Initial Inspection and Diagnostic Overview
On-board diagnostic system (OBD system)
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 two front seat belt buckles diagnostics are carried out by the central electronic module (CEM) which also stores any diagnostic trouble codes (DTC) for them. If the fault is registered for longer than 5 minutes, the central electronic module (CEM) transmits a diagnostic trouble code (DTC) to the SRS module. The SRS module then stores diagnostic trouble codes (DTCs) 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 text in the display
- The general warning lamp lights up in orange 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 diagnostic trouble codes (DTCs)
- Erase diagnostic trouble codes (DTCs) (all DTCs except those stemming from internal faults in the SRS unit can be erased)
- The identity of the SRS system's SRS module and side impact sensors and all installed software can be read off via the VIDA station.
Diagnostic trouble codes (DTCs)
Diagnostic trouble codes (DTCs) are stored by the SRS module's internal diagnostic procedures. The diagnostic trouble codes (DTCs) are defined in the software which is installed in the factory. Diagnostic trouble codes (DTCs) are stored in the event of each diagnosis case automatically carried out by the SRS module or activated by the VIDA station.
