Replacing Battery On Control Unit For External Communication

NOTIFICATION 

Voltage drop 

• Irreparable damage to control unit 
• Damage to control unit 
• Fault entries in the control unit 
• Control unit programming/coding is aborted 
• Malfunctions in the control unit, even during programming 
  1. Switch off ignition before disconnecting the control unit.
  2. Make sure that the power supply is not interrupted during programming/coding.
  3. Connect the battery charger with at least > current 90 A  to the vehicle battery.

Information 

The PIWIS Tester  instructions take precedence since the description may be different with later Tester releases.

The procedure described here has been structured in general terms. Different text or additional information may appear on the PIWIS Tester. 

1. Connect the Tester to the vehicle and start it. Switch on ignition.
2. Place original remote control (hand-held transmitter) in emergency start tray.

   Courtesy of PORSCHE CARS NORTH AMERICA, INC.

   Emergency start tray

3. Select the vehicle type if required.
4. Select the Connect control unit  in the overview  . Press F12 to continue. The message "Create Vehicle Analysis Log (VAL)?" appears. Press F11 to continue.
5. Drive links/checks  must be selected.
6. Select Backup battery, reset state of health (SoH). 
   1. 6.1  Procedure is performed according to menu guidance.
7. Go back to the overview. 
8. In the overview,  press F7 to switch to the Additional menu. 
9. Read out all fault memories,  work through faults that are stored if necessary and clear the fault memories.
10. Exit the diagnostic application. End operational readiness on the vehicle. Disconnect the Tester from the vehicle.