Diagnostic Functions

Diagnostic functions

General




The diagnostic system for the supplemental restraint system (SRS) continually diagnoses the function of supplemental restraint system (SRS) components and stores any diagnostic trouble codes (DTCs). Diagnostic trouble codes can be read via VIDA. Information is presented in VIDA in a manner similar to that of other diagnostic systems.

Fault indication
If a fault occurs in the SRS system the driver is warned in various ways via the combined instrument panel:
- the SRS indicator lamp lights up and text appears in the display
- the general warning lamp lights and text appears in the display
- the yellow information lamp lights and text appears in the display.
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 20 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 out and erasing diagnostic trouble codes
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 supplemental restraint system module (SRS) using this function.
Front seat belt buckle
Reads off the status of the driver and passenger seatbelt buckles.
Passenger airbag
Reads off the status of the passenger airbag.
PAD lamp
Reads off the status of the PAD lamp.
Battery voltage
Reads off the level of the power supply to the control module.

Reading off control module identification
VIDA identifies control modules by reading off a number of codes from the control module memory. The codes contain information about the control module:
- hardware P/N (control module without software)
- hardware serial number (control module without software)
- software P/N
- software number, diagnostics.
The following information can also be read off from the control module memory:
- serial number, front impact sensor
- serial number, side impact sensor
- serial number of the occupant weight sensor (OWS) (USA/CDN only)
- serial number of the seat belt (inertia) reels (USA/CDN only).

Calibrating occupant weight sensor (OWS)
The occupant weight sensor (OWS) can be calibrated using this function.