WABCO TAILGUARD, Manual

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A GIO cable, with which the ECU taps the power supply for the reversing light. This enables the system to
detect when reverse gear is engaged, so that it then activates the monitoring of the area behind the vehicle with
TailGUARD™.
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A diagnostic socket. This is installed in an easily accessible position outside of the vehicle and is connected to
the ECU with its cable. The diagnostic socket is used for configuring the system's parameters and putting it into
operation, as well as for diagnosing malfunctions.
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Additional optional components, such as a monitoring off-switch, an extra buzzer and indicator lamps, can be
connected to additional GIO sockets in the ECU.
5.2 Variant: Autonomous braking via separate valves
With this variant, the following line links are required in addition to the preceding variant:
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A cable via which the ECU receives the vehicle speed signal. This cable is routed either directly to the vehicle
tachograph, or to an interface provided by the vehicle manufacturer in accordance with ISO 16844-2 ("C3 signal",
also called a "B7 signal"). The other cable wires are not used and must be isolated. The speed signal is required by
the ECU in order to be able to match the applied braking pressure to the actual speed of the vehicle.
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Other wires of the universal cable (which is only used with the first variant for tapping the power supply to
the reversing light) are used to connect the two stop lights so that they can be supplied with power during an
autonomous braking action.
Which additional valves, sensors and line links have to be installed so that an autonomous braking action can be
executed when approaching an object behind the vehicle will depend upon the braking system of the vehicle in
question. This is how the system functions on vehicles equipped with an ABS braking system:
Required components: Overview