XC70 AWD L6-3.2L VIN 98 B6324S (2009)
Accessory Control Display: Description and Operation
System Overview
System overview
control module
S80/V70/XC70
XC60
The most important task of the High Level Display Front (HLDF) is to present multimedia information, system settings and navigation information.
The control module is located in the middle of the dashboard. For the XC60, the control module is located in the center console. At replacement, the
entire control module is removed from the vehicle.
High Level Display Front (HLDF) communicates both with the directly connected components, and with other control modules via CAN
communication.
The control module checks its calculations and all activations made, and input and output signals through integrated diagnostics. A Diagnostic trouble
code (DTC) is stored when the control module detects a fault. In certain cases the faulty signal is replaced by a substitute value. Any Diagnostic trouble
codes (DTCs) are stored in the control module memory. The information can be read off using a diagnostic tool.
A diagnostic trouble code is stored in the control module's internal memory if the control module detects a fault. At the same time a number of values
which occurred the moment that the fault occurred are frozen. Depending on how serious the fault is certain faults will be fully or partially disconnected.
Diagnostic trouble codes (DTCs) and frozen values (extended fault code information) can be read off using the diagnostic tool via the data link
connector (DLC) in the vehicle.
Activate ignition position II to check if the High Level Display Front (HLDF) is supplied with voltage and grounded. If the screen rises up then the High
Level Display Front (HLDF) is supplied with voltage. This does not apply to the XC60 as there is no raising function.
For further information, also see Signal specifications.
Signals
The table below summarizes the input signals to and output signals from the High Level Display Front (HLDF). The signal types are divided into directly
connected signals and CAN communication. The illustration below displays the same information with the Volvo component designations.
