Diagnostic functions

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2006 Volvo S80, 2005 Volvo S80, 2004 Volvo S80, 2003 Volvo S80, and 2002 Volvo S80. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying On-Board Diagnostic System And CEM

Courtesy of VOLVO CARS OF NORTH AMERICA.

General

The on-board diagnostic (OBD) system for the SRS continually diagnoses the function of SRS system components and stores any diagnostic trouble codes (DTCs). However, the diagnostics for the two front seat belt buckles are carried out by the central electronic module (CEM) which also stores any diagnostic trouble codes (DTC) for them. If a fault is registered for longer than 5 minutes, the central electronic module (CEM) transmits the diagnostic trouble code (DTC) to the SRS control module. The SRS module then stores diagnostic trouble code(s) (DTC) for the front seat belt buckles. The diagnostic trouble codes (DTCs) can then be read off via VIDA. The principle behind VIDA information presentation is the same as for other on-board diagnostic (OBD) systems.

Fault indication

The driver is warned in a number of ways via the combined instrument panel if any fault occurs in the SRS system:

SRS warning lamp and text in the display
The general warning lamp lights up in red and there is text in the display
The orange general warning lamp and text in the display.

A VIDA station must be connected to the car data link connector (DLC) in order for a fault source to be identified.

Diagnostic services

The following diagnostic services are available for the SRS system:

Read off diagnostic trouble codes (DTCs) (maximum of 5 codes)
Erase diagnostic trouble codes (DTCs) (all DTCs except those stemming from internal faults in the SRS control module can be erased)
The identity of the SRS control module. The software that is installed can be read off via the VIDA station.