When "Jump - Starting" W/ Car Telephone

Siemens C 2:
- When starting the engine with help of the battery in a different vehicle ensure that the Siemens C 2 telephone is not damaged through overvoltage. Disconnect the sender and receiver from the electrical system prior to starting the engine with outside help.

Siemens C 3 and Motorola C 451:
- Senders and receivers of Siemens C 3 and Motorola C 451 car telephones have overvoltage protection, but calls may not be made while starting the engine with outside help.

Always refer to the pertinent operating instructions of other type and other make car telephones. If in doubt disconnect the sender/receiver from the electrical system.