User's Manual

1. Description
1.1 Application
System to check the pressure of all tyres of a passenger car that have a gross vehicle weight rating of
4,536 kg or less, to warn drivers of significant under-inflation of tires (and the resulting safety
problems).
If there is a malfunction of the TPMS the driver has to be informed that there is a malfunction of the
system.
The TPMS unit must contain all warning symbols and icons required to comply with the requirements
of FMVSS 138 under the condition that a combined malfunction telltale is used. Further more, the
display must provide a symbol that can display the status of transmission and reception of signals.
It must be possible to adjust the system to the type of tire and to the manufacturer’s recommended cold
inflation pressure. It also must be possible to change the units of measurement for pressure and
temperature. These car specific adjustments should be done during the installation of the system. For
assistance, a small menu has to be integrated into the display unit.
1.2 Electrical connection
The operating voltage for the system will be supplied by the battery of the car. Additionally the ignition
must be connected to wake up the display.
1.3 Functional description
1.3.1 Standby mode
In standby mode the system is working without the display unit to reduce the power consumption. The
display will be switched on when the ignition is switched to the “On” / “Run” position. If there is an
alert only the beeping function is working. When the ignition is switched off the display will be
switched off also.
1.3.2 Startup function test
On switching the ignition to the “On” / “Run” position, the display must start up, illuminating all
function fields as a check of lamp function and displays for 3 seconds and the system have to beep
once on completion of the test.