Audi NAVIGATION SYSTEM PLUS Spezifikationen PDF herunterladen (Seite 18)

Basic principles

SSP 199-025

SSP 199-027

SSP 199-026

ABS wheel speed sensor

The wheel speed pulses produced by one of the ABS

wheel speed sensors at the rear axle is used for

measuring the distance travelled by the vehicle. The

navigation control unit receives this data from the ABS

control unit.

Effect of signal failure

The navigation system cannot be started.

Self-diagnosis

The connection to the ABS control unit is monitored.

Switch for reversing lights

The navigation control unit obtains a signal from the

switch for the tail-lights when reverse gear is engaged.

This enables the control unit to distinguish whether the

vehicle is moving forwards or backwards.

Effect of signal failure

The navigation control unit does not recognise when

the vehicle is reversing.

Self-diagnosis

Fault type: No signal

Roof antenna for radio, car phone and navigation

system

Integrated in the roof antenna (Triplex) are the anten-

nas for radio mode, car phone mode and navigation

mode (GPS).

In some Audi vehicles the antennas are positioned

separately.

In these vehicles, the antenna for the navigation system

is located on the bootlid; the antenna for radio recep-

tion in integrated in the rear window and the stub

antenna for the car phone is in the rear left body side

panel.

Self-diagnosis

Fault type: Open circuit, short circuit to earth

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Audi NAVIGATION SYSTEM PLUS Spezifikationen Seite 18