Operation CHARM: Car repair manuals for everyone.

Cellular Phones and Portable Two-Way Radios






Cellular Phones and Portable Two-Way Radios.

Radio-based remote (e.g. for garage door openers) and wireless peripherals (e.g. keyboard or PC mouse) may only be used in vehicle when transmission output of device has a maximum of 100 mW.

Cellular phones or other retrofitted two-way units (business equipment) must have external antennas.

Please follow exactly the operating instructions and installation instructions of the manufacturer of mobile telephones, radio-based devices, and antennas.

The devices' optimal range will only be reached with an exterior antenna.

When telephone and two-way radio systems are installed properly there is no danger to safety system e.g. ABS or airbag. A prerequisite is however that there has been no intervention in their installations. Parallel wiring to such systems must be avoided.

Excessively high electromagnetic fields can arise if mobile telephones and radio devices, with or without an incorrectly installed exterior antenna, are used.

In such a case, damage to health and interference with vehicle electronics cannot be ruled out.

By the use of magnetically adhered antennae on vehicle roof, there is the hazard that the compass module will malfunction due to magnetic influence and remaining magnetization of the vehicle roof. For complaints of inaccurate or faulty direction displays on the compass module, ask the customer whether a magnetically adhered antenna is being used before starting repair work.