Diagnostic Functions

Diagnostic functions

General




The on-board diagnostic (OBD) system for the supplemental restraint system module (SRS) continually diagnoses the function of supplemental restraint system components and stores any diagnostic trouble codes (DTCs). 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 supplemental restraint 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 general warning lamp lights up in orange and there is 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 trouble codes (DTCs)
The control module will store a diagnostic trouble code (DTC) if it detects a fault. The control module can store up to 10 diagnostic trouble codes (DTCs).
If a fault disappears for any reason after the diagnostic trouble code (DTC) has been stored in the control module, information about the fault remains 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.
After the diagnostic trouble code (DTC) is stored it can also be read off if the fault is still present (permanent fault), or if the fault has disappeared for any reason (intermittent fault).
Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once.

Data read-out
Data can be read off from the supplemental restraint system module (SRS) using this function.

Car model
Reads off the model that is programmed into the control module.

Steering
Read off whether the supplemental restraint system module (SRS) is programmed for left or right-hand drive.

Passenger airbag
Read off the configuration that is programmed into the supplemental restraint system module (SRS), with or without passenger airbag.

Front seat belt buckle
Reads off the status of the driver and passenger seatbelt buckles.

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 information about the control module's:
- hardware P/N (control modules without software)
- hardware serial number (control modules without software)
- side impact sensor serial number
- software P/N
- P/N diagnostic software.