Self Test
WARNING: This page is about a different car, the 2006 Land Rover Range Rover. However, it is still accessible from the selected car via links, so may be relevant.
The self test function displays any fault codes that are present for the TSD. The screen also displays the current state of the ignition switch and the battery voltage.
Two additional buttons in the screen allow the technician to clear the fault codes and to test the TSD.