PROCEDURE
(a) Check that conditions in the cabin are not likely to cause condensation. HINT: This problem occurs when the cabin is humid and the temperature changes rapidly. This may produce condensation, resulting in a short circuit. OK: Condensation is not likely to be produced.
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Toyota Tundra Service Manual > Navigation System: Navigation Voice Circuit
DESCRIPTION This circuit is used when the voice guidance in the navigation system is on or an incoming cellular phone voice in the "Bluetooth" hands-free system is heard. Using this circuit, the navigation receiver assembly sends the signals to the stereo component amplifier assembly. WIRING DIAGRAM ...