SYSTEM DIAGRAM 
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Toyota Avalon Service & Repair Manual > Navigation System(for Gasoline Model): Extension Module Disconnected 2 (B1543)
DESCRIPTION If the radio and display receiver assembly cannot detect the navigation ECU for a certain period of time (90 seconds) after the engine switch is turned on (ACC) and the radio and display receiver assembly confirms that the information is missing by checking past navigation ECU recognitio ...
