6
TEBS E
GIO functions
110
6.21 Electronic parking brake (with version TEBS E4 or higher)
Vehicle type
All trailers with additional power supply via 24N.
Exception: Special vehicles with external desired-pressure sensor on the CAN
router/repeater.
Purpose
• Prevents the trailer from rolling away if the pneumatic lines are connected in the
wrong order when they are coupled to the towing vehicle.
• Protection against the tractor-trailer combination rolling away if the parking
brake of the towing vehicle of the towing vehicle is not applied while the pneu-
matic lines are coupled.
• Protection against the parked trailer rolling away in the event of accidental or
unauthorised actuation of the release valves on the PREV.
• Protection against trips without ISO 7638 plug connection.
Function
TEBS E detects the uncoupled state. With the help of a pulse-controlled lifting axle
valve and the spring-returned valve, the spring brake cylinders are activated when
the trailer is parked and are only released again when all connections are plugged
in and pressure is detected on the yellow coupling head.
To enable vehicle movement, the pulse-controlled valve is overridden by the
spring-returned valve (on the venting connection of the lifting axle valve) during
coupling. The vehicle can only be moved if the ABS connector is plugged in or the
function has been deactivated via SmartBoard or a button or switch.
Fault indicator / warning lamp: The warning lamp flashes after the ignition is
turned on while the electronic parking brake is still locking the wheels.
Operation: The function operates automatically. In cases where TEBS E can not
detect the coupling, briefly tapping the brake pedal will suffice to release the trailer.
Manoeuvring the vehicle without coupling an electrical connection: It is pos-
sible to temporarily deactivate the electronic parking brake function by means of a
switch/button or the SmartBoard to allow the trailer to be transported onto a ferry at
a later stage, for example. The electronic parking brake must be deactivated before
the ignition is turned off and the trailer uncoupled.
• Deactivation by means of a switch on the GIO port against ground: Open-
ing the switching contact prevents activation of the electronic parking brake.
Closing the switch reactivates the electronic parking brake.
• Deactivation by means of a switch on a GIO port against Plus: Closing the
switching contact prevents activation of the electronic parking brake. Opening
the switch reactivates the electronic parking brake.
• Deactivation by means of a button on the GIO port against ground: Press-
ing the button for a longer period prevents activation of the electronic parking
brake for the next coupling procedure. Briefly pressing the button reactivates
the electronic parking brake.
• SmartBoard: The activity of the electronic parking brake can be switched off for
the next coupling procedure of permanently, provided the parameter settings
permit this.
Emergency function for releasing the electronic parking brake (24N is
plugged in, ISO 7638 is not): Applying the service brake for a longer period with a
pressure greater than 4 bar releases the parking brake. The stop light must remain
switched on for the vehicle to be moved.
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