe vehicle must not be towed if the PDK transmission is in emergency operation mode (yellow or red “ Transm. failure Park vehicle safely ” warning message). The vehicle must be transported with a car transporter or on a trailer.fIf a selector lever emergency release was performed, the vehicle must not be towed. The vehicle must be transported with a car transporter or on a trailer.fMove PDK selector lever to position N. To properly engage selector-lever position N on the display and at the selector lever, the engine must be started once before towing the vehicle. The vehicle can be towed as soon as the selector lever is in position N and selector- lever position N appears on the display.fSwitch ignition off. The ignition key must remain in the ignition lock so that the steering lock does not engage.The control unit must be removed from the ignition lock and the key inserted in vehicles with Porsche Entry & Drive. fPlease see the chapter “EMERGENCY OPERATION – UNLOCKING THE IGNITION KEY/CONTROL UNIT” on page 28.fMake sure that the vehicle is adequately illuminated.
fDo not exceed a maximum speed of 30 mph (50 km/h).Maximum towing distance 30 miles (50 km).If towing distances are greater, the vehicle must be transported with a car transporter or on a trailer.
Pulling out a vehicle stuck in snow, sand, etc.
fAlways pull out the stuck vehicle with the greatest care.fDo not pull out the vehicle abruptly or at an angle. fIf possible, pull the vehicle out backwards in its own tracks.
PDK selector lever emergency release
In the event of an electronics failure, emergency release of the selector lever must be performed in order to move the selector-lever to the N position.
Releasing selector lever
1. Take the plastic wedge from the toolbox. 2. Carefully lever out the rear part of the selector lever gate A on both sides (arrows) using the plastic wedge.3. Carefully lever out the front part of the switch panel B on both sides (arrow) using the plastic wedge.4. Remove the switch module B and place aside. The cable C of the switch panel must not be under tension.
14_991_Turbo_21.book Seite 279 Mittwoch, 9. April 2014 2:19 14