HOW TO PROCEED WITH TROUBLESHOOTING HINT: This is a flowchart for vehicle pull. 
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Toyota Tundra Service Manual > Can Communication System: Navigation ECU Communication Stop Mode
DESCRIPTION Detection Condition Symptoms Trouble Area Navigation ECU Communication Stop Mode Any of the following conditions are met: Communication stop for "Display and Navigation (AVN)" is indicated on the "Communication Bus Check" screen of the Techstream. Communication system DTCs (DTCs that sta ...
