Symptom Duplication When the symptom can be duplicated, verify that it is not a characteristic of the system. Review the navigation manual and compare it to a known-good vehicle (with the same software and database), under the same conditions. If not the same, follow the self-diagnostic procedures 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.
- | Ask the customer to demonstrate the problem.
- | Try to establish possible user error or misunderstanding of the system.
- | Try to establish if outside interference may have been the cause.
- | Try to duplication 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, amps, radar detectors, etc) that may be hidden.