Ford Mustang (1999-2004) Service Manual: Air Bag Supplemental Restraint System (SRS) (Diagnosis and Testing)

Refer to Wiring Diagrams Cell 46 , Air Bag for schematic and connector information.

Special Tool(s)

Diagnostic Tool, Restraint System 418-F088 (105-R0012)

Restraint System Diagnostic Tool Warning

WARNING: This tool is for restraint system service only. Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

Diagnosing Customer Concerns Without Hard DTCs

If a lamp fault code (LFC) is reported by the customer but is not present when the vehicle comes in for service, follow the Diagnostic Instructions procedure in this section to identify the intermittent DTC.

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

• Follow the deactivation procedure in this section.
• Determine the location of components involved in creating that code.
• Perform a thorough visual inspection of:

• components.
• connectors.
• splices and wiring harnesses.
• pinched wires.
• worn insulation on conductors.

Refer to the Possible Causes section of the pinpoint test for the DTC involved, which lists the common concerns that relate to the DTC. Concerns are listed according to priority.

Diagnosing Customer Concerns with Hard DTCs

WARNING: The restraint system diagnostic tool is for restraint system service only.

Remove from vehicle prior to road use. Failure to remove could result in injury and possible violation of vehicle safety standards.

Most air bag supplemental restraint system (SRS) diagnostic procedures will require the use of the deactivation and reactivation procedures in this section.

The deactivation and reactivation require the installation and removal of restraint system diagnostic tools. These procedures require removal of driver air bag module, and the disconnection of the passenger air bag module. This reduces the risk of deployment of air bag modules and safety belt pretensioners while diagnostics are being carried out.

Restraint system diagnostic tools are required to carry out diagnosis and testing of the supplemental restraint system (SRS). It is not acceptable to short-circuit the air bag module connections with a jumper wire. If a jumper wire is used to short-circuit the air bag module connections, a lamp fault code (LFC) will be displayed.

WARNING: The restraint system diagnostic tool is for restraint system service only.

The reactivation procedure requires the removal of any restraint system diagnostic tools installed and the reconnection of any air bag modules disconnected.

• Deactivation Procedure
• Reactivation Procedure