V50 L5-2.4L VIN 39 B5244S7 (2005)
Trailer Lighting 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
signals. The control module stores any diagnostic trouble codes (DTCs). The diagnostic trouble codes (DTCs) can then be read using VIDA. Information
is presented in VIDA in the same way as with other diagnostic systems.
If a fault arises in the tow hitch system the driver is warned via the driver information module (DIM) when the information lamp lights and an alert
message is displayed.
A VIDA station must be connected to the data link connector (DLC) in order to identify the source of the fault.
Diagnostic trouble codes (DTCs)
A diagnostic trouble code (DTC) is stored if the control module detects a fault. The control module can store up to 8 diagnostic trouble codes (DTCs).
Diagnostic trouble codes (DTCs) for different types of short-circuit are only stored when there is no tow hitch connector connected to the socket. This is
so that diagnostic trouble codes (DTCs) are not stored in the event of a fault in the trailer's cable harness or its connectors.
Should a fault disappear for any reason after being stored in the control module as a diagnostic trouble code (DTC), the information remains stored in the
control module. If a fault is no longer permanent, the diagnostic trouble code (DTC) remains as intermittent.
Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
This function can also be used to read off whether the fault is still present (permanent) or whether it has now ceased (intermittent) after the diagnostic
trouble code (DTC) has been stored.
Diagnostic trouble codes (DTCs) can only be erased once all the diagnostic trouble codes (DTCs) have been read off at least once.
Reading off the parameters
Data can be read off from the trailer module (TRM) using this function.
Reads off the level of the power supply to the control module.
Reads out the status of the stop lamp signal from the vehicle's right tail lamp.
Reads out the status of the output signals to the cable harness for the tow hitch.