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 > Power Tilt And Power Telescopic Steering Column System: Tilt and Telescopic Manual Switch Circuit Malfunction (B2603)
DESCRIPTION Different voltage values are sent to the multiplex tilt and telescopic ECU by operating the tilt and telescopic switch (headlight dimmer switch assembly). The multiplex tilt and telescopic ECU then judges which motor and in which direction that motor should operate based on the voltage v ...
