Diagnostic Functions

Diagnostic Functions For The Brake Control Module

General







The control module has a built-in diagnostic system, the Volvo on-board diagnostic (OBD) system. This system continuously monitors its own system and the input and output signals.

Diagnostic trouble codes (DTCs)
The control module will store a diagnostic trouble code (DTC) if it detects a fault. A fault which is detected in the latest driving cycle is defined as permanent. Other faults are defined as intermittent. An operating cycle involves ignition on, the vehicle speed exceeding 10 km/h (20 km/h with B8444S engine) and the ignition being switched off.

Reading and erasing diagnostic trouble codes (DTCs)
Stored diagnostic trouble codes (DTCs) can be read off and erased using this function.
Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once.

Reading off input and output signals
Using this function, the status of the control module input and output signals can be continuously read off.

Activating components
This function allows components to be activated so that their functions can be checked.

Reading off the control module identification
VIDA identifies the control modules by reading off a number of codes from the control module memory.
The codes contain the following information about the control module:
- hardware P/N (control modules without software)
- hardware serial number (control modules without software)
- software P/N
- diagnostic software P/N (part of the software).