WABCO TAILGUARD, System Description

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Operation Workshop notes
9 .6 Detection of malfunctions
A malfunction is indicated by a red and yellow LED bar flashing or being lit
on the Trailer Remote Control. Additionally, the buzzer of the Trailer Remote
Control signals a beep tone for 3 seconds. TailGUARD is now no longer ready
for operation.
A fault is also present when the Trailer Remote Control provides no feedback at
all by means of colour bars or buzzer when the reverse gear is engaged.
Vehicles with a prepared interface for TailGUARD:
There is no distinction between minor and severe faults in vehicles with a
prepared interface for TailGUARD or which do not have a Trailer Remote
Control installed. The TailGUARD warning lamp is always on when a fault is
present.
If the TailGUARD warning lamp remains activated after the engine is started
and does not go out after its activation test that lasts for 3 seconds, turn the
ignition off and restart the engine immediately (without any delay between
turning on the ignition and starting the engine). If the TailGUARD warning
lamp still fails to go out, check the diagnostic memory of the system using the
WABCO diagnosis.
9 .6 .1 Minor faults
In the case of minor faults, fault messages are only output if the reverse gear is
engaged. You may be able to eliminate the fault yourself:
Detection and warning:
– Visually inspect the ultrasonic sensors.
– If visibly soiled, clean the ultrasonic sensors.
Additionally with "Autonomous braking" option:
– After a longer period of being stationary (with the ignition turned on) drive
ahead a short distance until TailGUARD detects a speed signal.
– Check the system pressure of the braking system in the dashboard.
TailGUARD only operates at pressures above 7.3. bar.
– Wait until there is sufficient pressure in the system before you start driving.
If it is not possible to eliminate the fault with these means, you will need to visit
a workshop, such as a WABCO Service Partner, in the near future. In this case
the system needs to be examined with WABCO system diagnostics (TEBS E).
9 .6 .2 Severe faults
Severe faults are indicated separately if a Trailer Remote Control is installed:
Severe faults are signalled in the same way as minor faults, with the difference
that the fault message occurs even when the reverse gear is not engaged and
that it continues permanently. In this case there is a problem relating to brake
intervention.
The vehicle must be brought to a workshop immediately and with great caution.
In this case the system needs to be examined with WABCO system diagnostics
(TEBS E).