Configuration Of The TPMS System

The TPMS system is self-learning. This means that when the vehicle is driven and the sensors transmit messages, the Central electronic module (CEM) receives and registers the ID numbers that the sensors transmitted.

After a process of elimination during a certain period, the Central electronic module (CEM) then decides that the sensors with the four most frequently received ID numbers belong to the vehicle.

There are two diagnostic procedures that can be activated from the diagnostic tool to make the system fully functioning from the factory or if any remedial actions has been carried out at the workshop.

• EOL test (End Of Line, factory test). The procedure is run after the ID number has been programmed in the vehicle. The purpose of this is to check that the entire chain with receiver, Central electronic module (CEM) and Driver information module (DIM) function and that the vehicle can receive transmissions from the sensors when the last tests are run in the factory.
• WS test (Workshop test). The procedure is used to program new IDs to the Central electronic module (CEM) and to check that the system functions correctly. For example, when a sensor has needed to be replaced or if the Central electronic module (CEM) has been replaced.

The differences between the two procedures are that the factory tests only finish OK after the four sensor IDs that are already programmed have been received properly. The workshop test finishes OK as soon as the four sensor IDs have been received.