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It is well known that the Tianjin FAW Toyota Auto Body Co produced a DVD voice navigation system on the GLX-i model, which is composed of DVD, navigation ECU, GPS antenna and display and display machine with a display screen. Since there were few cars equipped with navigation system in the domestic market, the maintenance personnel had little experience in maintaining the navigation system malfunction. In order to facilitate the maintenance of the general malfunction of the vehicle navigation system for the majority of the maintenance personnel, the author will introduce some of the faults of the vehicle navigation system to the broad colleagues in the past 2 years. Here, 2 cases are introduced, and we hope to be helpful to all of us.