Transmission Control Systems: Service Precautions

General instructions/safety instructions
The following points must be observed during vehicle diagnosis:
- When replacing a Tiptronic control unit, observe the coding.
- After troubleshooting or repairs, clear the fault memory in the Tiptronic control unit and (for OBD relevant faults) in the DME control module with the 9588 Porsche System Tester II and carry out a test drive.
- After the test drive, read out the fault memory with the 9588 Porsche System Tester II again.

CAUTION:
Danger of damage due to improper handling of batteries and control unit plug connections.
- Disconnect the battery connection terminals only when the engine is switched off.
- Start the engine only when the battery connection terminals are properly connected.
- Pull off or push on plug connections for the control units or other electronic components only when the ignition is switched off.
- Before carrying out welding work on the vehicle, always disconnect the negative terminal of the battery and pull off all plug connections to the 'vehicle electrical system control unit'.