ON-VEHICLE INSPECTION PROCEDURE 1. INSPECT REAR BODY TAIL GATE ASSEMBLY (a) Check that the clearance measurements of areas A to B are within the standard range. 
Standard measurement:
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Toyota Tundra Service Manual > Navigation System: AVC-LAN Circuit
DESCRIPTION Each unit of the navigation system connected to the AVC-LAN (communication bus) transfers the switch signals using the AVC-LAN. If a short to +B or short to ground occurs in the AVC-LAN, the navigation system will not function normally because communication is not possible. WIRING DIAGRA ...
