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 > Driver Side Knee Airbag Assembly: On-vehicle Inspection
ON-VEHICLE INSPECTION PROCEDURE 1. CHECK LOWER NO. 1 INSTRUMENT PANEL AIRBAG ASSEMBLY (VEHICLE NOT INVOLVED IN COLLISION) (a) Perform a diagnostic system check (See page ). (b) With the lower No. 1 instrument panel airbag installed on the vehicle, perform a visual check. If there are any defects as ...
