OPERATION CHECK CHECK LANE DEPARTURE ALERT MAIN SWITCH (a) Check the lane departure alert main switch (steering pad switch assembly) on/off operation. (1) Turn the ignition switch to ON. (2) Confirm that the lane departure alert indicator (green) in the combination meter assembly illuminates or turns off when the lane departure alert main switch (steering pad switch assembly) is pressed. HINT: The ON/OFF status of the lane departure alert system remains unchanged when the ignition switch is turned off and back to ON. 
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Toyota Tundra Service Manual > Meter / Gauge System: Last Communication With Navigation ECU (U0163)
DESCRIPTION The combination meter assembly communicates with the navigation receiver assembly via the CAN line. DTC Code DTC Detection Condition Trouble Area U0163 When either of following conditions is detected: IG voltage 10.5 V or more No communication with navigation receiver assembly continues ...
