Diagnosing Customer Concerns w/out Hard Fault Codes

If a diagnostic trouble code is reported by the customer but is not present when the vehicle comes in for service, pinpoint diagnostics cannot be used. The air bag diagnostic monitor does not contain any memory of the diagnostic trouble code after the key is turned OFF. If the diagnostic trouble code is unknown, instruct the customer on how to count a code. Demonstrate a diagnostic trouble code by disconnecting an air bag sensor, turn the key to the ON position, and allow the customer to count the diagnostic trouble code. Reconnect the air bag sensor and instruct customer to return when the code is known. Once the code is known, read the "Normal Operation" information in the Pinpoint Test for the diagnostic trouble code involved. Study the circuit diagram and determine the location of components that are involved in creating that diagnostic trouble code. Do a thorough visual inspection of components, connectors, splices and wiring harnesses, looking for pinched wires, worn insulation on conductors, opens, shorts, or loosely mounted air bag sensors. The "Possible Causes" information in the applicable Pinpoint Test lists the common concerns that relate to each diagnostic trouble code. Concerns are listed in the order that they are most likely to occur.

NOTE: Following the pinpoint tests or fault tree diagnosis when the code is not flashing will result in needless replacement of the air bag system components and repeat service.