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 > Front Power Seat Control System(w/ Memory): Slide Sensor Malfunction (B2650)
DESCRIPTION When the position control ECU and switch assembly does not receive a sensor signal despite forward or rearward movement of the seat by power seat motor operation, this DTC is stored. DTC Code DTC Detection Condition Trouble Area B2650 The forward and rearward lock detection position of t ...
