Diagnosing Customer Concerns With Hard Fault Codes

Most air bag Supplemental Restraint System (SRS) diagnostic procedures will require the use of the deactivation and reactivation procedures.

The deactivation procedure requires the removal of the driver air bag and the disconnection of the passenger air bag. Air bag simulators are attached to the vehicle harness at the air bag sliding contact and at the electrical connectors for the passenger air bag and the two side air bags. This procedure removes the risk of air bag deployment while diagnostics are carried out.





Air bag simulators are required to carry out diagnosis and testing of the SRS. The air bag simulator is a 2-ohm resistor used to simulate air bag module connections to the system. It is not acceptable to short-circuit the air bag module connections with a zero-ohm jumper wire. If a zero-ohm jumper wire is used to short-circuit the air bag module connections, a Lamp Fault Code (LFC) will be displayed.

The reactivation procedure requires the removal of any air bag simulators installed and the reinstallation and reconnection of any air bag modules removed or disconnected.