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 > Oil Pump: Inspection
INSPECTION PROCEDURE 1. INSPECT OIL PUMP RELIEF VALVE (a) Coat the relief valve with engine oil. (b) Check that the relief valve falls smoothly into the valve hole by its own weight. If the relief valve is not as specified, replace it. If necessary, replace the timing chain cover sub-assembly. 2. IN ...
