| Information required from customer in the event of complaints |
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| Which navigation system function is causing problems? |
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| Has customer complied with navigation system operating instructions? |
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| Which messages appeared on display? Evaluation of messages → Chapter |
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| Have objects possibly been transported on roof? Possible sources of interference in or on vehicle → Chapter |
| t
| Are magnetic/metallic components regularly transported in the vehicle? Possible sources of interference in or on vehicle → Chapter |
| t
| Possible exposure to external sources of interference? → Chapter. |
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