Symptom Diagnosis

Symptom Diagnosis
Certain circumstances and system limitations will result in occasional vehicle positioning errors. Some customers may think this indicates a problem with the navigation system when, in fact, the system is normal. Keep the "System Limitations" System Limitations items in mind when interviewing customers about navigation system symptoms.

Symptom Duplication
When the symptom can be duplicated, follow the self-diagnostic procedures (picture diagnosis mode) 2. Picture Diagnosis Mode and the appropriate troubleshooting procedures.

When the symptom does not reappear or only reappears intermittently, ask the customer about the conditions when the symptom occurred.
C. Symptom Diagnostic Procedures

Try to establish if outside interference may have been the cause.

Try to duplicate the symptom under the same conditions the customer was experiencing.

Vibration, temperature extremes, and moisture (dew, humidity) are factors that are difficult to duplicate.

Inspect the vehicle for after-market electronic devices (vehicle locators, amp, etc) that may be hidden.