These electronic control modules also record data during normal vehicle operation for diagnostic and
repair purposes. Their recording capability is limited to data (no sound is recorded). Only a small
amount of data is actually recorded over a very limited period of time, or stored when a system fault is
detected by a control module. Some of the data stored may relate to vehicle speed, direction, or
braking, as well as restraint system use and performance in the event of a crash. Stored data can only
be read and downloaded with special equipment.
Using a cellular phone in a motor vehicle when it is not connected to
the vehicle telephone antenna - some important things to know
