On early build vehicles, the universal transmitter can be identified by the Homelink® symbol and one red indicator light.
On late build vehicles, the universal transmitter uses the Lear Car2U® System. It is identified by the lack of a symbol, but with 3 red indicator lights. Each of the 3 buttons has a red indicator light located behind the 3 buttons.
The universal transmitter is an integral part of the LH sun visor and provides a convenient way to substitute up to 3 hand-held transmitters with a single built-in device. The universal transmitter can learn the radio frequency codes of most current transmitters. The universal transmitter:
Homelink
Universal Transmitter Programming - General ProceduresFord Focus Principles of Operation
Brake System
Applying the brake pedal uses lever action to push a rod into the brake booster
which, through the use of vacuum, boosts the force of the rod and then transmits
this force into the master cylinder. This produces hydraulic pressure in the master
cylinder. On vehicles not equipped ...