User's Manual

1.3.6 TPMS malfunction
A general malfunction is present, if, for example, a sensor’s signal has not been received for more 15
minutes or if the input voltage of the system exceeds or undershoots a range of between 9.5 and 15.5
Volts.
In this case, and in accordance with FMVSS 138, and 2.3.3.7 the “Pressure Warning” icon will blink
for one minute and beep in the same frequency for 15 seconds. The driver must be able turn off the
beeping whenever he pushes the button. After this minute the “Pressure Warning” icon will be shown
continuously. During this whole period, the 3-digit 7-segment section will show nothing.
Additionally the backlight of the display will change to orange/yellow to comply the requirement of
FMVSS 138. After this cycle, the display will be continuously illuminated as long as the malfunction
exists. This alert must be repeated each time the ignition system is switched to the “On” / “Run”
position until the situation causing the malfunction has been corrected.
1.3.7 Measurement frequency
The maximum allowed time between two measurements of pressure and temperature of each tire must
not exceed 3.4 second.
1.4 Contents of display
1.4.1 General notes
The TPMS display must be designed in a way that allows the system to be readable from a distance of
up to 70cm under normal conditions and from a horizontal angle of 120 degrees and a vertical angle of
90 degrees. The display casing must be designed in a way that it allows for easy mounting, thus the
outer dimensions of the housing must be minimized wherever possible.
1.4.2 Display technology
The display must be an LCD display, containing all the required icons and functional fields. The
display must be illuminated by a backlight device. The backlight device must be changeable in its
illumination colour. In order to accommodate for the requirements of the FMVSS 138 for a yellow
colour of the warning symbols and increased visual attraction of warning lights, the display must be
able to display a yellow illuminated warning. This requirement is also deemed fulfilled, if the backlight
colour of the display is changed to yellow in case of an alert 1 situation. In case of an alert 2 situation
the display colour will changed to red (Europe version only). The US version should be activated when
the end consumer will use “psi” and “°F” as units of the measurement fields.