TWICE, Immobilization

Fig 1: Twice, Immobilization Circuit Diagram

Courtesy of SAAB-SCANIA OF AMERICA, INC.

As standard, the car is fitted with a system that prevents the car from being started without the correct key. There is a transponder in the key with an identification code that is unique for that particular transponder. A receiver fitted round the ignition switch receives the transponder's identification code and sends it on to TWICE, which recognizes the car's transponders. In the event of an incorrect transponder being used, TWICE outputs an error message on the bus.

For more information about the TWICE control module, see SYSTEM OVERVIEW, TWICE  .

For more information about Immobilization, see SYSTEM OVERVIEW, IMMOBILIZER  .