Compound Navigation

Compound Navigation

General Information and Components

Compound navigation consists of the navigation control module with a gyro module, the navigation system antenna (R50), the ABS control module (J104), and the front ABS wheel speed sensors (G45, G47). Compound navigation makes navigation possible when a GPS signal is temporarily not available.

• AWD vehicles have two extra sensors, the right rear ABS wheel speed sensor (G44) and the left rear ABS wheel speed sensor (G46).

Function

Audi navigation systems use the number of pulses from the speed sensors for compound navigation. The number of pulses from the front axle is calculated by the ABS control module based on the signals from the front ABS wheel speed sensors and then sent to the combi/chassis-CAN. The data bus on board diagnostic interface (J533) reads the data from the combi/chassis-CAN and then sends it to the navigation control module using the MOST-bus. The navigation control module contains a gyro module that recognizes turning movements and changes in the drive direction. Both values, speed and turning, make up the compound navigation.

Service Information

There must be a GPS signal present when starting navigation in order to determine the location of the vehicle. Compound navigation is not possible if the vehicle location was not determined beforehand by satellite navigation.

Information regarding the necessary components can be read in the following measured value blocks in the navigation control module:






Audi vehicles which are equipped with a navigation system will use the system whenever possible.