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. Information is presented in the same way as with 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.

The diagnostic tool 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).

Should a fault disappear for any reason after being stored in the control module as a diagnostic trouble code (DTC), the information remains stored 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.

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.
For more information about parameters, see Vehicle communication information in Specifications, other.

Reading off control module identification

The control module can be identified 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).

Calibrating the occupant weight sensor (OWS)

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