Volvo Workshop Manuals
XC90 AWD L6-3.2L VIN 98 B6324S (2007)
Relays and Modules > Relays and Modules - Lighting and Horns > Headlamp Control Module > Component Information > Description and Operation > System Overview > Page 1179
Headlamp Control Module: Description and Operation
The control module has a built-in diagnostic system, Volvo Diagnostic, which continuously monitors internal functions as well as input and output
Diagnostic trouble codes (DTCs)
A diagnostic trouble code (DTC) is stored if the control module detects a fault. A fault which is detected in the most recent operating cycle is defined as
Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Reading off input and output signals
This function can be used to continuously read off the status of the control module's input and output signals.
This function can be used to activate components to check that they are working.
Reading off the control module identification
The diagnostic tool identifies control modules by reading off a number of codes from the control module memory.
hardware P/N (control module without software)
hardware serial number (control module without software)
diagnostic software P/N (part of the software).
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