Diagnosing Customer Concerns With On-Demand DTCs

WARNING: This page is about a different car, the 2009 Mercury Grand Marquis and 2009 Ford Crown Victoria. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Most Supplemental Restraint System (SRS) diagnostic procedures will require depowering and repowering of the SRS. Depowering and repowering requires disconnecting of the battery and removal of the Restraints Control Module (RCM) fuse. This reduces the risk of accidental deployment of SRS components while diagnostic procedures are being carried out.

If the air bag warning indicator is reported ON by the customer when the vehicle comes in for service, connect the scan tool and follow the Diagnostic Instruction procedures in this article to identify the concern.

Once the DTC is known, read the Normal Operation of the pinpoint test for the DTC involved.

Using the scan tool with the use of PIDs and active command(s) may be of assistance in diagnosing the concern.

Follow the depowering procedure as directed in Supplemental Restraint System (SRS) Depowering and Repowering .
Determine the location of components involved in creating the DTC.
Carry out a thorough visual inspection of:
- components.
- connectors.
- splices and wiring harnesses.
- insulation on conductors.